From 4782a9ec74718fa10c66f95fd0341f09386aac71 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 31 Mar 2026 12:40:55 +0200
Subject: [PATCH 01/49] [render] add CrossSectionUniforms class

---
 .../uniforms/cross_section_uniforms.h         | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h

diff --git a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
new file mode 100644
index 0000000000..438f17390b
--- /dev/null
+++ b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
@@ -0,0 +1,84 @@
+/*****************************************************************************
+ * VCLib                                                                     *
+ * Visual Computing Library                                                  *
+ *                                                                           *
+ * Copyright(C) 2021-2026                                                    *
+ * Visual Computing Lab                                                      *
+ * ISTI - Italian National Research Council                                  *
+ *                                                                           *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the Mozilla Public License Version 2.0 as published *
+ * by the Mozilla Foundation; either version 2 of the License, or            *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program is distributed in the hope that it will be useful,           *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
+ * Mozilla Public License Version 2.0                                        *
+ * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
+ ****************************************************************************/
+
+#ifndef VCL_BGFX_DRAWABLE_UNIFORMS_CROSS_SECTION_UNIFORMS_H
+#define VCL_BGFX_DRAWABLE_UNIFORMS_CROSS_SECTION_UNIFORMS_H
+
+#include <vclib/bgfx/uniform.h>
+
+#include <vclib/space/core.h>
+
+namespace vcl {
+
+class CrossSectionUniforms
+{
+    inline static std::array<float, 4> sCrossSectionMinData = {
+        Point3f::min().x(), // x min
+        Point3f::min().y(), // y min
+        Point3f::min().z(), // z min
+        0.0                 // unused
+    };
+
+    inline static std::array<float, 4> sCrossSectionMaxData = {
+        Point3f::max().x(), // x max
+        Point3f::max().y(), // y max
+        Point3f::max().z(), // z max
+        0.0                 // unused
+    };
+
+    inline static Uniform sCrossSectionMinDataUniform;
+    inline static Uniform sCrossSectionMaxDataUniform;
+
+public:
+    CrossSectionUniforms() = delete;
+
+    static void set(
+        const Point3f& minPoint = Point3f::min(),
+        const Point3f& maxPoint = Point3f::max())
+    {
+        sCrossSectionMinData[0] = minPoint.x();
+        sCrossSectionMinData[1] = minPoint.y();
+        sCrossSectionMinData[2] = minPoint.z();
+
+        sCrossSectionMaxData[0] = maxPoint.x();
+        sCrossSectionMaxData[1] = maxPoint.y();
+        sCrossSectionMaxData[2] = maxPoint.z();
+    }
+
+    static void bind()
+    {
+        // lazy initialization
+        // to avoid creating uniforms before bgfx is initialized
+        if (!sCrossSectionMinDataUniform.isValid())
+            sCrossSectionMinDataUniform =
+                Uniform("u_crossSectionMinData", bgfx::UniformType::Vec4);
+        if (!sCrossSectionMaxDataUniform.isValid())
+            sCrossSectionMaxDataUniform =
+                Uniform("u_crossSectionMaxData", bgfx::UniformType::Vec4);
+        sCrossSectionMinDataUniform.bind(sCrossSectionMinData.data());
+        sCrossSectionMaxDataUniform.bind(sCrossSectionMaxData.data());
+    }
+};
+
+} // namespace vcl
+
+#endif // VCL_BGFX_DRAWABLE_UNIFORMS_CROSS_SECTION_UNIFORMS_H

From 73726c76378c5d9bbf467fcb8b482b6fb47dfe6d Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 31 Mar 2026 12:57:27 +0200
Subject: [PATCH 02/49] [render] add CrossSectionUniforms shader header

---
 .../uniforms/cross_section_uniforms.sh        | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh b/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
new file mode 100644
index 0000000000..861606d960
--- /dev/null
+++ b/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
@@ -0,0 +1,37 @@
+/*****************************************************************************
+ * VCLib                                                                     *
+ * Visual Computing Library                                                  *
+ *                                                                           *
+ * Copyright(C) 2021-2026                                                    *
+ * Visual Computing Lab                                                      *
+ * ISTI - Italian National Research Council                                  *
+ *                                                                           *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the Mozilla Public License Version 2.0 as published *
+ * by the Mozilla Foundation; either version 2 of the License, or            *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program is distributed in the hope that it will be useful,           *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
+ * Mozilla Public License Version 2.0                                        *
+ * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
+ ****************************************************************************/
+
+#ifndef VCL_EXT_BGFX_UNIFORMS_CROSS_SECTION_UNIFORMS_SH
+#define VCL_EXT_BGFX_UNIFORMS_CROSS_SECTION_UNIFORMS_SH
+
+uniform vec4 u_crossSectionMinData;
+uniform vec4 u_crossSectionMaxData;
+
+#define u_crossSectionMinX u_crossSectionMinData.x
+#define u_crossSectionMinY u_crossSectionMinData.y
+#define u_crossSectionMinZ u_crossSectionMinData.z
+
+#define u_crossSectionMaxX u_crossSectionMaxData.x
+#define u_crossSectionMaxY u_crossSectionMaxData.y
+#define u_crossSectionMaxZ u_crossSectionMaxData.z
+
+#endif // VCL_EXT_BGFX_UNIFORMS_CROSS_SECTION_UNIFORMS_SH

From 45d28b31b5be8e9e449fb518e9bd5a61b47ad912 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 31 Mar 2026 12:57:43 +0200
Subject: [PATCH 03/49] [render] Add cross-section uniforms and controls to
 drawable mesh classes

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  | 11 ++++++++
 .../render/drawable/abstract_drawable_mesh.h  | 25 +++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index fda0270da6..36a4e5af69 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -29,6 +29,7 @@
 #include <vclib/bgfx/context.h>
 #include <vclib/bgfx/drawable/drawable_environment.h>
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers.h>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.h>
 #include <vclib/bgfx/drawable/uniforms/mesh_render_settings_uniforms.h>
 
 #include <bgfx/bgfx.h>
@@ -216,6 +217,16 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         DrawableMeshUniforms::setColor(*this);
         MeshRenderSettingsUniforms::set(mMRS);
 
+        if (AbstractDrawableMesh::mCrossSectionEnabled) {
+            CrossSectionUniforms::set(
+                AbstractDrawableMesh::mCrossSectionMin,
+                AbstractDrawableMesh::mCrossSectionMax);
+        }
+        else {
+            CrossSectionUniforms::set();
+        }
+        CrossSectionUniforms::bind();
+
         if (mMRS.isSurface(MRI::Surface::VISIBLE)) {
             const PBRViewerSettings&   pbrSettings = settings.pbrSettings;
             const DrawableEnvironment* env         = settings.environment;
diff --git a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
index e2d921334c..af8cc356c9 100644
--- a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
+++ b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
@@ -46,6 +46,11 @@ class AbstractDrawableMesh : public vcl::DrawableObject
 
     Box3d mBoundingBox;
 
+    bool mCrossSectionEnabled = false;
+
+    Point3f mCrossSectionMin = Point3f::min();
+    Point3f mCrossSectionMax = Point3f::max();
+
 public:
     using MatIt = std::vector<Material>::const_iterator;
 
@@ -60,6 +65,23 @@ class AbstractDrawableMesh : public vcl::DrawableObject
 
     const MeshRenderSettings& renderSettings() const { return mMRS; }
 
+    bool isCrossSectionEnabled() const { return mCrossSectionEnabled; }
+
+    void setCrossSectionEnabled(bool enabled)
+    {
+        mCrossSectionEnabled = enabled;
+    }
+
+    void setCrossSectionMin(const Point3f& minPoint)
+    {
+        mCrossSectionMin = minPoint;
+    }
+
+    void setCrossSectionMax(const Point3f& maxPoint)
+    {
+        mCrossSectionMax = maxPoint;
+    }
+
     virtual void updateBuffers(
         MeshRenderInfo::BuffersBitSet buffersToUpdate =
             MeshRenderInfo::BUFFERS_ALL) = 0;
@@ -96,6 +118,9 @@ class AbstractDrawableMesh : public vcl::DrawableObject
         vcl::DrawableObject::swap(other);
         swap(mMRS, other.mMRS);
         swap(mBoundingBox, other.mBoundingBox);
+        swap(mCrossSectionEnabled, other.mCrossSectionEnabled);
+        swap(mCrossSectionMin, other.mCrossSectionMin);
+        swap(mCrossSectionMax, other.mCrossSectionMax);
     }
 
     // if the mesh does not have a bounding box, or if it has it but it is

From 9409624efa5b2396873875bc121b98c0680638de Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 31 Mar 2026 15:26:40 +0200
Subject: [PATCH 04/49] [render] per vertex and per fragment cross section

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h    |  6 ++++--
 .../drawable/uniforms/cross_section_uniforms.h  |  4 +++-
 .../render/drawable/abstract_drawable_mesh.h    | 17 ++++++++++++-----
 .../drawable/uniforms/cross_section_uniforms.sh |  2 ++
 4 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index 36a4e5af69..47f0b32cc2 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -217,10 +217,12 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         DrawableMeshUniforms::setColor(*this);
         MeshRenderSettingsUniforms::set(mMRS);
 
-        if (AbstractDrawableMesh::mCrossSectionEnabled) {
+        if (AbstractDrawableMesh::isCrossSectionEnabled()) {
+            using enum AbstractDrawableMesh::CrossSectionType;
             CrossSectionUniforms::set(
                 AbstractDrawableMesh::mCrossSectionMin,
-                AbstractDrawableMesh::mCrossSectionMax);
+                AbstractDrawableMesh::mCrossSectionMax,
+                AbstractDrawableMesh::mCrossSectionType == PER_FRAGMENT);
         }
         else {
             CrossSectionUniforms::set();
diff --git a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
index 438f17390b..c2b4217cec 100644
--- a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
+++ b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
@@ -53,11 +53,13 @@ class CrossSectionUniforms
 
     static void set(
         const Point3f& minPoint = Point3f::min(),
-        const Point3f& maxPoint = Point3f::max())
+        const Point3f& maxPoint = Point3f::max(),
+        bool perFragment = false)
     {
         sCrossSectionMinData[0] = minPoint.x();
         sCrossSectionMinData[1] = minPoint.y();
         sCrossSectionMinData[2] = minPoint.z();
+        sCrossSectionMinData[3] = float(perFragment);
 
         sCrossSectionMaxData[0] = maxPoint.x();
         sCrossSectionMaxData[1] = maxPoint.y();
diff --git a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
index af8cc356c9..e1bc4160d0 100644
--- a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
+++ b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
@@ -39,6 +39,10 @@ namespace vcl {
  */
 class AbstractDrawableMesh : public vcl::DrawableObject
 {
+public:
+    enum class CrossSectionType { NONE, PER_VERTEX, PER_FRAGMENT };
+
+private:
     inline static const Image EMPTY_IMAGE;
 
 protected:
@@ -46,7 +50,7 @@ class AbstractDrawableMesh : public vcl::DrawableObject
 
     Box3d mBoundingBox;
 
-    bool mCrossSectionEnabled = false;
+    CrossSectionType mCrossSectionType = CrossSectionType::NONE;
 
     Point3f mCrossSectionMin = Point3f::min();
     Point3f mCrossSectionMax = Point3f::max();
@@ -65,11 +69,14 @@ class AbstractDrawableMesh : public vcl::DrawableObject
 
     const MeshRenderSettings& renderSettings() const { return mMRS; }
 
-    bool isCrossSectionEnabled() const { return mCrossSectionEnabled; }
+    bool isCrossSectionEnabled() const
+    {
+        return mCrossSectionType != CrossSectionType::NONE;
+    }
 
-    void setCrossSectionEnabled(bool enabled)
+    void setCrossSectionType(CrossSectionType type)
     {
-        mCrossSectionEnabled = enabled;
+        mCrossSectionType = type;
     }
 
     void setCrossSectionMin(const Point3f& minPoint)
@@ -118,7 +125,7 @@ class AbstractDrawableMesh : public vcl::DrawableObject
         vcl::DrawableObject::swap(other);
         swap(mMRS, other.mMRS);
         swap(mBoundingBox, other.mBoundingBox);
-        swap(mCrossSectionEnabled, other.mCrossSectionEnabled);
+        swap(mCrossSectionType, other.mCrossSectionType);
         swap(mCrossSectionMin, other.mCrossSectionMin);
         swap(mCrossSectionMax, other.mCrossSectionMax);
     }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh b/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
index 861606d960..ce08426eda 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
@@ -26,6 +26,8 @@
 uniform vec4 u_crossSectionMinData;
 uniform vec4 u_crossSectionMaxData;
 
+#define u_crossSectionPerFragment bool(u_crossSectionMinData.w != 0.0)
+
 #define u_crossSectionMinX u_crossSectionMinData.x
 #define u_crossSectionMinY u_crossSectionMinData.y
 #define u_crossSectionMinZ u_crossSectionMinData.z

From 9207f49559d5697818fe1e979f5b95adb119dff2 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 31 Mar 2026 15:27:03 +0200
Subject: [PATCH 05/49] [render] implement cross section for drawable mesh
 surface

---
 .../drawable_mesh/surface/fs_surface_uber.sc     | 15 ++++++++++++++-
 .../drawable_mesh/surface/varying.def.sc         | 14 ++++++++------
 .../drawable/drawable_mesh/surface/vs_surface.sc | 16 +++++++++++++++-
 3 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
index aa1c617415..491962e84b 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
@@ -20,10 +20,11 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/drawable_mesh_texture_uniforms.sh>
 
 #define primitiveID (u_firstChunkPrimitiveID + gl_PrimitiveID)
@@ -33,6 +34,18 @@ BUFFER_RO(primitiveNormals, float, VCL_MRB_PRIMITIVE_NORMAL_BUFFER); // normal o
 
 void main()
 {
+    if (v_discardFlag > 0.0001) { // if vertex is marked as discard, discard the fragment
+        discard;
+    }
+
+    // discard the fragment if it is outside the cross-section box
+    if (v_worldPos.x < u_crossSectionMinX || v_worldPos.x > u_crossSectionMaxX ||
+            v_worldPos.y < u_crossSectionMinY || v_worldPos.y > u_crossSectionMaxY ||
+            v_worldPos.z < u_crossSectionMinZ || v_worldPos.z > u_crossSectionMaxZ)
+    {
+        discard;
+    }
+
     // depth offset - avoid z-fighting
     float depthOffset = 0.0;
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
index a369f1cdc6..c31ee4f3fc 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
@@ -5,9 +5,11 @@ vec4 a_color0    : COLOR0;
 vec2 a_texcoord0 : TEXCOORD0;
 vec2 a_texcoord1 : TEXCOORD1;
 
-vec3 v_position  : TEXCOORD2; // unused texcoord semantic
-vec3 v_normal    : NORMAL;
-vec4 v_tangent   : TANGENT;
-vec4 v_color     : COLOR0;
-vec2 v_texcoord0 : TEXCOORD0;
-vec2 v_texcoord1 : TEXCOORD1;
+vec3 v_position     : TEXCOORD2; // unused texcoord semantic
+vec3 v_worldPos     : TEXCOORD3; // unused texcoord semantic
+float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+vec3 v_normal       : NORMAL;
+vec4 v_tangent      : TANGENT;
+vec4 v_color        : COLOR0;
+vec2 v_texcoord0    : TEXCOORD0;
+vec2 v_texcoord1    : TEXCOORD1;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
index 2ff4babf63..d54570be1d 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
@@ -21,14 +21,16 @@
  ****************************************************************************/
 
 $input a_position, a_normal, a_tangent, a_color0, a_texcoord0, a_texcoord1
-$output v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$output v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
     gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
     v_position = mul(u_modelView, vec4(a_position, 1.0)).xyz;
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     v_normal = normalize(mul(u_normalMatrix, a_normal));
     v_texcoord0 = a_texcoord0;
     v_texcoord1 = a_texcoord1;
@@ -37,4 +39,16 @@ void main()
 
     // default case - color is taken from buffer
     v_color = a_color0;
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    if (!u_crossSectionPerFragment) {
+        bool isOutside = v_worldPos.x < u_crossSectionMinX || v_worldPos.x > u_crossSectionMaxX ||
+            v_worldPos.y < u_crossSectionMinY || v_worldPos.y > u_crossSectionMaxY ||
+            v_worldPos.z < u_crossSectionMinZ || v_worldPos.z > u_crossSectionMaxZ;
+
+        v_discardFlag = isOutside ? 1.0 : 0.0;
+    }
+    else {
+        v_discardFlag = 0.0; // no discard
+    }
 }

From 16622eb27f7692ed86ae02afb318dcd657dc2ee5 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 1 Apr 2026 16:25:32 +0200
Subject: [PATCH 06/49] [render] Refactor cross section settings into
 CrossSectionSettings class and UI

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  |  10 +-
 .../render/drawable/abstract_drawable_mesh.h  |  32 ++----
 .../drawable/mesh/cross_section_settings.h    | 101 ++++++++++++++++++
 .../qt/gui/mesh_render_settings_frame.ui      |  86 ++++++++++++---
 4 files changed, 186 insertions(+), 43 deletions(-)
 create mode 100644 vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index 47f0b32cc2..e975d4beed 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -217,12 +217,12 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         DrawableMeshUniforms::setColor(*this);
         MeshRenderSettingsUniforms::set(mMRS);
 
-        if (AbstractDrawableMesh::isCrossSectionEnabled()) {
-            using enum AbstractDrawableMesh::CrossSectionType;
+        if (AbstractDrawableMesh::mCSS.isEnabled()) {
+            using enum CrossSectionSettings::CrossSectionType;
             CrossSectionUniforms::set(
-                AbstractDrawableMesh::mCrossSectionMin,
-                AbstractDrawableMesh::mCrossSectionMax,
-                AbstractDrawableMesh::mCrossSectionType == PER_FRAGMENT);
+                AbstractDrawableMesh::mCSS.lower(),
+                AbstractDrawableMesh::mCSS.upper(),
+                AbstractDrawableMesh::mCSS.type() == PER_FRAGMENT);
         }
         else {
             CrossSectionUniforms::set();
diff --git a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
index e1bc4160d0..77644a5c78 100644
--- a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
+++ b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
@@ -24,6 +24,7 @@
 #define VCL_RENDER_DRAWABLE_ABSTRACT_DRAWABLE_MESH_H
 
 #include "drawable_object.h"
+#include "mesh/cross_section_settings.h"
 #include "mesh/mesh_render_settings.h"
 
 #include <vclib/space/core/matrix.h>
@@ -47,14 +48,10 @@ class AbstractDrawableMesh : public vcl::DrawableObject
 
 protected:
     MeshRenderSettings mMRS;
+    CrossSectionSettings mCSS;
 
     Box3d mBoundingBox;
 
-    CrossSectionType mCrossSectionType = CrossSectionType::NONE;
-
-    Point3f mCrossSectionMin = Point3f::min();
-    Point3f mCrossSectionMax = Point3f::max();
-
 public:
     using MatIt = std::vector<Material>::const_iterator;
 
@@ -63,30 +60,17 @@ class AbstractDrawableMesh : public vcl::DrawableObject
     AbstractDrawableMesh(const AbstractDrawableMesh& other) = default;
 
     template<MeshConcept MeshType>
-    AbstractDrawableMesh(const MeshType& m) : mMRS(m)
+    AbstractDrawableMesh(const MeshType& m) : mMRS(m), mCSS(m)
     {
     }
 
     const MeshRenderSettings& renderSettings() const { return mMRS; }
 
-    bool isCrossSectionEnabled() const
-    {
-        return mCrossSectionType != CrossSectionType::NONE;
-    }
-
-    void setCrossSectionType(CrossSectionType type)
-    {
-        mCrossSectionType = type;
-    }
-
-    void setCrossSectionMin(const Point3f& minPoint)
-    {
-        mCrossSectionMin = minPoint;
-    }
+    const CrossSectionSettings& crossSectionSettings() const { return mCSS; }
 
-    void setCrossSectionMax(const Point3f& maxPoint)
+    void setCrossSectionSettings(const CrossSectionSettings& css)
     {
-        mCrossSectionMax = maxPoint;
+        mCSS = css;
     }
 
     virtual void updateBuffers(
@@ -124,10 +108,8 @@ class AbstractDrawableMesh : public vcl::DrawableObject
         using std::swap;
         vcl::DrawableObject::swap(other);
         swap(mMRS, other.mMRS);
+        swap(mCSS, other.mCSS);
         swap(mBoundingBox, other.mBoundingBox);
-        swap(mCrossSectionType, other.mCrossSectionType);
-        swap(mCrossSectionMin, other.mCrossSectionMin);
-        swap(mCrossSectionMax, other.mCrossSectionMax);
     }
 
     // if the mesh does not have a bounding box, or if it has it but it is
diff --git a/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h b/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
new file mode 100644
index 0000000000..fd2769fe97
--- /dev/null
+++ b/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
@@ -0,0 +1,101 @@
+/*****************************************************************************
+ * VCLib                                                                     *
+ * Visual Computing Library                                                  *
+ *                                                                           *
+ * Copyright(C) 2021-2026                                                    *
+ * Visual Computing Lab                                                      *
+ * ISTI - Italian National Research Council                                  *
+ *                                                                           *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the Mozilla Public License Version 2.0 as published *
+ * by the Mozilla Foundation; either version 2 of the License, or            *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program is distributed in the hope that it will be useful,           *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
+ * Mozilla Public License Version 2.0                                        *
+ * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
+ ****************************************************************************/
+
+#ifndef VCL_RENDER_DRAWABLE_MESH_CROSS_SECTION_SETTINGS_H
+#define VCL_RENDER_DRAWABLE_MESH_CROSS_SECTION_SETTINGS_H
+
+#include <vclib/algorithms/mesh.h>
+#include <vclib/mesh.h>
+#include <vclib/space/core.h>
+
+namespace vcl {
+
+class CrossSectionSettings
+{
+public:
+    enum class CrossSectionType { NONE, PER_VERTEX, PER_FRAGMENT };
+
+private:
+    CrossSectionType mType = CrossSectionType::NONE;
+
+    Box3f mBBox = Box3f(Point3f::min(), Point3f::max());
+
+    Point3f mLower = Point3f::min();
+    Point3f mUpper = Point3f::max();
+
+public:
+    CrossSectionSettings() = default;
+
+    template<MeshConcept MeshType>
+    CrossSectionSettings(const MeshType& m)
+    {
+        mBBox = vcl::boundingBox(m).template cast<float>();
+        if constexpr (HasTransformMatrix<MeshType>) {
+            Matrix44f transform = m.transformMatrix().template cast<float>();
+            mBBox               = transformBox(mBBox, transform);
+        }
+        mLower = mBBox.min();
+        mUpper = mBBox.max();
+    }
+
+    bool isEnabled() const { return mType != CrossSectionType::NONE; }
+
+    CrossSectionType& type() { return mType; }
+
+    CrossSectionType type() const { return mType; }
+
+    const Box3f& boundingBox() const { return mBBox; }
+
+    const Point3f& lower() const { return mLower; }
+
+    const Point3f& upper() const { return mUpper; }
+
+    void setBoundingBox(const Box3f& bbox)
+    {
+        mBBox = bbox;
+
+        if (mLower < bbox.min()) {
+            mLower = bbox.min();
+        }
+        if (mUpper > bbox.max()) {
+            mUpper = bbox.max();
+        }
+    }
+
+    void setLower(const Point3f& lower)
+    {
+        if (mBBox.isInside(lower)) {
+            mLower = lower;
+        }
+    }
+
+    void setUpper(const Point3f& upper)
+    {
+        if (mBBox.isInside(upper)) {
+            mUpper = upper;
+        }
+    }
+};
+
+} // namespace vcl
+
+#endif // VCL_RENDER_DRAWABLE_MESH_CROSS_SECTION_SETTINGS_H
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
index a5808003ff..7c536e55c4 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
@@ -19,19 +19,7 @@
   <property name="windowTitle">
    <string>Frame</string>
   </property>
-  <layout class="QGridLayout" name="gridLayout_3">
-   <property name="leftMargin">
-    <number>0</number>
-   </property>
-   <property name="topMargin">
-    <number>0</number>
-   </property>
-   <property name="rightMargin">
-    <number>0</number>
-   </property>
-   <property name="bottomMargin">
-    <number>0</number>
-   </property>
+  <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
@@ -39,8 +27,80 @@
      </property>
     </widget>
    </item>
+   <item row="1" column="0">
+    <widget class="QFrame" name="crossSectionFrame">
+     <property name="frameShape">
+      <enum>QFrame::Shape::NoFrame</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Shadow::Plain</enum>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_2">
+      <item row="1" column="0">
+       <widget class="QFrame" name="controlsFrame">
+        <property name="enabled">
+         <bool>false</bool>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::Shape::NoFrame</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Shadow::Plain</enum>
+        </property>
+        <layout class="QGridLayout" name="gridLayout_3">
+         <property name="leftMargin">
+          <number>0</number>
+         </property>
+         <property name="topMargin">
+          <number>0</number>
+         </property>
+         <property name="rightMargin">
+          <number>0</number>
+         </property>
+         <property name="bottomMargin">
+          <number>0</number>
+         </property>
+         <item row="0" column="0">
+          <widget class="QRadioButton" name="radioButton">
+           <property name="text">
+            <string>Per Vertex</string>
+           </property>
+           <property name="checked">
+            <bool>true</bool>
+           </property>
+           <attribute name="buttonGroup">
+            <string notr="true">crossSectionTypeButton</string>
+           </attribute>
+          </widget>
+         </item>
+         <item row="0" column="1">
+          <widget class="QRadioButton" name="radioButton_2">
+           <property name="text">
+            <string>Per Fragment</string>
+           </property>
+           <attribute name="buttonGroup">
+            <string notr="true">crossSectionTypeButton</string>
+           </attribute>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item row="0" column="0">
+       <widget class="QCheckBox" name="checkBox">
+        <property name="text">
+         <string>Enable Cross Section</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>
  <connections/>
+ <buttongroups>
+  <buttongroup name="crossSectionTypeButton"/>
+ </buttongroups>
 </ui>

From ca6a604d66e0db1b767aeea856e53bcd5257a919 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 08:50:47 +0200
Subject: [PATCH 07/49] [render] Fix input on surface fragment shaders

---
 .../generic_mesh_render_settings_frame.h                        | 2 +-
 .../drawable_mesh/surface/fs_surface_flat_color_face.sc         | 2 +-
 .../drawable_mesh/surface/fs_surface_flat_color_mesh.sc         | 2 +-
 .../drawable_mesh/surface/fs_surface_flat_color_user.sc         | 2 +-
 .../drawable_mesh/surface/fs_surface_flat_color_vertex.sc       | 2 +-
 .../drawable_mesh/surface/fs_surface_flat_tex_vertex.sc         | 2 +-
 .../drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc | 2 +-
 .../drawable_mesh/surface/fs_surface_none_color_face.sc         | 2 +-
 .../drawable_mesh/surface/fs_surface_none_color_mesh.sc         | 2 +-
 .../drawable_mesh/surface/fs_surface_none_color_user.sc         | 2 +-
 .../drawable_mesh/surface/fs_surface_none_color_vertex.sc       | 2 +-
 .../drawable_mesh/surface/fs_surface_none_tex_vertex.sc         | 2 +-
 .../drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc | 2 +-
 .../drawable_mesh/surface/fs_surface_smooth_color_face.sc       | 2 +-
 .../drawable_mesh/surface/fs_surface_smooth_color_mesh.sc       | 2 +-
 .../drawable_mesh/surface/fs_surface_smooth_color_user.sc       | 2 +-
 .../drawable_mesh/surface/fs_surface_smooth_color_vertex.sc     | 2 +-
 .../drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc       | 2 +-
 .../drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc        | 2 +-
 .../bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc  | 2 +-
 .../bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh      | 2 +-
 21 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/generic_mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/generic_mesh_render_settings_frame.h
index 2edc071c5c..0f27c0318f 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/generic_mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/generic_mesh_render_settings_frame.h
@@ -47,7 +47,7 @@ class GenericMeshRenderSettingsFrame : public QFrame
     virtual void updateFrameFromSettings() = 0;
 
 signals:
-    void settingsUpdated();
+    void meshRenderSettingsUpdated();
 
 protected:
     static void   setButtonBackGround(QPushButton* b, const QColor& c);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
index 49fea687cb..59715944b0 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "flat.sh"
 #include "color_face.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
index d62d3580b6..e82658be79 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "flat.sh"
 #include "color_mesh.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
index d4339c7fe1..28e612c6de 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "flat.sh"
 #include "color_user.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
index fd47161067..075b1dedf2 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "flat.sh"
 #include "color_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
index 874ff0d8ee..a08e2d66e1 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "flat.sh"
 #include "tex_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
index acc9fd36cd..ca01b58446 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "flat.sh"
 #include "tex_wedge.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
index d8e5c5c8ae..f1da27f761 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "none.sh"
 #include "color_face.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
index d863948163..816ffef4bb 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "none.sh"
 #include "color_mesh.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
index fe3fe4e4cb..16a97f8b41 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "none.sh"
 #include "color_user.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
index c786fec50b..e5779a82ee 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "none.sh"
 #include "color_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
index 892f817851..730cb527db 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "none.sh"
 #include "tex_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
index 2bb8a1bba6..3255e57a5d 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "none.sh"
 #include "tex_wedge.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
index dc4d3b9758..75db62cd07 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "smooth.sh"
 #include "color_face.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
index e95c86eb1c..3c1b47a1c4 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "smooth.sh"
 #include "color_mesh.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
index 4ce79ec89d..928c90292b 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "smooth.sh"
 #include "color_user.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
index 087de81ca5..79a328a218 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "smooth.sh"
 #include "color_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
index 77d5102b52..7780305822 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "smooth.sh"
 #include "tex_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
index bf9b0577f0..136b595878 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
@@ -1,4 +1,4 @@
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include "smooth.sh"
 #include "tex_wedge.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
index cd95323eee..b9e0989ded 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
@@ -20,7 +20,7 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/drawable_mesh_texture_uniforms.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
index cfdbc3c9bd..00c8641fe3 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
@@ -20,7 +20,7 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/drawable_mesh_texture_uniforms.sh>

From 907d79f4074b000c70e8cd09a7ffe69e379e69bd Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 08:51:26 +0200
Subject: [PATCH 08/49] [render] Rename settingsUpdated signal to
 meshRenderSettingsUpdated throughout code

---
 .../vclib/qt/gui/mesh_render_settings_frame.h    |  2 +-
 vclib/render/include/vclib/qt/mesh_viewer.h      |  2 +-
 .../vclib/qt/gui/mesh_render_settings_frame.cpp  |  5 ++++-
 .../mesh_render_settings_frame/edges_frame.cpp   | 14 +++++++-------
 .../mesh_render_settings_frame/points_frame.cpp  | 16 ++++++++--------
 .../mesh_render_settings_frame/surface_frame.cpp | 12 ++++++------
 .../wireframe_frame.cpp                          | 12 ++++++------
 vclib/render/src/vclib/qt/mesh_viewer.cpp        | 12 ++++++------
 8 files changed, 39 insertions(+), 36 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
index 616a763423..055ae8e9ac 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
@@ -57,7 +57,7 @@ class MeshRenderSettingsFrame : public QFrame
         bool                      changeCurrentTab = false);
 
 signals:
-    void settingsUpdated();
+    void meshRenderSettingsUpdated();
 
 private:
     enum { POINTS_FRAME = 0, SURFACE_FRAME, WIREFRAME_FRAME, EDGES_FRAME };
diff --git a/vclib/render/include/vclib/qt/mesh_viewer.h b/vclib/render/include/vclib/qt/mesh_viewer.h
index 46f4db8655..95ebd2d195 100644
--- a/vclib/render/include/vclib/qt/mesh_viewer.h
+++ b/vclib/render/include/vclib/qt/mesh_viewer.h
@@ -94,7 +94,7 @@ public slots:
 
     void selectedDrawableObjectChanged(uint i);
 
-    void renderSettingsUpdated();
+    void meshRenderSettingsUpdated();
 
     void fitScene();
 
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
index d40622673a..a7e5cf6a97 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
@@ -57,7 +57,10 @@ MeshRenderSettingsFrame::MeshRenderSettingsFrame(QWidget* parent) :
 
     for (auto* frame : frames) {
         connect(
-            frame, SIGNAL(settingsUpdated()), this, SIGNAL(settingsUpdated()));
+            frame,
+            SIGNAL(meshRenderSettingsUpdated()),
+            this,
+            SIGNAL(meshRenderSettingsUpdated()));
     }
 }
 
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/edges_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/edges_frame.cpp
index a184e8f8a8..215af93620 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/edges_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/edges_frame.cpp
@@ -154,14 +154,14 @@ void EdgesFrame::updateColorComboBoxFromSettings()
 void EdgesFrame::onVisibilityChanged(Qt::CheckState arg1)
 {
     mMRS.setEdges(VISIBLE, arg1 == Qt::CheckState::Checked);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void EdgesFrame::onShadingSmoothToggled(bool checked)
 {
     if (checked) {
         mMRS.setEdges(SHADING_SMOOTH);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -169,7 +169,7 @@ void EdgesFrame::onShadingFlatToggled(bool checked)
 {
     if (checked) {
         mMRS.setEdges(SHADING_FLAT);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -177,7 +177,7 @@ void EdgesFrame::onShadingNoneToggled(bool checked)
 {
     if (checked) {
         mMRS.setEdges(SHADING_NONE);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -190,19 +190,19 @@ void EdgesFrame::onColorComboBoxChanged(int index)
     case E_USER: mMRS.setEdges(COLOR_USER); break;
     }
     mUI->userColorFrame->setEnabled(index == E_USER);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void EdgesFrame::onUserColorChanged(const QColor& c)
 {
     mMRS.setEdgesUserColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void EdgesFrame::onSizeChanged(int value)
 {
     mMRS.setEdgesWidth(value);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/points_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/points_frame.cpp
index 6414d89c9f..649d796754 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/points_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/points_frame.cpp
@@ -154,14 +154,14 @@ void PointsFrame::updateColorComboBoxFromSettings()
 void PointsFrame::onVisibilityChanged(Qt::CheckState arg1)
 {
     mMRS.setPoints(VISIBLE, arg1 == Qt::CheckState::Checked);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void PointsFrame::onShapeCircleToggled(bool checked)
 {
     if (checked) {
         mMRS.setPoints(SHAPE_CIRCLE);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -169,7 +169,7 @@ void PointsFrame::onShapePixelToggled(bool checked)
 {
     if (checked) {
         mMRS.setPoints(SHAPE_PIXEL);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -177,7 +177,7 @@ void PointsFrame::onShadingVertexToggled(bool checked)
 {
     if (checked) {
         mMRS.setPoints(SHADING_VERT);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -185,7 +185,7 @@ void PointsFrame::onShadingNoneToggled(bool checked)
 {
     if (checked) {
         mMRS.setPoints(SHADING_NONE);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -197,19 +197,19 @@ void PointsFrame::onColorComboBoxChanged(int index)
     case P_USER: mMRS.setPoints(COLOR_USER); break;
     }
     mUI->userColorFrame->setEnabled(index == P_USER);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void PointsFrame::onUserColorChanged(const QColor& c)
 {
     mMRS.setPointsUserColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void PointsFrame::onSizeChanged(int value)
 {
     mMRS.setPointsWidth(value);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp
index 86996db711..4ee153c785 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp
@@ -169,14 +169,14 @@ void SurfaceFrame::updateColorComboBoxFromSettings()
 void SurfaceFrame::onVisibilityChanged(Qt::CheckState arg1)
 {
     mMRS.setSurface(VISIBLE, arg1 == Qt::CheckState::Checked);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void SurfaceFrame::onShadingSmoothToggled(bool checked)
 {
     if (checked) {
         mMRS.setSurface(SHADING_SMOOTH);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -184,7 +184,7 @@ void SurfaceFrame::onShadingFlatToggled(bool checked)
 {
     if (checked) {
         mMRS.setSurface(SHADING_FLAT);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -192,7 +192,7 @@ void SurfaceFrame::onShadingNoneToggled(bool checked)
 {
     if (checked) {
         mMRS.setSurface(SHADING_NONE);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -207,13 +207,13 @@ void SurfaceFrame::onColorComboBoxChanged(int index)
     case SC_USER: mMRS.setSurface(COLOR_USER); break;
     }
     mUI->userColorFrame->setEnabled(index == SC_USER);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void SurfaceFrame::onUserColorChanged(const QColor& c)
 {
     mMRS.setSurfaceUserColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/wireframe_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/wireframe_frame.cpp
index 073ac80e63..1e5db68376 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/wireframe_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/wireframe_frame.cpp
@@ -136,14 +136,14 @@ void WireframeFrame::updateColorComboBoxFromSettings()
 void WireframeFrame::onVisibilityChanged(Qt::CheckState arg1)
 {
     mMRS.setWireframe(VISIBLE, arg1 == Qt::CheckState::Checked);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void WireframeFrame::onShadingVertexToggled(bool checked)
 {
     if (checked) {
         mMRS.setWireframe(SHADING_VERT);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -151,7 +151,7 @@ void WireframeFrame::onShadingNoneToggled(bool checked)
 {
     if (checked) {
         mMRS.setWireframe(SHADING_NONE);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 
@@ -163,19 +163,19 @@ void WireframeFrame::onColorComboBoxChanged(int index)
     case W_USER: mMRS.setWireframe(COLOR_USER); break;
     }
     mUI->userColorFrame->setEnabled(index == W_USER);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void WireframeFrame::onUserColorChanged(const QColor& c)
 {
     mMRS.setWireframeUserColor(c.redF(), c.greenF(), c.blueF(), c.alphaF());
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 void WireframeFrame::onSizeChanged(int value)
 {
     mMRS.setWireframeWidth(value);
-    emit settingsUpdated();
+    emit meshRenderSettingsUpdated();
 }
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/mesh_viewer.cpp b/vclib/render/src/vclib/qt/mesh_viewer.cpp
index d3c7c94543..a429f6b6d2 100644
--- a/vclib/render/src/vclib/qt/mesh_viewer.cpp
+++ b/vclib/render/src/vclib/qt/mesh_viewer.cpp
@@ -88,12 +88,12 @@ MeshViewer::MeshViewer(QWidget* parent) :
     mUI->viewerRenderSettingsFrame->setViewer(mUI->viewer);
 
     // each time that the RenderSettingsFrame updates its settings, we call the
-    // renderSettingsUpdated() member function
+    // meshRenderSettingsUpdated() member function
     connect(
         mUI->meshRenderSettingsFrame,
-        SIGNAL(settingsUpdated()),
+        SIGNAL(meshRenderSettingsUpdated()),
         this,
-        SLOT(renderSettingsUpdated()));
+        SLOT(meshRenderSettingsUpdated()));
 
     // each time that the drawVectorTree changes the visibility of an object,
     // we update the current settings of the RenderSettingsFrame, and we update
@@ -248,13 +248,13 @@ void MeshViewer::selectedDrawableObjectChanged(uint i)
 
 /**
  * @brief Slot called every time that the MeshRenderSettingsFrame emits
- * 'settingsUpdated()', that is when the user changes render settings of a
- * GeneriDrawableMesh.
+ * 'meshRenderSettingsUpdated()', that is when the user changes render settings
+ * of a GeneriDrawableMesh.
  *
  * We need to get the selected GeneriDrawableMesh first, and then update the
  * settings to it.
  */
-void MeshViewer::renderSettingsUpdated()
+void MeshViewer::meshRenderSettingsUpdated()
 {
     // The user changed the RenderSettings of the ith object.
     uint i = mUI->drawVectorTree->selectedDrawableObject();

From 6462ce105f8a2dddc56d9a56ae6c25c23551c99b Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 09:34:56 +0200
Subject: [PATCH 09/49] [render] CrossSectionSettingsFrame class

---
 .../vclib/qt/gui/mesh_render_settings_frame.h |  5 ++
 .../cross_section_settings_frame.h            | 66 +++++++++++++++
 .../qt/gui/mesh_render_settings_frame.cpp     | 12 +++
 .../qt/gui/mesh_render_settings_frame.ui      | 73 +++--------------
 .../cross_section_settings_frame.cpp          | 65 +++++++++++++++
 .../cross_section_settings_frame.ui           | 81 +++++++++++++++++++
 vclib/render/src/vclib/qt/mesh_viewer.cpp     | 12 ++-
 7 files changed, 249 insertions(+), 65 deletions(-)
 create mode 100644 vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
 create mode 100644 vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
 create mode 100644 vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
index 055ae8e9ac..92e9b2bdb6 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
@@ -25,6 +25,7 @@
 
 #include "mesh_render_settings_frame/generic_mesh_render_settings_frame.h"
 
+#include <vclib/render/drawable/mesh/cross_section_settings.h>
 #include <vclib/render/drawable/mesh/mesh_render_settings.h>
 
 #include <QFrame>
@@ -52,10 +53,14 @@ class MeshRenderSettingsFrame : public QFrame
 
     const MeshRenderSettings& meshRenderSettings() const;
 
+    const CrossSectionSettings& crossSectionSettings() const;
+
     void setMeshRenderSettings(
         const MeshRenderSettings& settings,
         bool                      changeCurrentTab = false);
 
+    void setCrossSectionSettings(const CrossSectionSettings& settings);
+
 signals:
     void meshRenderSettingsUpdated();
 
diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
new file mode 100644
index 0000000000..50bba3988d
--- /dev/null
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -0,0 +1,66 @@
+/*****************************************************************************
+ * VCLib                                                                     *
+ * Visual Computing Library                                                  *
+ *                                                                           *
+ * Copyright(C) 2021-2026                                                    *
+ * Visual Computing Lab                                                      *
+ * ISTI - Italian National Research Council                                  *
+ *                                                                           *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the Mozilla Public License Version 2.0 as published *
+ * by the Mozilla Foundation; either version 2 of the License, or            *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program is distributed in the hope that it will be useful,           *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
+ * Mozilla Public License Version 2.0                                        *
+ * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
+ ****************************************************************************/
+
+#ifndef VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_CROSS_SECTION_SETTINGS_FRAME_H
+#define VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_CROSS_SECTION_SETTINGS_FRAME_H
+
+#include <vclib/render/drawable/mesh/cross_section_settings.h>
+
+#include <QFrame>
+
+namespace vcl::qt {
+
+namespace Ui {
+class CrossSectionSettingsFrame;
+} // namespace Ui
+
+class CrossSectionSettingsFrame : public QFrame
+{
+    Q_OBJECT
+
+    Ui::CrossSectionSettingsFrame* mUI;
+
+    CrossSectionSettings mCSS;
+
+public:
+    explicit CrossSectionSettingsFrame(
+        const CrossSectionSettings css,
+        QWidget*                   parent = nullptr);
+
+    explicit CrossSectionSettingsFrame(QWidget* parent = nullptr);
+
+    ~CrossSectionSettingsFrame();
+
+     const CrossSectionSettings& crossSectionSettings() const;
+
+     void setCrossSectionSettings(const CrossSectionSettings& settings);
+
+signals:
+    void crossSectionSettingsUpdated();
+
+private:
+    void updateFrameFromSettings();
+};
+
+} // namespace vcl::qt
+
+#endif // VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_CROSS_SECTION_SETTINGS_FRAME_H
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
index a7e5cf6a97..c169928c1d 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
@@ -74,6 +74,12 @@ const MeshRenderSettings& MeshRenderSettingsFrame::meshRenderSettings() const
     return mMRS;
 }
 
+const CrossSectionSettings& MeshRenderSettingsFrame::crossSectionSettings()
+    const
+{
+    return mUI->crossSectionFrame->crossSectionSettings();
+}
+
 void MeshRenderSettingsFrame::setMeshRenderSettings(
     const MeshRenderSettings& settings,
     bool                      changeCurrentTab /*= false*/)
@@ -82,6 +88,12 @@ void MeshRenderSettingsFrame::setMeshRenderSettings(
     updateGuiFromSettings(changeCurrentTab);
 }
 
+void MeshRenderSettingsFrame::setCrossSectionSettings(
+    const CrossSectionSettings& settings)
+{
+    mUI->crossSectionFrame->setCrossSectionSettings(settings);
+}
+
 void MeshRenderSettingsFrame::updateGuiFromSettings(bool changeCurrentTab)
 {
     using MRI = MeshRenderInfo;
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
index 7c536e55c4..4a3fc920b5 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
@@ -28,79 +28,26 @@
     </widget>
    </item>
    <item row="1" column="0">
-    <widget class="QFrame" name="crossSectionFrame">
+    <widget class="vcl::qt::CrossSectionSettingsFrame" name="crossSectionFrame">
      <property name="frameShape">
       <enum>QFrame::Shape::NoFrame</enum>
      </property>
      <property name="frameShadow">
       <enum>QFrame::Shadow::Plain</enum>
      </property>
-     <layout class="QGridLayout" name="gridLayout_2">
-      <item row="1" column="0">
-       <widget class="QFrame" name="controlsFrame">
-        <property name="enabled">
-         <bool>false</bool>
-        </property>
-        <property name="frameShape">
-         <enum>QFrame::Shape::NoFrame</enum>
-        </property>
-        <property name="frameShadow">
-         <enum>QFrame::Shadow::Plain</enum>
-        </property>
-        <layout class="QGridLayout" name="gridLayout_3">
-         <property name="leftMargin">
-          <number>0</number>
-         </property>
-         <property name="topMargin">
-          <number>0</number>
-         </property>
-         <property name="rightMargin">
-          <number>0</number>
-         </property>
-         <property name="bottomMargin">
-          <number>0</number>
-         </property>
-         <item row="0" column="0">
-          <widget class="QRadioButton" name="radioButton">
-           <property name="text">
-            <string>Per Vertex</string>
-           </property>
-           <property name="checked">
-            <bool>true</bool>
-           </property>
-           <attribute name="buttonGroup">
-            <string notr="true">crossSectionTypeButton</string>
-           </attribute>
-          </widget>
-         </item>
-         <item row="0" column="1">
-          <widget class="QRadioButton" name="radioButton_2">
-           <property name="text">
-            <string>Per Fragment</string>
-           </property>
-           <attribute name="buttonGroup">
-            <string notr="true">crossSectionTypeButton</string>
-           </attribute>
-          </widget>
-         </item>
-        </layout>
-       </widget>
-      </item>
-      <item row="0" column="0">
-       <widget class="QCheckBox" name="checkBox">
-        <property name="text">
-         <string>Enable Cross Section</string>
-        </property>
-       </widget>
-      </item>
-     </layout>
+     <layout class="QGridLayout" name="gridLayout_2"/>
     </widget>
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>vcl::qt::CrossSectionSettingsFrame</class>
+   <extends>QFrame</extends>
+   <header>vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections/>
- <buttongroups>
-  <buttongroup name="crossSectionTypeButton"/>
- </buttongroups>
 </ui>
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
new file mode 100644
index 0000000000..fce73af3ca
--- /dev/null
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -0,0 +1,65 @@
+/*****************************************************************************
+ * VCLib                                                                     *
+ * Visual Computing Library                                                  *
+ *                                                                           *
+ * Copyright(C) 2021-2026                                                    *
+ * Visual Computing Lab                                                      *
+ * ISTI - Italian National Research Council                                  *
+ *                                                                           *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This program is free software; you can redistribute it and/or modify      *
+ * it under the terms of the Mozilla Public License Version 2.0 as published *
+ * by the Mozilla Foundation; either version 2 of the License, or            *
+ * (at your option) any later version.                                       *
+ *                                                                           *
+ * This program is distributed in the hope that it will be useful,           *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
+ * Mozilla Public License Version 2.0                                        *
+ * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
+ ****************************************************************************/
+
+#include <vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h>
+
+#include "ui_cross_section_settings_frame.h"
+
+namespace vcl::qt {
+
+CrossSectionSettingsFrame::CrossSectionSettingsFrame(
+    const CrossSectionSettings css,
+    QWidget*                   parent) :
+        QFrame(parent), mUI(new Ui::CrossSectionSettingsFrame), mCSS(css)
+{
+    mUI->setupUi(this);
+    updateFrameFromSettings();
+}
+
+CrossSectionSettingsFrame::CrossSectionSettingsFrame(QWidget* parent) :
+        CrossSectionSettingsFrame(CrossSectionSettings(), parent)
+{
+}
+
+CrossSectionSettingsFrame::~CrossSectionSettingsFrame()
+{
+    delete mUI;
+}
+
+const CrossSectionSettings& CrossSectionSettingsFrame::crossSectionSettings()
+    const
+{
+    return mCSS;
+}
+
+void CrossSectionSettingsFrame::setCrossSectionSettings(
+    const CrossSectionSettings& settings)
+{
+    mCSS = settings;
+    updateFrameFromSettings();
+}
+
+void CrossSectionSettingsFrame::updateFrameFromSettings()
+{
+}
+
+} // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
new file mode 100644
index 0000000000..4cf982d410
--- /dev/null
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>vcl::qt::CrossSectionSettingsFrame</class>
+ <widget class="QFrame" name="vcl::qt::CrossSectionSettingsFrame">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Frame</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="QCheckBox" name="crosSectionEnabledCheckBox">
+     <property name="text">
+      <string>Enable Cross Section</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0">
+    <widget class="QFrame" name="controlsFrame">
+     <property name="enabled">
+      <bool>false</bool>
+     </property>
+     <property name="frameShape">
+      <enum>QFrame::Shape::NoFrame</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Shadow::Plain</enum>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_3">
+      <property name="leftMargin">
+       <number>0</number>
+      </property>
+      <property name="topMargin">
+       <number>0</number>
+      </property>
+      <property name="rightMargin">
+       <number>0</number>
+      </property>
+      <property name="bottomMargin">
+       <number>0</number>
+      </property>
+      <item row="0" column="0">
+       <widget class="QRadioButton" name="perVertexRadioButton">
+        <property name="text">
+         <string>Per Vertex</string>
+        </property>
+        <property name="checked">
+         <bool>true</bool>
+        </property>
+        <attribute name="buttonGroup">
+         <string notr="true">crossSectionTypeButton</string>
+        </attribute>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QRadioButton" name="perFragmentRadioButton">
+        <property name="text">
+         <string>Per Fragment</string>
+        </property>
+        <attribute name="buttonGroup">
+         <string notr="true">crossSectionTypeButton</string>
+        </attribute>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+ <buttongroups>
+  <buttongroup name="crossSectionTypeButton"/>
+ </buttongroups>
+</ui>
diff --git a/vclib/render/src/vclib/qt/mesh_viewer.cpp b/vclib/render/src/vclib/qt/mesh_viewer.cpp
index a429f6b6d2..daa948c85f 100644
--- a/vclib/render/src/vclib/qt/mesh_viewer.cpp
+++ b/vclib/render/src/vclib/qt/mesh_viewer.cpp
@@ -215,6 +215,8 @@ void MeshViewer::visibilityDrawableObjectChanged()
         if (m) {
             mUI->meshRenderSettingsFrame->setMeshRenderSettings(
                 m->renderSettings());
+            mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+                m->crossSectionSettings());
         }
         mUI->viewer->update();
     }
@@ -238,6 +240,8 @@ void MeshViewer::selectedDrawableObjectChanged(uint i)
         mUI->meshRenderSettingsFrame->setMeshRenderSettings(
             m->renderSettings());
         mUI->meshRenderSettingsFrame->setEnabled(true);
+        mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+            m->crossSectionSettings());
     }
     else {
         // it is not a AbstractDrawableMesh, RenderSettingsFrame must be
@@ -249,9 +253,9 @@ void MeshViewer::selectedDrawableObjectChanged(uint i)
 /**
  * @brief Slot called every time that the MeshRenderSettingsFrame emits
  * 'meshRenderSettingsUpdated()', that is when the user changes render settings
- * of a GeneriDrawableMesh.
+ * of an AbstractDrawableMesh.
  *
- * We need to get the selected GeneriDrawableMesh first, and then update the
+ * We need to get the selected AbstractDrawableMesh first, and then update the
  * settings to it.
  */
 void MeshViewer::meshRenderSettingsUpdated()
@@ -268,6 +272,8 @@ void MeshViewer::meshRenderSettingsUpdated()
         // AbstractDrawableMesh
         m->setRenderSettings(
             mUI->meshRenderSettingsFrame->meshRenderSettings());
+        m->setCrossSectionSettings(
+            mUI->meshRenderSettingsFrame->crossSectionSettings());
         mUI->viewer->update();
     }
 }
@@ -297,6 +303,8 @@ void MeshViewer::updateGUI()
             mUI->meshRenderSettingsFrame->setMeshRenderSettings(
                 m->renderSettings(), true);
             mUI->meshRenderSettingsFrame->setEnabled(true);
+            mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+                m->crossSectionSettings());
         }
         else {
             mUI->meshRenderSettingsFrame->setEnabled(false);

From aba1c42d823e510d28fa52d4663765e99fece796 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 09:53:49 +0200
Subject: [PATCH 10/49] [render] Add cross-section controls and signal handlers
 to settings frame

---
 .../cross_section_settings_frame.h            |  5 ++
 .../qt/gui/mesh_render_settings_frame.cpp     |  6 ++
 .../qt/gui/mesh_render_settings_frame.ui      |  1 -
 .../cross_section_settings_frame.cpp          | 69 +++++++++++++++++++
 .../cross_section_settings_frame.ui           |  6 +-
 5 files changed, 83 insertions(+), 4 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index 50bba3988d..b104aeee5c 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -59,6 +59,11 @@ class CrossSectionSettingsFrame : public QFrame
 
 private:
     void updateFrameFromSettings();
+
+private slots:
+    void onCrossSectionEnabledChanged(Qt::CheckState arg1);
+    void onPerVertexToggled(bool checked);
+    void onPerFragmentToggled(bool checked);
 };
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
index c169928c1d..72379c0f81 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
@@ -62,6 +62,12 @@ MeshRenderSettingsFrame::MeshRenderSettingsFrame(QWidget* parent) :
             this,
             SIGNAL(meshRenderSettingsUpdated()));
     }
+
+    connect(
+        mUI->crossSectionFrame,
+        SIGNAL(crossSectionSettingsUpdated()),
+        this,
+        SIGNAL(meshRenderSettingsUpdated()));
 }
 
 MeshRenderSettingsFrame::~MeshRenderSettingsFrame()
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
index 4a3fc920b5..6eefbd7d3e 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
@@ -35,7 +35,6 @@
      <property name="frameShadow">
       <enum>QFrame::Shadow::Plain</enum>
      </property>
-     <layout class="QGridLayout" name="gridLayout_2"/>
     </widget>
    </item>
   </layout>
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index fce73af3ca..76cb91b636 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -33,6 +33,24 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
 {
     mUI->setupUi(this);
     updateFrameFromSettings();
+
+    connect(
+        mUI->crosSectionEnabledCheckBox,
+        SIGNAL(checkStateChanged(Qt::CheckState)),
+        this,
+        SLOT(onCrossSectionEnabledChanged(Qt::CheckState)));
+
+    connect(
+        mUI->perVertexRadioButton,
+        SIGNAL(toggled(bool)),
+        this,
+        SLOT(onPerVertexToggled(bool)));
+
+    connect(
+        mUI->perFragmentRadioButton,
+        SIGNAL(toggled(bool)),
+        this,
+        SLOT(onPerFragmentToggled(bool)));
 }
 
 CrossSectionSettingsFrame::CrossSectionSettingsFrame(QWidget* parent) :
@@ -60,6 +78,57 @@ void CrossSectionSettingsFrame::setCrossSectionSettings(
 
 void CrossSectionSettingsFrame::updateFrameFromSettings()
 {
+    using enum CrossSectionSettings::CrossSectionType;
+
+    // radio buttons
+    if (mCSS.type() == PER_VERTEX)
+        mUI->perVertexRadioButton->setChecked(true);
+    else if (mCSS.type() == PER_FRAGMENT)
+        mUI->perFragmentRadioButton->setChecked(true);
+
+    // checkbox, last thing to do
+    if (mCSS.type() == NONE)
+        mUI->crosSectionEnabledCheckBox->setCheckState(
+            Qt::CheckState::Unchecked);
+    else
+        mUI->crosSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
+}
+
+void CrossSectionSettingsFrame::onCrossSectionEnabledChanged(
+    Qt::CheckState arg1)
+{
+    using enum CrossSectionSettings::CrossSectionType;
+
+    if (arg1 != Qt::CheckState::Checked) {
+        mCSS.type() = NONE;
+    }
+    else {
+        if (mUI->perVertexRadioButton->isChecked())
+            mCSS.type() = PER_VERTEX;
+        else
+            mCSS.type() = PER_FRAGMENT;
+    }
+
+    mUI->controlsFrame->setEnabled(arg1 == Qt::CheckState::Checked);
+    emit crossSectionSettingsUpdated();
+}
+
+void CrossSectionSettingsFrame::onPerVertexToggled(bool checked)
+{
+    using enum CrossSectionSettings::CrossSectionType;
+    if (checked) {
+        mCSS.type() = PER_VERTEX;
+        emit crossSectionSettingsUpdated();
+    }
+}
+
+void CrossSectionSettingsFrame::onPerFragmentToggled(bool checked)
+{
+    using enum CrossSectionSettings::CrossSectionType;
+    if (checked) {
+        mCSS.type() = PER_FRAGMENT;
+        emit crossSectionSettingsUpdated();
+    }
 }
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index 4cf982d410..5ee7b13c9d 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -54,7 +54,7 @@
          <bool>true</bool>
         </property>
         <attribute name="buttonGroup">
-         <string notr="true">crossSectionTypeButton</string>
+         <string notr="true">crossSectionTypeButtonGroup</string>
         </attribute>
        </widget>
       </item>
@@ -64,7 +64,7 @@
          <string>Per Fragment</string>
         </property>
         <attribute name="buttonGroup">
-         <string notr="true">crossSectionTypeButton</string>
+         <string notr="true">crossSectionTypeButtonGroup</string>
         </attribute>
        </widget>
       </item>
@@ -76,6 +76,6 @@
  <resources/>
  <connections/>
  <buttongroups>
-  <buttongroup name="crossSectionTypeButton"/>
+  <buttongroup name="crossSectionTypeButtonGroup"/>
  </buttongroups>
 </ui>

From b0ecf7250c5e6b13a331cd9701c71c05698e4266 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 11:38:09 +0200
Subject: [PATCH 11/49] [render] add X slider to CrossSectionFrame

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  |   1 +
 .../vclib/qt/gui/mesh_render_settings_frame.h |   2 +
 .../cross_section_settings_frame.h            |   2 +
 vclib/render/include/vclib/qt/mesh_viewer.h   |   2 +
 .../drawable/mesh/cross_section_settings.h    |   7 ++
 .../drawable_mesh/surface/fs_surface_uber.sc  |   2 +-
 .../qt/gui/mesh_render_settings_frame.cpp     |   2 +-
 .../cross_section_settings_frame.cpp          |  41 +++++++
 .../cross_section_settings_frame.ui           | 101 ++++++++++++++++++
 vclib/render/src/vclib/qt/mesh_viewer.cpp     |  24 ++++-
 10 files changed, 181 insertions(+), 3 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index e975d4beed..1b95a99026 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -138,6 +138,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         mMRB.update(*this, buffersToUpdate);
         mMRS.setRenderCapabilityFrom(*this);
         setRenderSettings(mMRS);
+        mCSS = CrossSectionSettings(*this);
     }
 
     void setRenderSettings(const MeshRenderSettings& rs) override
diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
index 92e9b2bdb6..8938762374 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
@@ -64,6 +64,8 @@ class MeshRenderSettingsFrame : public QFrame
 signals:
     void meshRenderSettingsUpdated();
 
+    void crossSectionSettingsUpdated();
+
 private:
     enum { POINTS_FRAME = 0, SURFACE_FRAME, WIREFRAME_FRAME, EDGES_FRAME };
 
diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index b104aeee5c..22f350e7b2 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -64,6 +64,8 @@ private slots:
     void onCrossSectionEnabledChanged(Qt::CheckState arg1);
     void onPerVertexToggled(bool checked);
     void onPerFragmentToggled(bool checked);
+    void onXFloatRangeSliderLowerValueChanged(float value);
+    void onXFloatRangeSliderUpperValueChanged(float value);
 };
 
 } // namespace vcl::qt
diff --git a/vclib/render/include/vclib/qt/mesh_viewer.h b/vclib/render/include/vclib/qt/mesh_viewer.h
index 95ebd2d195..67e5b365e8 100644
--- a/vclib/render/include/vclib/qt/mesh_viewer.h
+++ b/vclib/render/include/vclib/qt/mesh_viewer.h
@@ -96,6 +96,8 @@ public slots:
 
     void meshRenderSettingsUpdated();
 
+    void crossSectionSettingsUpdated();
+
     void fitScene();
 
     void fitView();
diff --git a/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h b/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
index fd2769fe97..2eef9000a0 100644
--- a/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
@@ -53,6 +53,13 @@ class CrossSectionSettings
             Matrix44f transform = m.transformMatrix().template cast<float>();
             mBBox               = transformBox(mBBox, transform);
         }
+
+        // inflate bbox by epsilon of its diagonal
+        float eps = mBBox.diagonal() * 0.02f;
+
+        mBBox.min() -= eps;
+        mBBox.max() += eps;
+
         mLower = mBBox.min();
         mUpper = mBBox.max();
     }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
index 491962e84b..3c2121492c 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
@@ -34,7 +34,7 @@ BUFFER_RO(primitiveNormals, float, VCL_MRB_PRIMITIVE_NORMAL_BUFFER); // normal o
 
 void main()
 {
-    if (v_discardFlag > 0.0001) { // if vertex is marked as discard, discard the fragment
+    if (v_discardFlag > 0.0) { // if vertex is marked as discard, discard the fragment
         discard;
     }
 
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
index 72379c0f81..c0129cbd77 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
@@ -67,7 +67,7 @@ MeshRenderSettingsFrame::MeshRenderSettingsFrame(QWidget* parent) :
         mUI->crossSectionFrame,
         SIGNAL(crossSectionSettingsUpdated()),
         this,
-        SIGNAL(meshRenderSettingsUpdated()));
+        SIGNAL(crossSectionSettingsUpdated()));
 }
 
 MeshRenderSettingsFrame::~MeshRenderSettingsFrame()
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 76cb91b636..b62f92f739 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -51,6 +51,18 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
         SIGNAL(toggled(bool)),
         this,
         SLOT(onPerFragmentToggled(bool)));
+
+    connect(
+        mUI->xFloatRangeSlider,
+        SIGNAL(lowerValueChanged(float)),
+        this,
+        SLOT(onXFloatRangeSliderLowerValueChanged(float)));
+
+    connect(
+        mUI->xFloatRangeSlider,
+        SIGNAL(upperValueChanged(float)),
+        this,
+        SLOT(onXFloatRangeSliderUpperValueChanged(float)));
 }
 
 CrossSectionSettingsFrame::CrossSectionSettingsFrame(QWidget* parent) :
@@ -86,6 +98,17 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
     else if (mCSS.type() == PER_FRAGMENT)
         mUI->perFragmentRadioButton->setChecked(true);
 
+    mUI->xFloatRangeSlider->blockSignals(true);
+    auto bb = mCSS.boundingBox();
+    mUI->xFloatRangeSlider->setRange(bb.min().x(), bb.max().x());
+
+    auto l = mCSS.lower();
+    auto u = mCSS.upper();
+
+    mUI->xFloatRangeSlider->setLowerValue(l.x());
+    mUI->xFloatRangeSlider->setUpperValue(u.x());
+    mUI->xFloatRangeSlider->blockSignals(false);
+
     // checkbox, last thing to do
     if (mCSS.type() == NONE)
         mUI->crosSectionEnabledCheckBox->setCheckState(
@@ -131,4 +154,22 @@ void CrossSectionSettingsFrame::onPerFragmentToggled(bool checked)
     }
 }
 
+void CrossSectionSettingsFrame::onXFloatRangeSliderLowerValueChanged(
+    float value)
+{
+    auto l = mCSS.lower();
+    l.x() = value;
+    mCSS.setLower(l);
+    emit crossSectionSettingsUpdated();
+}
+
+void CrossSectionSettingsFrame::onXFloatRangeSliderUpperValueChanged(
+    float value)
+{
+    auto u = mCSS.upper();
+    u.x() = value;
+    mCSS.setUpper(u);
+    emit crossSectionSettingsUpdated();
+}
+
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index 5ee7b13c9d..cfeaace0c4 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -68,11 +68,112 @@
         </attribute>
        </widget>
       </item>
+      <item row="1" column="0" colspan="2">
+       <widget class="QFrame" name="frame">
+        <property name="frameShape">
+         <enum>QFrame::Shape::NoFrame</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Shadow::Plain</enum>
+        </property>
+        <layout class="QGridLayout" name="gridLayout_2">
+         <property name="leftMargin">
+          <number>0</number>
+         </property>
+         <property name="topMargin">
+          <number>0</number>
+         </property>
+         <property name="rightMargin">
+          <number>0</number>
+         </property>
+         <property name="bottomMargin">
+          <number>0</number>
+         </property>
+         <item row="1" column="1">
+          <widget class="QDoubleSpinBox" name="xMinSpinBox">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+         <item row="2" column="0">
+          <widget class="QLabel" name="yLabel">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>Y:</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="0">
+          <widget class="QLabel" name="zLabel">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>Z:</string>
+           </property>
+          </widget>
+         </item>
+         <item row="0" column="0" rowspan="2">
+          <widget class="QLabel" name="xLabel">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>X:</string>
+           </property>
+          </widget>
+         </item>
+         <item row="1" column="2">
+          <widget class="QDoubleSpinBox" name="xMaxSpinBox">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+         <item row="0" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="xFloatRangeSlider" native="true">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>vcl::qt::FloatRangeSlider</class>
+   <extends>QWidget</extends>
+   <header>vclib/qt/gui/float_range_slider.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections/>
  <buttongroups>
diff --git a/vclib/render/src/vclib/qt/mesh_viewer.cpp b/vclib/render/src/vclib/qt/mesh_viewer.cpp
index daa948c85f..51a97f0fbe 100644
--- a/vclib/render/src/vclib/qt/mesh_viewer.cpp
+++ b/vclib/render/src/vclib/qt/mesh_viewer.cpp
@@ -95,6 +95,12 @@ MeshViewer::MeshViewer(QWidget* parent) :
         this,
         SLOT(meshRenderSettingsUpdated()));
 
+    connect(
+        mUI->meshRenderSettingsFrame,
+        SIGNAL(crossSectionSettingsUpdated()),
+        this,
+        SLOT(crossSectionSettingsUpdated()));
+
     // each time that the drawVectorTree changes the visibility of an object,
     // we update the current settings of the RenderSettingsFrame, and we update
     // the glArea
@@ -239,9 +245,9 @@ void MeshViewer::selectedDrawableObjectChanged(uint i)
         // set it enabled
         mUI->meshRenderSettingsFrame->setMeshRenderSettings(
             m->renderSettings());
-        mUI->meshRenderSettingsFrame->setEnabled(true);
         mUI->meshRenderSettingsFrame->setCrossSectionSettings(
             m->crossSectionSettings());
+        mUI->meshRenderSettingsFrame->setEnabled(true);
     }
     else {
         // it is not a AbstractDrawableMesh, RenderSettingsFrame must be
@@ -272,6 +278,22 @@ void MeshViewer::meshRenderSettingsUpdated()
         // AbstractDrawableMesh
         m->setRenderSettings(
             mUI->meshRenderSettingsFrame->meshRenderSettings());
+        mUI->viewer->update();
+    }
+}
+
+void MeshViewer::crossSectionSettingsUpdated()
+{
+    // The user changed the CrossSectionSettings of the ith object.
+    uint i = mUI->drawVectorTree->selectedDrawableObject();
+    if (i != UINT_NULL && mDrawableObjectVector->size() > 0) {
+        // The selected object must always be a AbstractDrawableMesh, because
+        // the CrossSectionSettingsFrame (which called this member function) is
+        // visible only when the selected Object is a AbstractDrawableMesh
+        auto m = std::dynamic_pointer_cast<AbstractDrawableMesh>(
+            mDrawableObjectVector->at(i));
+        // get CrossSectionSettings from the CrossSectionSettingsFrame, and set
+        // it to the AbstractDrawableMesh
         m->setCrossSectionSettings(
             mUI->meshRenderSettingsFrame->crossSectionSettings());
         mUI->viewer->update();

From 1d11f09c3f965eaab616353b4db887a5f40b5d60 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 14:20:18 +0200
Subject: [PATCH 12/49] [render] CrossSectionFrame x slider working as expected

---
 .../cross_section_settings_frame.h            | 12 +++
 .../cross_section_settings_frame.cpp          | 82 +++++++++++++++++--
 .../cross_section_settings_frame.ui           |  6 ++
 3 files changed, 94 insertions(+), 6 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index 22f350e7b2..cde77d54d5 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -23,8 +23,10 @@
 #ifndef VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_CROSS_SECTION_SETTINGS_FRAME_H
 #define VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_CROSS_SECTION_SETTINGS_FRAME_H
 
+#include <vclib/qt/gui/float_range_slider.h>
 #include <vclib/render/drawable/mesh/cross_section_settings.h>
 
+#include <QDoubleSpinBox>
 #include <QFrame>
 
 namespace vcl::qt {
@@ -59,6 +61,14 @@ class CrossSectionSettingsFrame : public QFrame
 
 private:
     void updateFrameFromSettings();
+    void updateSlider(
+        FloatRangeSlider* slider,
+        QDoubleSpinBox*   minSpinBox,
+        QDoubleSpinBox*   maxSpinBox,
+        float min,
+        float max,
+        float lower,
+        float upper);
 
 private slots:
     void onCrossSectionEnabledChanged(Qt::CheckState arg1);
@@ -66,6 +76,8 @@ private slots:
     void onPerFragmentToggled(bool checked);
     void onXFloatRangeSliderLowerValueChanged(float value);
     void onXFloatRangeSliderUpperValueChanged(float value);
+    void onXMinSpinBoxValueChanged(double value);
+    void onXMaxSpinBoxValueChanged(double value);
 };
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index b62f92f739..4aeea0f44a 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -63,6 +63,18 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
         SIGNAL(upperValueChanged(float)),
         this,
         SLOT(onXFloatRangeSliderUpperValueChanged(float)));
+
+    connect(
+        mUI->xMinSpinBox,
+        SIGNAL(valueChanged(double)),
+        this,
+        SLOT(onXMinSpinBoxValueChanged(double)));
+
+    connect(
+        mUI->xMaxSpinBox,
+        SIGNAL(valueChanged(double)),
+        this,
+        SLOT(onXMaxSpinBoxValueChanged(double)));
 }
 
 CrossSectionSettingsFrame::CrossSectionSettingsFrame(QWidget* parent) :
@@ -98,16 +110,18 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
     else if (mCSS.type() == PER_FRAGMENT)
         mUI->perFragmentRadioButton->setChecked(true);
 
-    mUI->xFloatRangeSlider->blockSignals(true);
     auto bb = mCSS.boundingBox();
-    mUI->xFloatRangeSlider->setRange(bb.min().x(), bb.max().x());
-
     auto l = mCSS.lower();
     auto u = mCSS.upper();
 
-    mUI->xFloatRangeSlider->setLowerValue(l.x());
-    mUI->xFloatRangeSlider->setUpperValue(u.x());
-    mUI->xFloatRangeSlider->blockSignals(false);
+    updateSlider(
+        mUI->xFloatRangeSlider,
+        mUI->xMinSpinBox,
+        mUI->xMaxSpinBox,
+        bb.min().x(),
+        bb.max().x(),
+        l.x(),
+        u.x());
 
     // checkbox, last thing to do
     if (mCSS.type() == NONE)
@@ -117,6 +131,40 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
         mUI->crosSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
 }
 
+void CrossSectionSettingsFrame::updateSlider(
+    FloatRangeSlider* slider,
+    QDoubleSpinBox*   minSpinBox,
+    QDoubleSpinBox*   maxSpinBox,
+    float             min,
+    float             max,
+    float             lower,
+    float             upper)
+{
+    slider->blockSignals(true);
+
+    slider->setRange(min, max);
+    slider->setLowerValue(lower);
+    slider->setUpperValue(upper);
+
+    slider->blockSignals(false);
+
+    minSpinBox->blockSignals(true);
+
+    minSpinBox->setMinimum(min);
+    minSpinBox->setMaximum(upper);
+    minSpinBox->setValue(lower);
+
+    minSpinBox->blockSignals(false);
+
+    maxSpinBox->blockSignals(true);
+
+    maxSpinBox->setMinimum(lower);
+    maxSpinBox->setMaximum(max);
+    maxSpinBox->setValue(upper);
+
+    maxSpinBox->blockSignals(false);
+}
+
 void CrossSectionSettingsFrame::onCrossSectionEnabledChanged(
     Qt::CheckState arg1)
 {
@@ -160,6 +208,12 @@ void CrossSectionSettingsFrame::onXFloatRangeSliderLowerValueChanged(
     auto l = mCSS.lower();
     l.x() = value;
     mCSS.setLower(l);
+
+    mUI->xMinSpinBox->blockSignals(true);
+    mUI->xMinSpinBox->setValue(value);
+    mUI->xMinSpinBox->blockSignals(false);
+    mUI->xMaxSpinBox->setMinimum(value);
+
     emit crossSectionSettingsUpdated();
 }
 
@@ -169,7 +223,23 @@ void CrossSectionSettingsFrame::onXFloatRangeSliderUpperValueChanged(
     auto u = mCSS.upper();
     u.x() = value;
     mCSS.setUpper(u);
+
+    mUI->xMaxSpinBox->blockSignals(true);
+    mUI->xMaxSpinBox->setValue(value);
+    mUI->xMaxSpinBox->blockSignals(false);
+    mUI->xMinSpinBox->setMaximum(value);
+
     emit crossSectionSettingsUpdated();
 }
 
+void CrossSectionSettingsFrame::onXMinSpinBoxValueChanged(double value)
+{
+    mUI->xFloatRangeSlider->setLowerValue(static_cast<float>(value));
+}
+
+void CrossSectionSettingsFrame::onXMaxSpinBoxValueChanged(double value)
+{
+    mUI->xFloatRangeSlider->setUpperValue(static_cast<float>(value));
+}
+
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index cfeaace0c4..b4e886d97f 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -97,6 +97,9 @@
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
           </widget>
          </item>
          <item row="2" column="0">
@@ -146,6 +149,9 @@
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
           </widget>
          </item>
          <item row="0" column="1" colspan="2">

From 5720c7df07df98adcebe6a3da7f098dcbc7b9085 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Apr 2026 14:46:59 +0200
Subject: [PATCH 13/49] [render] CrossSectionSettingsFrame working

---
 .../cross_section_settings_frame.h            |  15 ++-
 .../cross_section_settings_frame.cpp          | 121 +++++++++++-------
 .../cross_section_settings_frame.ui           |  58 ++++++---
 3 files changed, 121 insertions(+), 73 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index cde77d54d5..ceddd08f82 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -39,8 +39,14 @@ class CrossSectionSettingsFrame : public QFrame
 {
     Q_OBJECT
 
+    enum Axis {X= 0, Y, Z, AXIS_COUNT};
+
     Ui::CrossSectionSettingsFrame* mUI;
 
+    std::array<FloatRangeSlider*, AXIS_COUNT> mFloatSliders;
+    std::array<QDoubleSpinBox*, AXIS_COUNT>   mMinSpinBoxes;
+    std::array<QDoubleSpinBox*, AXIS_COUNT>   mMaxSpinBoxes;
+
     CrossSectionSettings mCSS;
 
 public:
@@ -74,10 +80,11 @@ private slots:
     void onCrossSectionEnabledChanged(Qt::CheckState arg1);
     void onPerVertexToggled(bool checked);
     void onPerFragmentToggled(bool checked);
-    void onXFloatRangeSliderLowerValueChanged(float value);
-    void onXFloatRangeSliderUpperValueChanged(float value);
-    void onXMinSpinBoxValueChanged(double value);
-    void onXMaxSpinBoxValueChanged(double value);
+
+    void onFloatRangeSliderLowerValueChanged(Axis axis, float value);
+    void onFloatRangeSliderUpperValueChanged(Axis axis, float value);
+    void onMinSpinBoxValueChanged(Axis axis, double value);
+    void onMaxSpinBoxValueChanged(Axis axis, double value);
 };
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 4aeea0f44a..6ba9fd029a 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -32,6 +32,19 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
         QFrame(parent), mUI(new Ui::CrossSectionSettingsFrame), mCSS(css)
 {
     mUI->setupUi(this);
+
+    mFloatSliders[X] = mUI->xFloatRangeSlider;
+    mFloatSliders[Y] = mUI->yFloatRangeSlider;
+    mFloatSliders[Z] = mUI->zFloatRangeSlider;
+
+    mMinSpinBoxes[X] = mUI->xMinSpinBox;
+    mMinSpinBoxes[Y] = mUI->yMinSpinBox;
+    mMinSpinBoxes[Z] = mUI->zMinSpinBox;
+
+    mMaxSpinBoxes[X] = mUI->xMaxSpinBox;
+    mMaxSpinBoxes[Y] = mUI->yMaxSpinBox;
+    mMaxSpinBoxes[Z] = mUI->zMaxSpinBox;
+
     updateFrameFromSettings();
 
     connect(
@@ -52,29 +65,37 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
         this,
         SLOT(onPerFragmentToggled(bool)));
 
-    connect(
-        mUI->xFloatRangeSlider,
-        SIGNAL(lowerValueChanged(float)),
-        this,
-        SLOT(onXFloatRangeSliderLowerValueChanged(float)));
-
-    connect(
-        mUI->xFloatRangeSlider,
-        SIGNAL(upperValueChanged(float)),
-        this,
-        SLOT(onXFloatRangeSliderUpperValueChanged(float)));
-
-    connect(
-        mUI->xMinSpinBox,
-        SIGNAL(valueChanged(double)),
-        this,
-        SLOT(onXMinSpinBoxValueChanged(double)));
-
-    connect(
-        mUI->xMaxSpinBox,
-        SIGNAL(valueChanged(double)),
-        this,
-        SLOT(onXMaxSpinBoxValueChanged(double)));
+    for (uint i = X; i < AXIS_COUNT; ++i) {
+        connect(
+            mFloatSliders[i],
+            &FloatRangeSlider::lowerValueChanged,
+            [this, i](float value) {
+                onFloatRangeSliderLowerValueChanged(
+                    static_cast<Axis>(i), value);
+            });
+
+        connect(
+            mFloatSliders[i],
+            &FloatRangeSlider::upperValueChanged,
+            [this, i](float value) {
+                onFloatRangeSliderUpperValueChanged(
+                    static_cast<Axis>(i), value);
+            });
+
+        connect(
+            mMinSpinBoxes[i],
+            &QDoubleSpinBox::valueChanged,
+            [this, i](double value) {
+                onMinSpinBoxValueChanged(static_cast<Axis>(i), value);
+            });
+
+        connect(
+            mMaxSpinBoxes[i],
+            &QDoubleSpinBox::valueChanged,
+            [this, i](double value) {
+                onMaxSpinBoxValueChanged(static_cast<Axis>(i), value);
+            });
+    }
 }
 
 CrossSectionSettingsFrame::CrossSectionSettingsFrame(QWidget* parent) :
@@ -114,14 +135,16 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
     auto l = mCSS.lower();
     auto u = mCSS.upper();
 
-    updateSlider(
-        mUI->xFloatRangeSlider,
-        mUI->xMinSpinBox,
-        mUI->xMaxSpinBox,
-        bb.min().x(),
-        bb.max().x(),
-        l.x(),
-        u.x());
+    for (uint i = X; i < AXIS_COUNT; ++i) {
+        updateSlider(
+            mFloatSliders[i],
+            mMinSpinBoxes[i],
+            mMaxSpinBoxes[i],
+            bb.min()[i],
+            bb.max()[i],
+            l[i],
+            u[i]);
+    }
 
     // checkbox, last thing to do
     if (mCSS.type() == NONE)
@@ -202,44 +225,44 @@ void CrossSectionSettingsFrame::onPerFragmentToggled(bool checked)
     }
 }
 
-void CrossSectionSettingsFrame::onXFloatRangeSliderLowerValueChanged(
-    float value)
+void CrossSectionSettingsFrame::onFloatRangeSliderLowerValueChanged(
+    Axis axis, float value)
 {
     auto l = mCSS.lower();
-    l.x() = value;
+    l[axis] = value;
     mCSS.setLower(l);
 
-    mUI->xMinSpinBox->blockSignals(true);
-    mUI->xMinSpinBox->setValue(value);
-    mUI->xMinSpinBox->blockSignals(false);
-    mUI->xMaxSpinBox->setMinimum(value);
+    mMinSpinBoxes[axis]->blockSignals(true);
+    mMinSpinBoxes[axis]->setValue(value);
+    mMinSpinBoxes[axis]->blockSignals(false);
+    mMaxSpinBoxes[axis]->setMinimum(value);
 
     emit crossSectionSettingsUpdated();
 }
 
-void CrossSectionSettingsFrame::onXFloatRangeSliderUpperValueChanged(
-    float value)
+void CrossSectionSettingsFrame::onFloatRangeSliderUpperValueChanged(
+    Axis axis, float value)
 {
     auto u = mCSS.upper();
-    u.x() = value;
+    u[axis] = value;
     mCSS.setUpper(u);
 
-    mUI->xMaxSpinBox->blockSignals(true);
-    mUI->xMaxSpinBox->setValue(value);
-    mUI->xMaxSpinBox->blockSignals(false);
-    mUI->xMinSpinBox->setMaximum(value);
+    mMaxSpinBoxes[axis]->blockSignals(true);
+    mMaxSpinBoxes[axis]->setValue(value);
+    mMaxSpinBoxes[axis]->blockSignals(false);
+    mMinSpinBoxes[axis]->setMaximum(value);
 
     emit crossSectionSettingsUpdated();
 }
 
-void CrossSectionSettingsFrame::onXMinSpinBoxValueChanged(double value)
+void CrossSectionSettingsFrame::onMinSpinBoxValueChanged(Axis axis, double value)
 {
-    mUI->xFloatRangeSlider->setLowerValue(static_cast<float>(value));
+    mFloatSliders[axis]->setLowerValue(static_cast<float>(value));
 }
 
-void CrossSectionSettingsFrame::onXMaxSpinBoxValueChanged(double value)
+void CrossSectionSettingsFrame::onMaxSpinBoxValueChanged(Axis axis, double value)
 {
-    mUI->xFloatRangeSlider->setUpperValue(static_cast<float>(value));
+    mFloatSliders[axis]->setUpperValue(static_cast<float>(value));
 }
 
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index b4e886d97f..c7f73e816d 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -89,6 +89,19 @@
          <property name="bottomMargin">
           <number>0</number>
          </property>
+         <item row="0" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="xFloatRangeSlider" native="true">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+         <item row="5" column="1">
+          <widget class="QDoubleSpinBox" name="zMinSpinBox"/>
+         </item>
          <item row="1" column="1">
           <widget class="QDoubleSpinBox" name="xMinSpinBox">
            <property name="sizePolicy">
@@ -102,7 +115,10 @@
            </property>
           </widget>
          </item>
-         <item row="2" column="0">
+         <item row="3" column="1">
+          <widget class="QDoubleSpinBox" name="yMinSpinBox"/>
+         </item>
+         <item row="2" column="0" rowspan="2">
           <widget class="QLabel" name="yLabel">
            <property name="sizePolicy">
             <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
@@ -115,19 +131,22 @@
            </property>
           </widget>
          </item>
-         <item row="3" column="0">
-          <widget class="QLabel" name="zLabel">
+         <item row="1" column="2">
+          <widget class="QDoubleSpinBox" name="xMaxSpinBox">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="text">
-            <string>Z:</string>
+           <property name="singleStep">
+            <double>0.010000000000000</double>
            </property>
           </widget>
          </item>
+         <item row="2" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="yFloatRangeSlider" native="true"/>
+         </item>
          <item row="0" column="0" rowspan="2">
           <widget class="QLabel" name="xLabel">
            <property name="sizePolicy">
@@ -141,28 +160,27 @@
            </property>
           </widget>
          </item>
-         <item row="1" column="2">
-          <widget class="QDoubleSpinBox" name="xMaxSpinBox">
+         <item row="4" column="0" rowspan="2">
+          <widget class="QLabel" name="zLabel">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="singleStep">
-            <double>0.010000000000000</double>
+           <property name="text">
+            <string>Z:</string>
            </property>
           </widget>
          </item>
-         <item row="0" column="1" colspan="2">
-          <widget class="vcl::qt::FloatRangeSlider" name="xFloatRangeSlider" native="true">
-           <property name="sizePolicy">
-            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
-             <horstretch>0</horstretch>
-             <verstretch>0</verstretch>
-            </sizepolicy>
-           </property>
-          </widget>
+         <item row="4" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="zFloatRangeSlider" native="true"/>
+         </item>
+         <item row="3" column="2">
+          <widget class="QDoubleSpinBox" name="yMaxSpinBox"/>
+         </item>
+         <item row="5" column="2">
+          <widget class="QDoubleSpinBox" name="zMaxSpinBox"/>
          </item>
         </layout>
        </widget>

From efdaa00ed83bae1a0403021d178671987f924af4 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 10 Apr 2026 14:54:43 +0200
Subject: [PATCH 14/49] [render] Refactor cross-section discard logic into
 reusable shader macros

---
 .../drawable_mesh/surface/fs_surface_uber.sc  | 12 +-----
 .../drawable_mesh/surface/vs_surface.sc       | 11 +-----
 .../uniforms/cross_section_uniforms.sh        | 39 +++++++++++++++++++
 3 files changed, 41 insertions(+), 21 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
index 3c2121492c..7764af51ec 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
@@ -34,17 +34,7 @@ BUFFER_RO(primitiveNormals, float, VCL_MRB_PRIMITIVE_NORMAL_BUFFER); // normal o
 
 void main()
 {
-    if (v_discardFlag > 0.0) { // if vertex is marked as discard, discard the fragment
-        discard;
-    }
-
-    // discard the fragment if it is outside the cross-section box
-    if (v_worldPos.x < u_crossSectionMinX || v_worldPos.x > u_crossSectionMaxX ||
-            v_worldPos.y < u_crossSectionMinY || v_worldPos.y > u_crossSectionMaxY ||
-            v_worldPos.z < u_crossSectionMinZ || v_worldPos.z > u_crossSectionMaxZ)
-    {
-        discard;
-    }
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
 
     // depth offset - avoid z-fighting
     float depthOffset = 0.0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
index d54570be1d..603c968ddf 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
@@ -41,14 +41,5 @@ void main()
     v_color = a_color0;
 
     // discard flag - used to discard the whole vertex, but in fragment shader
-    if (!u_crossSectionPerFragment) {
-        bool isOutside = v_worldPos.x < u_crossSectionMinX || v_worldPos.x > u_crossSectionMaxX ||
-            v_worldPos.y < u_crossSectionMinY || v_worldPos.y > u_crossSectionMaxY ||
-            v_worldPos.z < u_crossSectionMinZ || v_worldPos.z > u_crossSectionMaxZ;
-
-        v_discardFlag = isOutside ? 1.0 : 0.0;
-    }
-    else {
-        v_discardFlag = 0.0; // no discard
-    }
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh b/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
index ce08426eda..f11a5bb1a8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh
@@ -36,4 +36,43 @@ uniform vec4 u_crossSectionMaxData;
 #define u_crossSectionMaxY u_crossSectionMaxData.y
 #define u_crossSectionMaxZ u_crossSectionMaxData.z
 
+/**
+ * Given the world position of the vertex, compute and returns the discard flag
+ * for the cross section test (1.0 if vertex should be discarded, 0.0 otherwise)
+ *
+ * This macro is meant to be used in the vertex shader. The result of this test
+ * can be passed to the fragment shader as a varying, so that the fragment
+ * shader can also discard fragments based on the same test
+ *
+ * pos: the world position of the vertex (vec3)
+ * returns: the discard flag (float)
+ */
+#define computeDiscardFlag(pos) ( \
+    (!u_crossSectionPerFragment && ( \
+        (pos).x < u_crossSectionMinX || (pos).x > u_crossSectionMaxX || \
+        (pos).y < u_crossSectionMinY || (pos).y > u_crossSectionMaxY || \
+        (pos).z < u_crossSectionMinZ || (pos).z > u_crossSectionMaxZ \
+    )) ? 1.0 : 0.0 \
+)
+
+/**
+ * Given the discard flag computed by computeDiscardFlag and the world position
+ * of the fragment, discard the fragment if the flag is greater than 0.0 or if
+ * the fragment is outside the cross section bounds (if
+ * u_crossSectionPerFragment is true).
+ *
+ * This macro is meant to be used in the fragment shader.
+ *
+ * flag: the discard flag computed by computeDiscardFlag and passed as a varying
+ *       from the vertex shader (float)
+ * pos: the world position of the fragment (vec3)
+ */
+#define discardIfCrossSectionClipped(flag, pos) \
+    if (flag > 0.0) discard; \
+    else if (u_crossSectionPerFragment && ( \
+        (pos).x < u_crossSectionMinX || (pos).x > u_crossSectionMaxX || \
+        (pos).y < u_crossSectionMinY || (pos).y > u_crossSectionMaxY || \
+        (pos).z < u_crossSectionMinZ || (pos).z > u_crossSectionMaxZ \
+    )) discard;
+
 #endif // VCL_EXT_BGFX_UNIFORMS_CROSS_SECTION_UNIFORMS_SH

From e6e2f7b9e85fb9ccbc17958e44a86dcb9a524fe1 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 10 Apr 2026 15:30:29 +0200
Subject: [PATCH 15/49] [render] Add cross-section clipping to mesh surface pbr
 and surface ID shaders

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h        | 13 ++++++++++++-
 .../drawable_mesh/surface/fs_surface_uber_pbr.sc    |  7 +++++--
 .../drawable_mesh/surface/surface_uber_in.sh        |  6 ++++--
 .../drawable_mesh/surface_id/fs_surface_id.sc       |  5 +++++
 .../drawable_mesh/surface_id/varying.def.sc         |  5 ++++-
 .../drawable_mesh/surface_id/vs_surface_id.sc       |  7 +++++++
 6 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index 1b95a99026..f45e3d1a51 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -228,7 +228,6 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         else {
             CrossSectionUniforms::set();
         }
-        CrossSectionUniforms::bind();
 
         if (mMRS.isSurface(MRI::Surface::VISIBLE)) {
             const PBRViewerSettings&   pbrSettings = settings.pbrSettings;
@@ -351,6 +350,17 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
             model = MeshType::transformMatrix().template cast<float>();
         }
 
+        if (AbstractDrawableMesh::mCSS.isEnabled()) {
+            using enum CrossSectionSettings::CrossSectionType;
+            CrossSectionUniforms::set(
+                AbstractDrawableMesh::mCSS.lower(),
+                AbstractDrawableMesh::mCSS.upper(),
+                AbstractDrawableMesh::mCSS.type() == PER_FRAGMENT);
+        }
+        else {
+            CrossSectionUniforms::set();
+        }
+
         if (mMRS.isSurface(MRI::Surface::VISIBLE)) {
             mMRB.bindVertexBuffers(mMRS);
             mMRB.bindIndexBuffers(mMRS);
@@ -440,6 +450,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
     {
         MeshRenderSettingsUniforms::bind();
         DrawableMeshUniforms::bind();
+        CrossSectionUniforms::bind();
     }
 
     /**
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
index b9e0989ded..b25bd18c26 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
@@ -22,14 +22,15 @@
 
 $input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
+#include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
+
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/drawable_mesh_texture_uniforms.sh>
 #include <vclib/bgfx/pbr_common.sh>
 
 #include <vclib/bgfx/drawers/uniforms/viewer_drawer_uniforms.sh>
 
-#include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
-
 #define primitiveID (u_firstChunkPrimitiveID + gl_PrimitiveID)
 
 BUFFER_RO(primitiveColors, uint, VCL_MRB_PRIMITIVE_COLOR_BUFFER);    // color of each face / edge
@@ -40,6 +41,8 @@ SAMPLERCUBE(s_specular, VCL_MRB_CUBEMAP1);
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     // texcoord to use
     bool useTexture =
         bool(u_surfaceMode & posToBitFlag(VCL_MRS_SURF_TEX_VERTEX)) ||
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
index 00c8641fe3..787a8e8241 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
@@ -23,9 +23,9 @@
 $input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
-#include <vclib/bgfx/drawable/uniforms/drawable_mesh_texture_uniforms.sh>
-
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/drawable_mesh_texture_uniforms.sh>
 
 #define primitiveID (u_firstChunkPrimitiveID + gl_PrimitiveID)
 
@@ -34,6 +34,8 @@ BUFFER_RO(primitiveNormals, float, VCL_MRB_PRIMITIVE_NORMAL_BUFFER); // normal o
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     // depth offset - avoid z-fighting
     float depthOffset = 0.0;
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc
index e5f18faa30..b89bee2244 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc
@@ -20,12 +20,17 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
+$input v_worldPos, v_discardFlag
+
 #include <vclib/bgfx/shaders_common.sh>
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/drawable_mesh_uniforms.sh>
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     /***** render ID to color ******/
     vec4 color = uintABGRToVec4Color(u_meshId);
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
index 32f30d13a5..cbaadbb6fc 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
@@ -1 +1,4 @@
-vec3 a_position  : POSITION;
\ No newline at end of file
+vec3 a_position  : POSITION;
+
+vec3 v_worldPos     : TEXCOORD3; // unused texcoord semantic
+float v_discardFlag : TEXCOORD4; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc
index 7c3bf73d47..c5f39afd11 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc
@@ -21,10 +21,17 @@
  ****************************************************************************/
 
 $input a_position
+$output v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/shaders_common.sh>
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
+
 void main()
 {
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }

From cbf32a3e37dc71ac99c36cc5c4111a4dfbaf9204 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 10 Apr 2026 15:40:40 +0200
Subject: [PATCH 16/49] [render] DrawableMesh: Refactor cross-section uniform
 updates into updateCrossSectionUniforms()

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  | 39 +++++++++----------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index f45e3d1a51..ba55255192 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -218,16 +218,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         DrawableMeshUniforms::setColor(*this);
         MeshRenderSettingsUniforms::set(mMRS);
 
-        if (AbstractDrawableMesh::mCSS.isEnabled()) {
-            using enum CrossSectionSettings::CrossSectionType;
-            CrossSectionUniforms::set(
-                AbstractDrawableMesh::mCSS.lower(),
-                AbstractDrawableMesh::mCSS.upper(),
-                AbstractDrawableMesh::mCSS.type() == PER_FRAGMENT);
-        }
-        else {
-            CrossSectionUniforms::set();
-        }
+        updateCrossSectionUniforms();
 
         if (mMRS.isSurface(MRI::Surface::VISIBLE)) {
             const PBRViewerSettings&   pbrSettings = settings.pbrSettings;
@@ -260,6 +251,8 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
                 mMRB.bindIndexBuffers(mMRS, i);
 
                 /* UNIFORMS */
+                CrossSectionUniforms::bind();
+
                 DrawableMeshUniforms::setFirstChunkIndex(
                     mMRB.triangleChunk(i).startIndex);
                 uint64_t materialState =
@@ -350,16 +343,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
             model = MeshType::transformMatrix().template cast<float>();
         }
 
-        if (AbstractDrawableMesh::mCSS.isEnabled()) {
-            using enum CrossSectionSettings::CrossSectionType;
-            CrossSectionUniforms::set(
-                AbstractDrawableMesh::mCSS.lower(),
-                AbstractDrawableMesh::mCSS.upper(),
-                AbstractDrawableMesh::mCSS.type() == PER_FRAGMENT);
-        }
-        else {
-            CrossSectionUniforms::set();
-        }
+        updateCrossSectionUniforms();
 
         if (mMRS.isSurface(MRI::Surface::VISIBLE)) {
             mMRB.bindVertexBuffers(mMRS);
@@ -450,7 +434,20 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
     {
         MeshRenderSettingsUniforms::bind();
         DrawableMeshUniforms::bind();
-        CrossSectionUniforms::bind();
+    }
+
+    void updateCrossSectionUniforms() const
+    {
+        if (AbstractDrawableMesh::mCSS.isEnabled()) {
+            using enum CrossSectionSettings::CrossSectionType;
+            CrossSectionUniforms::set(
+                AbstractDrawableMesh::mCSS.lower(),
+                AbstractDrawableMesh::mCSS.upper(),
+                AbstractDrawableMesh::mCSS.type() == PER_FRAGMENT);
+        }
+        else {
+            CrossSectionUniforms::set();
+        }
     }
 
     /**

From c468fbdc0f1fcbc108b35bb28944dd796feb98f5 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 10 Apr 2026 16:01:05 +0200
Subject: [PATCH 17/49] [render] Add cross-section clipping support to
 points_instance shaders

---
 .../include/vclib/bgfx/drawable/drawable_mesh_bgfx.h      | 2 ++
 .../drawable_mesh/points_instance/fs_points_instance.sc   | 5 ++++-
 .../drawable/drawable_mesh/points_instance/varying.def.sc | 8 +++++---
 .../drawable_mesh/points_instance/vs_points_instance.sc   | 7 ++++++-
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index ba55255192..12d4917a8a 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -299,6 +299,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
                 // 1 px vertices
                 mMRB.bindVertexBuffers(mMRS);
                 bindUniforms();
+                CrossSectionUniforms::bind();
 
                 bgfx::setState(state | BGFX_STATE_PT_POINTS);
                 bgfx::setTransform(model.data());
@@ -314,6 +315,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
                 // render splats
                 mMRB.bindVertexQuadBuffer();
                 bindUniforms();
+                CrossSectionUniforms::bind();
 
                 bgfx::setState(state);
                 bgfx::setTransform(model.data());
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
index a85d5e9f0e..5941309da9 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
@@ -20,12 +20,15 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_normal, v_color, v_texcoord1
+$input v_worldPos, v_discardFlag, v_normal, v_color, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     // defaul color and light
     vec4 light = vec4(1, 1, 1, 1);
     vec4 color = uintABGRToVec4Color(floatBitsToUint(u_userPointColorFloat));
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
index 1fec272da6..0d3d60004f 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
@@ -2,6 +2,8 @@ vec3 a_position  : POSITION;
 vec4 a_color0    : COLOR0;
 vec3 a_normal    : NORMAL;
 
-vec3 v_normal    : NORMAL;
-vec4 v_color     : COLOR0;
-vec2 v_texcoord1 : TEXCOORD1;
+vec3 v_worldPos     : TEXCOORD3; // unused texcoord semantic
+float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+vec3 v_normal       : NORMAL;
+vec4 v_color        : COLOR0;
+vec2 v_texcoord1    : TEXCOORD1;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
index f48ec1419b..19c0bbd92c 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
@@ -21,9 +21,10 @@
  ****************************************************************************/
 
 $input a_position, a_color0, a_normal, a_texcoord0
-$output v_normal, v_color, v_texcoord1
+$output v_worldPos, v_discardFlag, v_normal, v_color, v_texcoord1
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
@@ -37,6 +38,7 @@ void main()
         (2.0 * quadUv.y - 1.0) * u_pointWidth * u_viewTexel.y, // is divided by 2
         0, 0);
 
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     pos = pos / pos.w;
     gl_Position = pos + offset;
     v_normal = normalize(mul(u_normalMatrix, a_normal));
@@ -46,4 +48,7 @@ void main()
 
     // quad parametrization
     v_texcoord1 = quadUv;
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }

From 72739a088fe95f074b6324b386d6caa65881ecf0 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Mon, 13 Apr 2026 10:05:22 +0200
Subject: [PATCH 18/49] [render] Move CrossSectionSettings from drawable/mesh
 to render/settings directory

---
 .../include/vclib/qt/gui/mesh_render_settings_frame.h       | 2 +-
 .../cross_section_settings_frame.h                          | 2 +-
 .../include/vclib/render/drawable/abstract_drawable_mesh.h  | 2 +-
 .../{drawable/mesh => settings}/cross_section_settings.h    | 6 +++---
 4 files changed, 6 insertions(+), 6 deletions(-)
 rename vclib/render/include/vclib/render/{drawable/mesh => settings}/cross_section_settings.h (95%)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
index 8938762374..c972c61240 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
@@ -25,8 +25,8 @@
 
 #include "mesh_render_settings_frame/generic_mesh_render_settings_frame.h"
 
-#include <vclib/render/drawable/mesh/cross_section_settings.h>
 #include <vclib/render/drawable/mesh/mesh_render_settings.h>
+#include <vclib/render/settings/cross_section_settings.h>
 
 #include <QFrame>
 
diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index ceddd08f82..63538fecbd 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -24,7 +24,7 @@
 #define VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_CROSS_SECTION_SETTINGS_FRAME_H
 
 #include <vclib/qt/gui/float_range_slider.h>
-#include <vclib/render/drawable/mesh/cross_section_settings.h>
+#include <vclib/render/settings/cross_section_settings.h>
 
 #include <QDoubleSpinBox>
 #include <QFrame>
diff --git a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
index 77644a5c78..4a824b4f75 100644
--- a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
+++ b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
@@ -24,9 +24,9 @@
 #define VCL_RENDER_DRAWABLE_ABSTRACT_DRAWABLE_MESH_H
 
 #include "drawable_object.h"
-#include "mesh/cross_section_settings.h"
 #include "mesh/mesh_render_settings.h"
 
+#include <vclib/render/settings/cross_section_settings.h>
 #include <vclib/space/core/matrix.h>
 
 namespace vcl {
diff --git a/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
similarity index 95%
rename from vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
rename to vclib/render/include/vclib/render/settings/cross_section_settings.h
index 2eef9000a0..8e98590b6e 100644
--- a/vclib/render/include/vclib/render/drawable/mesh/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -20,8 +20,8 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-#ifndef VCL_RENDER_DRAWABLE_MESH_CROSS_SECTION_SETTINGS_H
-#define VCL_RENDER_DRAWABLE_MESH_CROSS_SECTION_SETTINGS_H
+#ifndef VCL_RENDER_SETTINGS_CROSS_SECTION_SETTINGS_H
+#define VCL_RENDER_SETTINGS_CROSS_SECTION_SETTINGS_H
 
 #include <vclib/algorithms/mesh.h>
 #include <vclib/mesh.h>
@@ -105,4 +105,4 @@ class CrossSectionSettings
 
 } // namespace vcl
 
-#endif // VCL_RENDER_DRAWABLE_MESH_CROSS_SECTION_SETTINGS_H
+#endif // VCL_RENDER_SETTINGS_CROSS_SECTION_SETTINGS_H

From 81802a24f5c529a14e4e0d430ae4c8a1eee973c5 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Mon, 13 Apr 2026 12:26:24 +0200
Subject: [PATCH 19/49] [render] Add CrossSection clipping to lines

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  |  6 ++++
 .../bgfx/drawable/mesh/mesh_render_buffers.h  |  6 ++++
 .../include/vclib/bgfx/primitives/lines.h     | 28 +++++++++++++++++++
 .../render/drawable/abstract_drawable_mesh.h  | 10 +++----
 .../fs_cpu_generated_lines.sc                 | 10 +++++--
 .../lines/cpu_generated_lines/varying.def.sc  |  8 ++++--
 .../vs_cpu_generated_lines.sc                 | 12 +++++++-
 7 files changed, 69 insertions(+), 11 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index 12d4917a8a..6bb4a1fca5 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -148,6 +148,12 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         mMRB.updateWireframeSettings(rs);
     }
 
+    void setCrossSectionSettings(const CrossSectionSettings& css) override
+    {
+        AbstractDrawableMesh::setCrossSectionSettings(css);
+        mMRB.updateCrossSectionSettings(css);
+    }
+
     uint vertexCount() const override { return MeshType::vertexCount(); }
 
     uint faceCount() const override
diff --git a/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h b/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
index cbb52a708c..185e478ba0 100644
--- a/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
+++ b/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
@@ -326,6 +326,12 @@ class MeshRenderBuffers : public MeshRenderData<MeshRenderBuffers<Mesh>>
         }
     }
 
+    void updateCrossSectionSettings(const CrossSectionSettings& css)
+    {
+        mEdgeLines.crossSectionSettings() = css;
+        mWireframeLines.crossSectionSettings() = css;
+    }
+
 private:
     void setVertexPositionsBuffer(const MeshType& mesh) // override
     {
diff --git a/vclib/render/include/vclib/bgfx/primitives/lines.h b/vclib/render/include/vclib/bgfx/primitives/lines.h
index 08e955b03b..9b0d7a7cdb 100644
--- a/vclib/render/include/vclib/bgfx/primitives/lines.h
+++ b/vclib/render/include/vclib/bgfx/primitives/lines.h
@@ -23,10 +23,13 @@
 #ifndef VCL_BGFX_PRIMITIVES_LINES_H
 #define VCL_BGFX_PRIMITIVES_LINES_H
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.h>
 #include <vclib/bgfx/primitives/lines/cpu_generated_lines.h>
 #include <vclib/bgfx/primitives/lines/primitive_lines.h>
 #include <vclib/bgfx/uniform.h>
 
+#include <vclib/render/settings/cross_section_settings.h>
+
 #include <vclib/base.h>
 #include <vclib/space/core.h>
 
@@ -90,6 +93,8 @@ class Lines
     ColorToUse mColorToUse      = ColorToUse::GENERAL;
     Color      mGeneralColor    = Color::ColorABGR::LightGray;
 
+    CrossSectionSettings mCrossSectionSettings;
+
     ImplementationType mType = ImplementationType::COUNT;
 
     std::variant<detail::PrimitiveLines, detail::CPUGeneratedLines>
@@ -385,6 +390,16 @@ class Lines
      */
     Color& generalColor() { return mGeneralColor; }
 
+    CrossSectionSettings crossSectionSettings() const
+    {
+        return mCrossSectionSettings;
+    }
+
+    CrossSectionSettings& crossSectionSettings()
+    {
+        return mCrossSectionSettings;
+    }
+
     /**
      * @brief Returns the current implementation type that is used to render
      * the lines.
@@ -533,6 +548,19 @@ class Lines
             std::bit_cast<float>(mGeneralColor.abgr()),
             mDepthOffset};
         sSettingUH.bind(data);
+
+        // cross section settings
+        if (mCrossSectionSettings.isEnabled()) {
+            using enum CrossSectionSettings::CrossSectionType;
+            CrossSectionUniforms::set(
+                mCrossSectionSettings.lower(),
+                mCrossSectionSettings.upper(),
+                mCrossSectionSettings.type() == PER_FRAGMENT);
+        }
+        else {
+            CrossSectionUniforms::set();
+        }
+        CrossSectionUniforms::bind();
     }
 };
 
diff --git a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
index 4a824b4f75..006521b8af 100644
--- a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
+++ b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
@@ -68,17 +68,17 @@ class AbstractDrawableMesh : public vcl::DrawableObject
 
     const CrossSectionSettings& crossSectionSettings() const { return mCSS; }
 
-    void setCrossSectionSettings(const CrossSectionSettings& css)
-    {
-        mCSS = css;
-    }
-
     virtual void updateBuffers(
         MeshRenderInfo::BuffersBitSet buffersToUpdate =
             MeshRenderInfo::BUFFERS_ALL) = 0;
 
     virtual void setRenderSettings(const MeshRenderSettings& rs) { mMRS = rs; }
 
+    virtual void setCrossSectionSettings(const CrossSectionSettings& css)
+    {
+        mCSS = css;
+    }
+
     virtual uint vertexCount() const = 0;
 
     virtual uint faceCount() const = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc
index eaf0f9fbb3..2100579769 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc
@@ -20,8 +20,9 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_color, v_normal
+$input v_worldPos0, v_worldPos1, v_discardFlag, v_t, v_color, v_normal
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/directional_light_uniforms.sh>
 #include <vclib/bgfx/primitives/lines/uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh> 
@@ -35,11 +36,14 @@ BUFFER_RO(edgesColors, uint, 0);
 #define vertexColor  v_color
 
 void main() {
+    vec3 fragPos = mix(v_worldPos0, v_worldPos1, v_t);
+    discardIfCrossSectionClipped(v_discardFlag, fragPos);
+
     vec4 color;
     if (colorToUse == 0)        color = vertexColor;
     else if (colorToUse == 1)   color = edgeColor;
-    else                        color = generalColor;    
-    
+    else                        color = generalColor;
+
     if (u_shadingPerVertex) {
         color *= computeLight(u_lightDir, u_lightColor, v_normal);
     }
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
index 4de0fe029d..1e671a7a68 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
@@ -5,5 +5,9 @@ vec4 a_color1    : COLOR1;    // c1
 vec3 a_normal    : NORMAL;    // n0
 vec3 a_texcoord1 : TEXCOORD1; // n1
 
-vec4 v_color     : COLOR0;
-vec3 v_normal    : NORMAL;
+vec4 v_color        : COLOR0;
+vec3 v_normal       : NORMAL;
+vec3 v_worldPos0    : TEXCOORD2; // unused texcoord semantic
+vec3 v_worldPos1    : TEXCOORD3; // unused texcoord semantic
+float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+float v_t           : TEXCOORD5; // interpolation parameter along segment
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
index 2859e6275a..18d59b5edc 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
@@ -21,11 +21,12 @@
  ****************************************************************************/
 
 $input a_position, a_texcoord0, a_color0, a_color1, a_normal, a_texcoord1
-$output v_color, v_normal
+$output v_worldPos0, v_worldPos1, v_discardFlag, v_t, v_color, v_normal
 
 #include <bgfx_shader.sh>
 #include <bgfx_compute.sh>
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/primitives/lines/uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh> 
 
@@ -48,6 +49,9 @@ void main() {
     int generalIndex = gl_VertexID % 4;
     vec2 uv = vec2((generalIndex >> 1) & 0x1, generalIndex & 0x1);
 
+    v_worldPos0 = mul(u_model[0], vec4(p0, 1.0)).xyz;
+    v_worldPos1 = mul(u_model[0], vec4(p1, 1.0)).xyz;
+
     // segment points in clip space
     vec4 p0_NDC = mul(u_modelViewProj, vec4(p0, 1.0));
     vec4 p1_NDC = mul(u_modelViewProj, vec4(p1, 1.0));
@@ -108,7 +112,13 @@ void main() {
 
     v_color = color;
     v_normal = normal;
+    v_t = uv.x;
     // nudge towards camera to avoid z-fighting with other geometry
     p.z += -u_depthOffset * p.w;
     gl_Position = p;
+
+    // discard flag - 1.0 if either endpoint is outside the cross section
+    // (only used in per-vertex mode; in per-fragment mode computeDiscardFlag returns 0.0)
+    v_discardFlag =
+        max(computeDiscardFlag(v_worldPos0), computeDiscardFlag(v_worldPos1));
 }

From 42cb29beb613bc1705d6e05de4c7addad5420c6c Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Mon, 13 Apr 2026 14:54:05 +0200
Subject: [PATCH 20/49] [render] Move CrossSectionSettingsFrame to tab widget
 and update UI structure

---
 .../vclib/qt/gui/mesh_render_settings_frame.h |   4 +-
 .../qt/gui/mesh_render_settings_frame.cpp     |  21 ++--
 .../qt/gui/mesh_render_settings_frame.ui      |  18 ---
 .../cross_section_settings_frame.ui           | 104 ++++++++++++------
 4 files changed, 84 insertions(+), 63 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
index c972c61240..fd9df70e3e 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
@@ -23,6 +23,7 @@
 #ifndef VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_H
 #define VCL_QT_GUI_MESH_RENDER_SETTINGS_FRAME_H
 
+#include "mesh_render_settings_frame/cross_section_settings_frame.h"
 #include "mesh_render_settings_frame/generic_mesh_render_settings_frame.h"
 
 #include <vclib/render/drawable/mesh/mesh_render_settings.h>
@@ -45,7 +46,8 @@ class MeshRenderSettingsFrame : public QFrame
     Ui::MeshRenderSettingsFrame* mUI;
     MeshRenderSettings           mMRS;
 
-    std::vector<GenericMeshRenderSettingsFrame*> frames;
+    std::vector<GenericMeshRenderSettingsFrame*> mFrames;
+    CrossSectionSettingsFrame*                   mCrossSectionFrame;
 
 public:
     explicit MeshRenderSettingsFrame(QWidget* parent = nullptr);
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
index c0129cbd77..7bc116ad3f 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.cpp
@@ -41,21 +41,21 @@ MeshRenderSettingsFrame::MeshRenderSettingsFrame(QWidget* parent) :
 
     auto* pointsFrame = new PointsFrame(mMRS, this);
     mUI->tabWidget->addTab(pointsFrame, "Points");
-    frames.push_back(pointsFrame);
+    mFrames.push_back(pointsFrame);
 
     auto* surfaceFrame = new SurfaceFrame(mMRS, this);
     mUI->tabWidget->addTab(surfaceFrame, "Surface");
-    frames.push_back(surfaceFrame);
+    mFrames.push_back(surfaceFrame);
 
     auto* wireframeFrame = new WireframeFrame(mMRS, this);
     mUI->tabWidget->addTab(wireframeFrame, "Wireframe");
-    frames.push_back(wireframeFrame);
+    mFrames.push_back(wireframeFrame);
 
     auto* edgesFrame = new EdgesFrame(mMRS, this);
     mUI->tabWidget->addTab(edgesFrame, "Edges");
-    frames.push_back(edgesFrame);
+    mFrames.push_back(edgesFrame);
 
-    for (auto* frame : frames) {
+    for (auto* frame : mFrames) {
         connect(
             frame,
             SIGNAL(meshRenderSettingsUpdated()),
@@ -63,8 +63,11 @@ MeshRenderSettingsFrame::MeshRenderSettingsFrame(QWidget* parent) :
             SIGNAL(meshRenderSettingsUpdated()));
     }
 
+    mCrossSectionFrame = new CrossSectionSettingsFrame(this);
+    mUI->tabWidget->addTab(mCrossSectionFrame, "Cross Section");
+
     connect(
-        mUI->crossSectionFrame,
+        mCrossSectionFrame,
         SIGNAL(crossSectionSettingsUpdated()),
         this,
         SIGNAL(crossSectionSettingsUpdated()));
@@ -83,7 +86,7 @@ const MeshRenderSettings& MeshRenderSettingsFrame::meshRenderSettings() const
 const CrossSectionSettings& MeshRenderSettingsFrame::crossSectionSettings()
     const
 {
-    return mUI->crossSectionFrame->crossSectionSettings();
+    return mCrossSectionFrame->crossSectionSettings();
 }
 
 void MeshRenderSettingsFrame::setMeshRenderSettings(
@@ -97,14 +100,14 @@ void MeshRenderSettingsFrame::setMeshRenderSettings(
 void MeshRenderSettingsFrame::setCrossSectionSettings(
     const CrossSectionSettings& settings)
 {
-    mUI->crossSectionFrame->setCrossSectionSettings(settings);
+    mCrossSectionFrame->setCrossSectionSettings(settings);
 }
 
 void MeshRenderSettingsFrame::updateGuiFromSettings(bool changeCurrentTab)
 {
     using MRI = MeshRenderInfo;
 
-    for (auto* frame : frames) {
+    for (auto* frame : mFrames) {
         frame->updateFrameFromSettings();
     }
 
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
index 6eefbd7d3e..a660187262 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame.ui
@@ -27,26 +27,8 @@
      </property>
     </widget>
    </item>
-   <item row="1" column="0">
-    <widget class="vcl::qt::CrossSectionSettingsFrame" name="crossSectionFrame">
-     <property name="frameShape">
-      <enum>QFrame::Shape::NoFrame</enum>
-     </property>
-     <property name="frameShadow">
-      <enum>QFrame::Shadow::Plain</enum>
-     </property>
-    </widget>
-   </item>
   </layout>
  </widget>
- <customwidgets>
-  <customwidget>
-   <class>vcl::qt::CrossSectionSettingsFrame</class>
-   <extends>QFrame</extends>
-   <header>vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h</header>
-   <container>1</container>
-  </customwidget>
- </customwidgets>
  <resources/>
  <connections/>
 </ui>
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index c7f73e816d..8428ce13b0 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -89,21 +89,30 @@
          <property name="bottomMargin">
           <number>0</number>
          </property>
-         <item row="0" column="1" colspan="2">
-          <widget class="vcl::qt::FloatRangeSlider" name="xFloatRangeSlider" native="true">
+         <item row="4" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="yFloatRangeSlider" native="true"/>
+         </item>
+         <item row="7" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="zFloatRangeSlider" native="true"/>
+         </item>
+         <item row="5" column="1">
+          <widget class="QDoubleSpinBox" name="yMinSpinBox"/>
+         </item>
+         <item row="2" column="1">
+          <widget class="QDoubleSpinBox" name="xMinSpinBox">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
           </widget>
          </item>
-         <item row="5" column="1">
-          <widget class="QDoubleSpinBox" name="zMinSpinBox"/>
-         </item>
-         <item row="1" column="1">
-          <widget class="QDoubleSpinBox" name="xMinSpinBox">
+         <item row="2" column="2">
+          <widget class="QDoubleSpinBox" name="xMaxSpinBox">
            <property name="sizePolicy">
             <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
              <horstretch>0</horstretch>
@@ -115,10 +124,14 @@
            </property>
           </widget>
          </item>
-         <item row="3" column="1">
-          <widget class="QDoubleSpinBox" name="yMinSpinBox"/>
+         <item row="0" column="0" colspan="3">
+          <widget class="Line" name="xLine">
+           <property name="orientation">
+            <enum>Qt::Orientation::Horizontal</enum>
+           </property>
+          </widget>
          </item>
-         <item row="2" column="0" rowspan="2">
+         <item row="4" column="0" rowspan="2">
           <widget class="QLabel" name="yLabel">
            <property name="sizePolicy">
             <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
@@ -131,37 +144,47 @@
            </property>
           </widget>
          </item>
-         <item row="1" column="2">
-          <widget class="QDoubleSpinBox" name="xMaxSpinBox">
+         <item row="7" column="0" rowspan="2">
+          <widget class="QLabel" name="zLabel">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
+            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="singleStep">
-            <double>0.010000000000000</double>
+           <property name="text">
+            <string>Z:</string>
            </property>
           </widget>
          </item>
-         <item row="2" column="1" colspan="2">
-          <widget class="vcl::qt::FloatRangeSlider" name="yFloatRangeSlider" native="true"/>
+         <item row="8" column="1">
+          <widget class="QDoubleSpinBox" name="zMinSpinBox"/>
          </item>
-         <item row="0" column="0" rowspan="2">
-          <widget class="QLabel" name="xLabel">
+         <item row="8" column="2">
+          <widget class="QDoubleSpinBox" name="zMaxSpinBox"/>
+         </item>
+         <item row="5" column="2">
+          <widget class="QDoubleSpinBox" name="yMaxSpinBox"/>
+         </item>
+         <item row="3" column="0" colspan="3">
+          <widget class="Line" name="yLine">
+           <property name="orientation">
+            <enum>Qt::Orientation::Horizontal</enum>
+           </property>
+          </widget>
+         </item>
+         <item row="1" column="1" colspan="2">
+          <widget class="vcl::qt::FloatRangeSlider" name="xFloatRangeSlider" native="true">
            <property name="sizePolicy">
-            <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+            <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
              <horstretch>0</horstretch>
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="text">
-            <string>X:</string>
-           </property>
           </widget>
          </item>
-         <item row="4" column="0" rowspan="2">
-          <widget class="QLabel" name="zLabel">
+         <item row="1" column="0" rowspan="2">
+          <widget class="QLabel" name="xLabel">
            <property name="sizePolicy">
             <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
              <horstretch>0</horstretch>
@@ -169,18 +192,16 @@
             </sizepolicy>
            </property>
            <property name="text">
-            <string>Z:</string>
+            <string>X:</string>
            </property>
           </widget>
          </item>
-         <item row="4" column="1" colspan="2">
-          <widget class="vcl::qt::FloatRangeSlider" name="zFloatRangeSlider" native="true"/>
-         </item>
-         <item row="3" column="2">
-          <widget class="QDoubleSpinBox" name="yMaxSpinBox"/>
-         </item>
-         <item row="5" column="2">
-          <widget class="QDoubleSpinBox" name="zMaxSpinBox"/>
+         <item row="6" column="0" colspan="3">
+          <widget class="Line" name="zLine">
+           <property name="orientation">
+            <enum>Qt::Orientation::Horizontal</enum>
+           </property>
+          </widget>
          </item>
         </layout>
        </widget>
@@ -188,6 +209,19 @@
      </layout>
     </widget>
    </item>
+   <item row="2" column="0">
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Orientation::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
   </layout>
  </widget>
  <customwidgets>

From 88eb9672b801080e4b02630fb7e05ed7a98e6eab Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Mon, 13 Apr 2026 15:15:35 +0200
Subject: [PATCH 21/49] [render] separate cross section inputs/outputs in all
 the shaders

---
 .../render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h  | 5 +----
 .../drawable_mesh/points_instance/fs_points_instance.sc      | 5 ++++-
 .../drawable/drawable_mesh/points_instance/varying.def.sc    | 5 +++--
 .../drawable_mesh/points_instance/vs_points_instance.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_flat_color_face.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_flat_color_mesh.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_flat_color_user.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_flat_color_vertex.sc    | 5 ++++-
 .../drawable_mesh/surface/fs_surface_flat_tex_vertex.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_flat_tex_wedge.sc       | 5 ++++-
 .../drawable_mesh/surface/fs_surface_none_color_face.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_none_color_mesh.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_none_color_user.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_none_color_vertex.sc    | 5 ++++-
 .../drawable_mesh/surface/fs_surface_none_tex_vertex.sc      | 5 ++++-
 .../drawable_mesh/surface/fs_surface_none_tex_wedge.sc       | 5 ++++-
 .../drawable_mesh/surface/fs_surface_smooth_color_face.sc    | 5 ++++-
 .../drawable_mesh/surface/fs_surface_smooth_color_mesh.sc    | 5 ++++-
 .../drawable_mesh/surface/fs_surface_smooth_color_user.sc    | 5 ++++-
 .../drawable_mesh/surface/fs_surface_smooth_color_vertex.sc  | 5 ++++-
 .../drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc    | 5 ++++-
 .../drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc     | 5 ++++-
 .../bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc   | 5 ++++-
 .../drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc    | 5 ++++-
 .../bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh   | 5 ++++-
 .../vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc | 5 +++--
 .../vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc  | 5 ++++-
 .../bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc  | 1 +
 .../bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc  | 2 ++
 .../lines/cpu_generated_lines/fs_cpu_generated_lines.sc      | 5 ++++-
 .../bgfx/primitives/lines/cpu_generated_lines/varying.def.sc | 3 ++-
 .../lines/cpu_generated_lines/vs_cpu_generated_lines.sc      | 5 ++++-
 32 files changed, 116 insertions(+), 35 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index 6bb4a1fca5..0b67c5d354 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -257,8 +257,6 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
                 mMRB.bindIndexBuffers(mMRS, i);
 
                 /* UNIFORMS */
-                CrossSectionUniforms::bind();
-
                 DrawableMeshUniforms::setFirstChunkIndex(
                     mMRB.triangleChunk(i).startIndex);
                 uint64_t materialState =
@@ -305,7 +303,6 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
                 // 1 px vertices
                 mMRB.bindVertexBuffers(mMRS);
                 bindUniforms();
-                CrossSectionUniforms::bind();
 
                 bgfx::setState(state | BGFX_STATE_PT_POINTS);
                 bgfx::setTransform(model.data());
@@ -321,7 +318,6 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
                 // render splats
                 mMRB.bindVertexQuadBuffer();
                 bindUniforms();
-                CrossSectionUniforms::bind();
 
                 bgfx::setState(state);
                 bgfx::setTransform(model.data());
@@ -442,6 +438,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
     {
         MeshRenderSettingsUniforms::bind();
         DrawableMeshUniforms::bind();
+        CrossSectionUniforms::bind();
     }
 
     void updateCrossSectionUniforms() const
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
index 5941309da9..606946edae 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
@@ -20,7 +20,10 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_worldPos, v_discardFlag, v_normal, v_color, v_texcoord1
+$input v_normal, v_color, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
index 0d3d60004f..ee363e7dc6 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
@@ -2,8 +2,9 @@ vec3 a_position  : POSITION;
 vec4 a_color0    : COLOR0;
 vec3 a_normal    : NORMAL;
 
-vec3 v_worldPos     : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
 vec3 v_normal       : NORMAL;
 vec4 v_color        : COLOR0;
 vec2 v_texcoord1    : TEXCOORD1;
+
+vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
+float v_discardFlag : TEXCOORD4; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
index 19c0bbd92c..1222a3fb64 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
@@ -21,7 +21,10 @@
  ****************************************************************************/
 
 $input a_position, a_color0, a_normal, a_texcoord0
-$output v_worldPos, v_discardFlag, v_normal, v_color, v_texcoord1
+$output v_normal, v_color, v_texcoord1
+
+// cross section
+$output v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
index 59715944b0..d46c8a2af4 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "flat.sh"
 #include "color_face.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
index e82658be79..c2da6fc330 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "flat.sh"
 #include "color_mesh.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
index 28e612c6de..efe2774f3d 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "flat.sh"
 #include "color_user.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
index 075b1dedf2..55935ba1f9 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "flat.sh"
 #include "color_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
index a08e2d66e1..7ff513c9b0 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "flat.sh"
 #include "tex_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
index ca01b58446..11c3ff4dfc 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "flat.sh"
 #include "tex_wedge.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
index f1da27f761..13d3dbe4cd 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "none.sh"
 #include "color_face.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
index 816ffef4bb..c8fd419b50 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "none.sh"
 #include "color_mesh.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
index 16a97f8b41..3bdc461d4d 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "none.sh"
 #include "color_user.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
index e5779a82ee..ceda415289 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "none.sh"
 #include "color_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
index 730cb527db..8f20ac1903 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "none.sh"
 #include "tex_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
index 3255e57a5d..2757ef4b3f 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "none.sh"
 #include "tex_wedge.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
index 75db62cd07..db9605af55 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "smooth.sh"
 #include "color_face.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
index 3c1b47a1c4..dcacfc7b15 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "smooth.sh"
 #include "color_mesh.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
index 928c90292b..7aeb11d1c1 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "smooth.sh"
 #include "color_user.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
index 79a328a218..40e456f3c8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "smooth.sh"
 #include "color_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
index 7780305822..2a5da58c93 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "smooth.sh"
 #include "tex_vertex.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
index 136b595878..eb3d09c04e 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
@@ -1,4 +1,7 @@
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include "smooth.sh"
 #include "tex_wedge.sh"
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
index 7764af51ec..c48bcf72af 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber.sc
@@ -20,7 +20,10 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
index b25bd18c26..20555df9b4 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_uber_pbr.sc
@@ -20,7 +20,10 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
index 787a8e8241..d6718320c8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface_uber_in.sh
@@ -20,7 +20,10 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$input v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
index c31ee4f3fc..27c245fcc2 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
@@ -6,10 +6,11 @@ vec2 a_texcoord0 : TEXCOORD0;
 vec2 a_texcoord1 : TEXCOORD1;
 
 vec3 v_position     : TEXCOORD2; // unused texcoord semantic
-vec3 v_worldPos     : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
 vec3 v_normal       : NORMAL;
 vec4 v_tangent      : TANGENT;
 vec4 v_color        : COLOR0;
 vec2 v_texcoord0    : TEXCOORD0;
 vec2 v_texcoord1    : TEXCOORD1;
+
+vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
+float v_discardFlag : TEXCOORD4; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
index 603c968ddf..8df3c3c88c 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
@@ -21,7 +21,10 @@
  ****************************************************************************/
 
 $input a_position, a_normal, a_tangent, a_color0, a_texcoord0, a_texcoord1
-$output v_position, v_worldPos, v_discardFlag, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+$output v_position, v_normal, v_tangent, v_color, v_texcoord0, v_texcoord1
+
+// cross section
+$output v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc
index b89bee2244..bb7f733bad 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/fs_surface_id.sc
@@ -20,6 +20,7 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
+// cross section
 $input v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/shaders_common.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc
index c5f39afd11..8c79002992 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/vs_surface_id.sc
@@ -21,6 +21,8 @@
  ****************************************************************************/
 
 $input a_position
+
+// cross section
 $output v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/shaders_common.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc
index 2100579769..2a88f7a990 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/fs_cpu_generated_lines.sc
@@ -20,7 +20,10 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_worldPos0, v_worldPos1, v_discardFlag, v_t, v_color, v_normal
+$input v_color, v_normal
+
+// cross section
+$input v_worldPos0, v_worldPos1, v_discardFlag, v_t
 
 #include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/directional_light_uniforms.sh>
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
index 1e671a7a68..96762d20bc 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
@@ -8,6 +8,7 @@ vec3 a_texcoord1 : TEXCOORD1; // n1
 vec4 v_color        : COLOR0;
 vec3 v_normal       : NORMAL;
 vec3 v_worldPos0    : TEXCOORD2; // unused texcoord semantic
-vec3 v_worldPos1    : TEXCOORD3; // unused texcoord semantic
+
+vec3  v_worldPos1   : TEXCOORD3; // unused texcoord semantic
 float v_discardFlag : TEXCOORD4; // unused texcoord semantic
 float v_t           : TEXCOORD5; // interpolation parameter along segment
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
index 18d59b5edc..3fa7f3108f 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
@@ -21,7 +21,10 @@
  ****************************************************************************/
 
 $input a_position, a_texcoord0, a_color0, a_color1, a_normal, a_texcoord1
-$output v_worldPos0, v_worldPos1, v_discardFlag, v_t, v_color, v_normal
+$output v_color, v_normal
+
+// cross section
+$output v_worldPos0, v_worldPos1, v_discardFlag, v_t
 
 #include <bgfx_shader.sh>
 #include <bgfx_compute.sh>

From 1f13489c147fcf72a3c9fe77785930ea8162603e Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Mon, 13 Apr 2026 15:26:55 +0200
Subject: [PATCH 22/49] [render] varying.def indent fixes

---
 .../drawable_mesh/points_instance/varying.def.sc     |  6 +++---
 .../drawable/drawable_mesh/surface/varying.def.sc    | 12 ++++++------
 .../lines/cpu_generated_lines/varying.def.sc         |  6 +++---
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
index ee363e7dc6..82f6451ece 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
@@ -2,9 +2,9 @@ vec3 a_position  : POSITION;
 vec4 a_color0    : COLOR0;
 vec3 a_normal    : NORMAL;
 
-vec3 v_normal       : NORMAL;
-vec4 v_color        : COLOR0;
-vec2 v_texcoord1    : TEXCOORD1;
+vec3 v_normal    : NORMAL;
+vec4 v_color     : COLOR0;
+vec2 v_texcoord1 : TEXCOORD1;
 
 vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
 float v_discardFlag : TEXCOORD4; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
index 27c245fcc2..cfe20c1ad3 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
@@ -5,12 +5,12 @@ vec4 a_color0    : COLOR0;
 vec2 a_texcoord0 : TEXCOORD0;
 vec2 a_texcoord1 : TEXCOORD1;
 
-vec3 v_position     : TEXCOORD2; // unused texcoord semantic
-vec3 v_normal       : NORMAL;
-vec4 v_tangent      : TANGENT;
-vec4 v_color        : COLOR0;
-vec2 v_texcoord0    : TEXCOORD0;
-vec2 v_texcoord1    : TEXCOORD1;
+vec3 v_position  : TEXCOORD2; // unused texcoord semantic
+vec3 v_normal    : NORMAL;
+vec4 v_tangent   : TANGENT;
+vec4 v_color     : COLOR0;
+vec2 v_texcoord0 : TEXCOORD0;
+vec2 v_texcoord1 : TEXCOORD1;
 
 vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
 float v_discardFlag : TEXCOORD4; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
index 96762d20bc..44b27c1499 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
@@ -5,10 +5,10 @@ vec4 a_color1    : COLOR1;    // c1
 vec3 a_normal    : NORMAL;    // n0
 vec3 a_texcoord1 : TEXCOORD1; // n1
 
-vec4 v_color        : COLOR0;
-vec3 v_normal       : NORMAL;
-vec3 v_worldPos0    : TEXCOORD2; // unused texcoord semantic
+vec4 v_color  : COLOR0;
+vec3 v_normal : NORMAL;
 
+vec3 v_worldPos0    : TEXCOORD2; // unused texcoord semantic
 vec3  v_worldPos1   : TEXCOORD3; // unused texcoord semantic
 float v_discardFlag : TEXCOORD4; // unused texcoord semantic
 float v_t           : TEXCOORD5; // interpolation parameter along segment

From 74d8efe96a1936917ded441a44204c52d40686bf Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 15 Apr 2026 15:30:54 +0200
Subject: [PATCH 23/49] [render] cross section on primitve points shader

---
 .../bgfx/drawable/drawable_mesh/points/fs_points.sc  |  6 ++++++
 .../drawable/drawable_mesh/points/varying.def.sc     |  3 +++
 .../bgfx/drawable/drawable_mesh/points/vs_points.sc  |  8 ++++++++
 .../drawable/drawable_mesh/points_id/fs_points_id.sc |  6 ++++++
 .../drawable/drawable_mesh/points_id/varying.def.sc  |  3 +++
 .../drawable/drawable_mesh/points_id/vs_points_id.sc | 10 ++++++++++
 .../points_instance/fs_points_instance.sc            |  4 ++--
 .../drawable_mesh/points_instance/varying.def.sc     |  6 +++---
 .../points_instance/vs_points_instance.sc            |  4 ++--
 .../points_instance_id/fs_points_instance_id.sc      | 10 ++++++++--
 .../drawable_mesh/points_instance_id/varying.def.sc  |  5 ++++-
 .../points_instance_id/vs_points_instance_id.sc      | 12 ++++++++++--
 .../drawable/drawable_mesh/surface_id/varying.def.sc |  4 ++--
 .../lines/cpu_generated_lines/varying.def.sc         |  2 +-
 14 files changed, 68 insertions(+), 15 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/fs_points.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/fs_points.sc
index cc13691c32..7c76a514c3 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/fs_points.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/fs_points.sc
@@ -23,10 +23,16 @@
 // TODO: remove v_position
 $input v_position, v_normal, v_color
 
+// cross section
+$input v_worldPos, v_discardFlag
+
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     // color
     vec4 color = vec4(0.0, 0.0, 0.0, 1.0);
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc
index eeb932d98a..55298cd165 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc
@@ -5,3 +5,6 @@ vec4 a_color0    : COLOR0;
 vec3 v_position  : TANGENT;
 vec3 v_normal    : NORMAL;
 vec4 v_color     : COLOR0;
+
+vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
+float v_discardFlag : TEXCOORD1; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/vs_points.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/vs_points.sc
index c23f8d10bf..547c2c875f 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/vs_points.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/vs_points.sc
@@ -23,14 +23,22 @@
 $input a_position, a_normal, a_color0
 $output v_position, v_normal, v_color
 
+// cross section
+$output v_worldPos, v_discardFlag
+
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
     gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
     v_position = mul(u_modelView, vec4(a_position, 1.0)).xyz;
     v_normal = normalize(mul(u_normalMatrix, a_normal));
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
 
     // default case - color is taken from buffer
     v_color = a_color0;
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/fs_points_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/fs_points_id.sc
index e5f18faa30..c9c568f664 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/fs_points_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/fs_points_id.sc
@@ -20,12 +20,18 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
+// cross section
+$input v_worldPos, v_discardFlag
+
 #include <vclib/bgfx/shaders_common.sh>
 
 #include <vclib/bgfx/drawable/uniforms/drawable_mesh_uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     /***** render ID to color ******/
     vec4 color = uintABGRToVec4Color(u_meshId);
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc
index 76522d5fc7..ca20ef2a35 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc
@@ -1 +1,4 @@
 vec3 a_position  : POSITION;
+
+vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
+float v_discardFlag : TEXCOORD1; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/vs_points_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/vs_points_id.sc
index 7c3bf73d47..4223956c56 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/vs_points_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/vs_points_id.sc
@@ -22,9 +22,19 @@
 
 $input a_position
 
+// cross section
+$output v_worldPos, v_discardFlag
+
 #include <vclib/bgfx/shaders_common.sh>
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
+
 void main()
 {
     gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
+
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
index 606946edae..6d4a965439 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
@@ -20,7 +20,7 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_normal, v_color, v_texcoord1
+$input v_normal, v_color, v_texcoord0
 
 // cross section
 $input v_worldPos, v_discardFlag
@@ -40,7 +40,7 @@ void main()
     bool isCircle = bool(u_pointsMode & posToBitFlag(VCL_MRS_POINTS_CIRCLE));
     bool isSphere = bool(u_pointsMode & posToBitFlag(VCL_MRS_POINTS_SPHERE));
     if (isCircle || isSphere) {
-        vec2 uv = v_texcoord1 * 2.0 - vec2(1.0, 1.0);
+        vec2 uv = v_texcoord0 * 2.0 - vec2(1.0, 1.0);
         if (length(uv) > 1.0) {
             discard;
         }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
index 82f6451ece..e768545285 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
@@ -4,7 +4,7 @@ vec3 a_normal    : NORMAL;
 
 vec3 v_normal    : NORMAL;
 vec4 v_color     : COLOR0;
-vec2 v_texcoord1 : TEXCOORD1;
+vec2 v_texcoord0 : TEXCOORD0;
 
-vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD1; // unused texcoord semantic
+float v_discardFlag : TEXCOORD2; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
index 1222a3fb64..28e09939f1 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
@@ -21,7 +21,7 @@
  ****************************************************************************/
 
 $input a_position, a_color0, a_normal, a_texcoord0
-$output v_normal, v_color, v_texcoord1
+$output v_normal, v_color, v_texcoord0
 
 // cross section
 $output v_worldPos, v_discardFlag
@@ -50,7 +50,7 @@ void main()
     v_color = a_color0;
 
     // quad parametrization
-    v_texcoord1 = quadUv;
+    v_texcoord0 = quadUv;
 
     // discard flag - used to discard the whole vertex, but in fragment shader
     v_discardFlag = computeDiscardFlag(v_worldPos);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/fs_points_instance_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/fs_points_instance_id.sc
index 69f803804a..c7468ffc6c 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/fs_points_instance_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/fs_points_instance_id.sc
@@ -20,15 +20,21 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_texcoord1
+$input v_texcoord0
+
+// cross section
+$input v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     // circle mode (if outside of the circle, discard)
     if (bool(u_pointsMode & posToBitFlag(VCL_MRS_POINTS_CIRCLE))) {
-        if (length(2.0 * v_texcoord1 - vec2(1.0, 1.0)) > 1.0) {
+        if (length(2.0 * v_texcoord0 - vec2(1.0, 1.0)) > 1.0) {
             discard;
         }
     }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc
index f2d31c1f10..93b6434c18 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc
@@ -1,3 +1,6 @@
 vec3 a_position  : POSITION;
 
-vec2 v_texcoord1 : TEXCOORD1;
+vec2 v_texcoord0 : TEXCOORD0;
+
+vec3  v_worldPos    : TEXCOORD1; // unused texcoord semantic
+float v_discardFlag : TEXCOORD2; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc
index 07e656561d..c1b75ad86c 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc
@@ -21,9 +21,13 @@
  ****************************************************************************/
 
 $input a_position
-$output v_texcoord1
+$output v_texcoord0
+
+// cross section
+$output v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 void main()
 {
@@ -37,9 +41,13 @@ void main()
         (2.0 * quadUv.y - 1.0) * u_pointWidth * u_viewTexel.y, // is divided by 2
         0, 0);
 
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     pos = pos / pos.w;
     gl_Position = pos + offset;
 
     // quad parametrization
-    v_texcoord1 = quadUv;
+    v_texcoord0 = quadUv;
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
index cbaadbb6fc..ca20ef2a35 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
@@ -1,4 +1,4 @@
 vec3 a_position  : POSITION;
 
-vec3 v_worldPos     : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
+float v_discardFlag : TEXCOORD1; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
index 44b27c1499..6ef87da284 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
@@ -8,7 +8,7 @@ vec3 a_texcoord1 : TEXCOORD1; // n1
 vec4 v_color  : COLOR0;
 vec3 v_normal : NORMAL;
 
-vec3 v_worldPos0    : TEXCOORD2; // unused texcoord semantic
+vec3  v_worldPos0   : TEXCOORD2; // unused texcoord semantic
 vec3  v_worldPos1   : TEXCOORD3; // unused texcoord semantic
 float v_discardFlag : TEXCOORD4; // unused texcoord semantic
 float v_t           : TEXCOORD5; // interpolation parameter along segment

From 8203e19d8c16bb58da11c717532e3933d4bdb64a Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 15 Apr 2026 16:09:46 +0200
Subject: [PATCH 24/49] [render] cross section on primitive lines

---
 .../lines/primitive_lines/fs_primitive_lines.sc           | 6 ++++++
 .../bgfx/primitives/lines/primitive_lines/varying.def.sc  | 3 +++
 .../lines/primitive_lines/vs_primitive_lines.sc           | 8 ++++++++
 3 files changed, 17 insertions(+)

diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/fs_primitive_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/fs_primitive_lines.sc
index af7d51edcf..3591b60d60 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/fs_primitive_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/fs_primitive_lines.sc
@@ -22,6 +22,10 @@
 
 $input v_color, v_normal
 
+// cross section
+$input v_worldPos, v_discardFlag
+
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/directional_light_uniforms.sh>
 #include <vclib/bgfx/primitives/lines/uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh> 
@@ -35,6 +39,8 @@ BUFFER_RO(edgesColors, uint, 0);
 #define vertexColor  v_color
 
 void main() {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     vec4 color;
     if (colorToUse == 0)        color = vertexColor;
     else if (colorToUse == 1)   color = edgeColor;
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc
index 06ab60c5c5..162152b0c5 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc
@@ -4,3 +4,6 @@ vec4 a_color0    : COLOR0;    // c0
 
 vec4 v_color     : COLOR0;    // vertex color
 vec3 v_normal    : NORMAL;
+
+vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
+float v_discardFlag : TEXCOORD1; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/vs_primitive_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/vs_primitive_lines.sc
index cbc7d002e2..845e03f203 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/vs_primitive_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/vs_primitive_lines.sc
@@ -23,9 +23,13 @@
 $input a_position, a_normal, a_color0
 $output v_color, v_normal
 
+// cross section
+$output v_worldPos, v_discardFlag
+
 #include <bgfx_shader.sh>
 #include <bgfx_compute.sh>
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/primitives/lines/uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh> 
 
@@ -36,7 +40,11 @@ $output v_color, v_normal
 void main() {
     v_color = color;
     v_normal = normalize(mul(u_normalMatrix, normal));
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     vec4 pos = mul(u_modelViewProj, vec4(p, 1.0));
     pos.z += -u_depthOffset * pos.w;
     gl_Position = pos;
+
+    // discard flag - used to discard the whole vertex, but in fragment shader
+    v_discardFlag = computeDiscardFlag(v_worldPos);
 }

From 4b4d736fa2f3d5d7331375eb8ec0a1a1524089a7 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 15 Apr 2026 16:20:46 +0200
Subject: [PATCH 25/49] [render] small fixes

---
 vclib/render/include/vclib/bgfx/primitives/lines.h    | 11 ++++++++++-
 .../vclib/render/drawable/abstract_drawable_mesh.h    |  4 ----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/primitives/lines.h b/vclib/render/include/vclib/bgfx/primitives/lines.h
index 9b0d7a7cdb..0609dc21ad 100644
--- a/vclib/render/include/vclib/bgfx/primitives/lines.h
+++ b/vclib/render/include/vclib/bgfx/primitives/lines.h
@@ -390,11 +390,20 @@ class Lines
      */
     Color& generalColor() { return mGeneralColor; }
 
-    CrossSectionSettings crossSectionSettings() const
+    /**
+     * @brief Returns the current cross section settings.
+     * @return The current cross section settings.
+     */
+    const CrossSectionSettings& crossSectionSettings() const
     {
         return mCrossSectionSettings;
     }
 
+    /**
+     * @brief Returns a reference to the current cross section settings. This
+     * allows to modify the settings directly.
+     * @return A reference to the current cross section settings.
+     */
     CrossSectionSettings& crossSectionSettings()
     {
         return mCrossSectionSettings;
diff --git a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
index 006521b8af..bb7cbb4fb6 100644
--- a/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
+++ b/vclib/render/include/vclib/render/drawable/abstract_drawable_mesh.h
@@ -40,10 +40,6 @@ namespace vcl {
  */
 class AbstractDrawableMesh : public vcl::DrawableObject
 {
-public:
-    enum class CrossSectionType { NONE, PER_VERTEX, PER_FRAGMENT };
-
-private:
     inline static const Image EMPTY_IMAGE;
 
 protected:

From 6e5c88a607dc54467470a2fa4cf3a1072d370327 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 15 Apr 2026 16:28:54 +0200
Subject: [PATCH 26/49] [render] enable cross section for all remaining surface
 shaders

---
 .../shaders/vclib/bgfx/drawable/drawable_mesh/surface/flat.sh   | 1 +
 .../drawable_mesh/surface/fs_surface_flat_color_face.sc         | 2 ++
 .../drawable_mesh/surface/fs_surface_flat_color_mesh.sc         | 2 ++
 .../drawable_mesh/surface/fs_surface_flat_color_user.sc         | 2 ++
 .../drawable_mesh/surface/fs_surface_flat_color_vertex.sc       | 2 ++
 .../drawable_mesh/surface/fs_surface_flat_tex_vertex.sc         | 2 ++
 .../drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc | 2 ++
 .../drawable_mesh/surface/fs_surface_none_color_face.sc         | 2 ++
 .../drawable_mesh/surface/fs_surface_none_color_mesh.sc         | 2 ++
 .../drawable_mesh/surface/fs_surface_none_color_user.sc         | 2 ++
 .../drawable_mesh/surface/fs_surface_none_color_vertex.sc       | 2 ++
 .../drawable_mesh/surface/fs_surface_none_tex_vertex.sc         | 2 ++
 .../drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc | 2 ++
 .../drawable_mesh/surface/fs_surface_smooth_color_face.sc       | 2 ++
 .../drawable_mesh/surface/fs_surface_smooth_color_mesh.sc       | 2 ++
 .../drawable_mesh/surface/fs_surface_smooth_color_user.sc       | 2 ++
 .../drawable_mesh/surface/fs_surface_smooth_color_vertex.sc     | 2 ++
 .../drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc       | 2 ++
 .../drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc        | 2 ++
 .../shaders/vclib/bgfx/drawable/drawable_mesh/surface/none.sh   | 1 +
 .../shaders/vclib/bgfx/drawable/drawable_mesh/surface/smooth.sh | 1 +
 21 files changed, 39 insertions(+)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/flat.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/flat.sh
index ae567e3f1c..19f68eb489 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/flat.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/flat.sh
@@ -1,5 +1,6 @@
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
 #include <vclib/bgfx/drawable/mesh/mesh_render_buffers_macros.h>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 BUFFER_RO(primitiveNormals, float, VCL_MRB_PRIMITIVE_NORMAL_BUFFER);
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
index d46c8a2af4..cbd7bfa4ac 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_face.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
index c2da6fc330..31ab7568c6 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_mesh.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
index efe2774f3d..0c67178c82 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_user.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
index 55935ba1f9..9aa8fb331d 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_color_vertex.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
index 7ff513c9b0..88a7558b71 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_vertex.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
index 11c3ff4dfc..c7f57f11c4 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_flat_tex_wedge.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
index 13d3dbe4cd..1f16dc5eff 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_face.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
index c8fd419b50..2e5e3a0fab 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_mesh.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
index 3bdc461d4d..189eef640b 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_user.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
index ceda415289..9fcd06a5c6 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_color_vertex.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
index 8f20ac1903..8e857906e8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_vertex.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
index 2757ef4b3f..77c339e7c7 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_none_tex_wedge.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
index db9605af55..6607fd7f67 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_face.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
index dcacfc7b15..5a96f28166 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_mesh.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
index 7aeb11d1c1..7aa0045fd8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_user.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
index 40e456f3c8..038f6821a0 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_color_vertex.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
index 2a5da58c93..d666f73aae 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_vertex.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
index eb3d09c04e..0d9a3abb5b 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_smooth_tex_wedge.sc
@@ -8,6 +8,8 @@ $input v_worldPos, v_discardFlag
 
 void main()
 {
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+
     SHADING
     COLORING
     gl_FragColor = light * color + vec4(specular, 0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/none.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/none.sh
index e510d9ba14..f942228f4f 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/none.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/none.sh
@@ -1,4 +1,5 @@
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 #define SHADING float depthOffset = 0.0;\
     vec3 specular = vec3(0.0, 0.0, 0.0);\
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/smooth.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/smooth.sh
index bc1e2cbd13..4fa6004743 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/smooth.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/smooth.sh
@@ -1,4 +1,5 @@
 #include <vclib/bgfx/drawable/drawable_mesh/uniforms.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 
 #define SHADING float depthOffset = 0.0;\
 vec3 normal = normalize(v_normal);\

From 5519c7427664446f8af812424002b984241c4493 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 09:11:52 +0200
Subject: [PATCH 27/49] [space] add isStrictlyBelow and isStrictlyAbove member
 functions to Point class

---
 vclib/core/include/vclib/space/core/point.h | 34 +++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/vclib/core/include/vclib/space/core/point.h b/vclib/core/include/vclib/space/core/point.h
index 50bb628179..a75d6c2b8a 100644
--- a/vclib/core/include/vclib/space/core/point.h
+++ b/vclib/core/include/vclib/space/core/point.h
@@ -412,6 +412,40 @@ class Point : public Eigen::Matrix<Scalar, N, 1>
             at(i) = args[i];
     }
 
+    /**
+     * @brief Returns true if this point is strictly below another point p1,
+     * meaning that all the components of this point are strictly less than the
+     * corresponding components of p1.
+     *
+     * @param[in] p1: The Point object to compare with.
+     * @return true if this point is strictly below p1, false otherwise.
+     */
+    bool isStrictlyBelow(const Point& p1) const
+    {
+        for (uint i = 0; i < N; i++) {
+            if (at(i) >= p1(i))
+                return false;
+        }
+        return true;
+    }
+
+    /**
+     * @brief Returns true if this point is strictly above another point p1,
+     * meaning that all the components of this point are strictly greater than
+     * the corresponding components of p1.
+     *
+     * @param[in] p1: The Point object to compare with.
+     * @return true if this point is strictly above p1, false otherwise.
+     */
+    bool isStrictlyAbove(const Point& p1) const
+    {
+        for (uint i = 0; i < N; i++) {
+            if (at(i) <= p1(i))
+                return false;
+        }
+        return true;
+    }
+
     /**
      * @brief Returns the outer product between this point p and p1, which is
      * p * p1^T

From e969dfb213452f7ad6fdb420d8d38b2d5cbc321e Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 09:12:59 +0200
Subject: [PATCH 28/49] [render] Add bounds checks and signal blocking to
 cross-section UI settings

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  |  3 +
 .../cross_section_settings_frame.h            |  6 +-
 .../render/settings/cross_section_settings.h  | 55 ++++++++++++++++---
 .../cross_section_settings_frame.cpp          | 53 ++++++++++++------
 4 files changed, 89 insertions(+), 28 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index a6484c815a..ce054b4933 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -138,7 +138,10 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         mMRB.update(*this, buffersToUpdate);
         mMRS.setRenderCapabilityFrom(*this);
         setRenderSettings(mMRS);
+
+        auto tmpType = mCSS.type();
         mCSS = CrossSectionSettings(*this);
+        mCSS.type() = tmpType;
     }
 
     void setRenderSettings(const MeshRenderSettings& rs) override
diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index 63538fecbd..8e020d7c98 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -29,6 +29,8 @@
 #include <QDoubleSpinBox>
 #include <QFrame>
 
+#include <array>
+
 namespace vcl::qt {
 
 namespace Ui {
@@ -51,8 +53,8 @@ class CrossSectionSettingsFrame : public QFrame
 
 public:
     explicit CrossSectionSettingsFrame(
-        const CrossSectionSettings css,
-        QWidget*                   parent = nullptr);
+        const CrossSectionSettings& css,
+        QWidget*                    parent = nullptr);
 
     explicit CrossSectionSettingsFrame(QWidget* parent = nullptr);
 
diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index 8e98590b6e..5322d75331 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -76,28 +76,67 @@ class CrossSectionSettings
 
     const Point3f& upper() const { return mUpper; }
 
+    /**
+     * @brief Sets the bounding box for the cross-section settings.
+     *
+     * The bounding box is updated to the provided value, and the lower and
+     * upper points are adjusted to be within the new bounding box if necessary.
+     *
+     * @param[in] bbox: The new bounding box to set.
+     */
     void setBoundingBox(const Box3f& bbox)
     {
         mBBox = bbox;
 
-        if (mLower < bbox.min()) {
-            mLower = bbox.min();
-        }
-        if (mUpper > bbox.max()) {
-            mUpper = bbox.max();
-        }
+        mLower = mLower.cwiseMax(bbox.min());
+        mUpper = mUpper.cwiseMin(bbox.max());
     }
 
+    /**
+     * @brief Sets the lower point of the cross-section settings.
+     *
+     * The lower point is updated only if it is inside the bounding box and
+     * strictly below the upper point.
+     *
+     * @param[in] lower: The new lower point to set.
+     */
     void setLower(const Point3f& lower)
     {
-        if (mBBox.isInside(lower)) {
+        if (mBBox.isInside(lower) && lower.isStrictlyBelow(mUpper)) {
             mLower = lower;
         }
     }
 
+    /**
+     * @brief Sets the upper point of the cross-section settings.
+     *
+     * The upper point is updated only if it is inside the bounding box and
+     * strictly above the lower point.
+     *
+     * @param[in] upper: The new upper point to set.
+     */
     void setUpper(const Point3f& upper)
     {
-        if (mBBox.isInside(upper)) {
+        if (mBBox.isInside(upper) && upper.isStrictlyAbove(mLower)) {
+            mUpper = upper;
+        }
+    }
+
+    /**
+     * @brief Sets both the lower and upper points of the cross-section
+     * settings.
+     *
+     * Both points are updated only if they are inside the bounding box and
+     * the lower point is strictly below the upper point.
+     *
+     * @param[in] lower: The new lower point to set.
+     * @param[in] upper: The new upper point to set.
+     */
+    void setLowerUpper(const Point3f& lower, const Point3f& upper)
+    {
+        if (mBBox.isInside(lower) && mBBox.isInside(upper) &&
+            lower.isStrictlyBelow(upper)) {
+            mLower = lower;
             mUpper = upper;
         }
     }
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 6ba9fd029a..3788ff3eb1 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -27,8 +27,8 @@
 namespace vcl::qt {
 
 CrossSectionSettingsFrame::CrossSectionSettingsFrame(
-    const CrossSectionSettings css,
-    QWidget*                   parent) :
+    const CrossSectionSettings& css,
+    QWidget*                    parent) :
         QFrame(parent), mUI(new Ui::CrossSectionSettingsFrame), mCSS(css)
 {
     mUI->setupUi(this);
@@ -125,15 +125,33 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
 {
     using enum CrossSectionSettings::CrossSectionType;
 
+    // checkbox
+    mUI->crosSectionEnabledCheckBox->blockSignals(true);
+
+    if (mCSS.type() == NONE)
+        mUI->crosSectionEnabledCheckBox->setCheckState(
+            Qt::CheckState::Unchecked);
+    else
+        mUI->crosSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
+
+    mUI->crosSectionEnabledCheckBox->blockSignals(false);
+
     // radio buttons
+    mUI->perVertexRadioButton->blockSignals(true);
+    mUI->perFragmentRadioButton->blockSignals(true);
+
     if (mCSS.type() == PER_VERTEX)
         mUI->perVertexRadioButton->setChecked(true);
     else if (mCSS.type() == PER_FRAGMENT)
         mUI->perFragmentRadioButton->setChecked(true);
 
-    auto bb = mCSS.boundingBox();
-    auto l = mCSS.lower();
-    auto u = mCSS.upper();
+    mUI->perVertexRadioButton->blockSignals(false);
+    mUI->perFragmentRadioButton->blockSignals(false);
+
+    // sliders and spinboxes
+    const auto& bb = mCSS.boundingBox();
+    const auto& l  = mCSS.lower();
+    const auto& u  = mCSS.upper();
 
     for (uint i = X; i < AXIS_COUNT; ++i) {
         updateSlider(
@@ -145,13 +163,6 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
             l[i],
             u[i]);
     }
-
-    // checkbox, last thing to do
-    if (mCSS.type() == NONE)
-        mUI->crosSectionEnabledCheckBox->setCheckState(
-            Qt::CheckState::Unchecked);
-    else
-        mUI->crosSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
 }
 
 void CrossSectionSettingsFrame::updateSlider(
@@ -226,9 +237,10 @@ void CrossSectionSettingsFrame::onPerFragmentToggled(bool checked)
 }
 
 void CrossSectionSettingsFrame::onFloatRangeSliderLowerValueChanged(
-    Axis axis, float value)
+    Axis  axis,
+    float value)
 {
-    auto l = mCSS.lower();
+    auto l  = mCSS.lower();
     l[axis] = value;
     mCSS.setLower(l);
 
@@ -241,9 +253,10 @@ void CrossSectionSettingsFrame::onFloatRangeSliderLowerValueChanged(
 }
 
 void CrossSectionSettingsFrame::onFloatRangeSliderUpperValueChanged(
-    Axis axis, float value)
+    Axis  axis,
+    float value)
 {
-    auto u = mCSS.upper();
+    auto u  = mCSS.upper();
     u[axis] = value;
     mCSS.setUpper(u);
 
@@ -255,12 +268,16 @@ void CrossSectionSettingsFrame::onFloatRangeSliderUpperValueChanged(
     emit crossSectionSettingsUpdated();
 }
 
-void CrossSectionSettingsFrame::onMinSpinBoxValueChanged(Axis axis, double value)
+void CrossSectionSettingsFrame::onMinSpinBoxValueChanged(
+    Axis   axis,
+    double value)
 {
     mFloatSliders[axis]->setLowerValue(static_cast<float>(value));
 }
 
-void CrossSectionSettingsFrame::onMaxSpinBoxValueChanged(Axis axis, double value)
+void CrossSectionSettingsFrame::onMaxSpinBoxValueChanged(
+    Axis   axis,
+    double value)
 {
     mFloatSliders[axis]->setUpperValue(static_cast<float>(value));
 }

From 5d7b8b5a72f348398ab5e09d0b2ba37b339d1863 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 12:30:57 +0200
Subject: [PATCH 29/49] [render] Improve cross section settings handling and UI
 state synchronization

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  |  1 +
 .../render/settings/cross_section_settings.h  | 21 +++++++++++++---
 .../cross_section_settings_frame.cpp          |  8 +++++--
 vclib/render/src/vclib/qt/mesh_viewer.cpp     | 24 +++++++++++--------
 4 files changed, 39 insertions(+), 15 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index ce054b4933..b067cbaa41 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -142,6 +142,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         auto tmpType = mCSS.type();
         mCSS = CrossSectionSettings(*this);
         mCSS.type() = tmpType;
+        mMRB.updateCrossSectionSettings(mCSS);
     }
 
     void setRenderSettings(const MeshRenderSettings& rs) override
diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index 5322d75331..1af6f0ab1e 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -86,10 +86,25 @@ class CrossSectionSettings
      */
     void setBoundingBox(const Box3f& bbox)
     {
-        mBBox = bbox;
+        if (!bbox.isNull()) {
+            mBBox = bbox;
 
-        mLower = mLower.cwiseMax(bbox.min());
-        mUpper = mUpper.cwiseMin(bbox.max());
+            Point3f clampedLower =
+                mLower.cwiseMax(bbox.min()).cwiseMin(bbox.max());
+            Point3f clampedUpper =
+                mUpper.cwiseMax(bbox.min()).cwiseMin(bbox.max());
+
+            mLower = clampedLower.cwiseMin(clampedUpper);
+            mUpper = clampedLower.cwiseMax(clampedUpper);
+
+            if (!mLower.isStrictlyBelow(mUpper)) {
+                mLower = bbox.min();
+                mUpper = bbox.max();
+            }
+        }
+        else {
+            mBBox = Box3f(Point3f::min(), Point3f::max());
+        }
     }
 
     /**
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 3788ff3eb1..82bc748b63 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -128,11 +128,15 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
     // checkbox
     mUI->crosSectionEnabledCheckBox->blockSignals(true);
 
-    if (mCSS.type() == NONE)
+    if (mCSS.type() == NONE) {
         mUI->crosSectionEnabledCheckBox->setCheckState(
             Qt::CheckState::Unchecked);
-    else
+        mUI->controlsFrame->setEnabled(false);
+    }
+    else {
         mUI->crosSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
+        mUI->controlsFrame->setEnabled(true);
+    }
 
     mUI->crosSectionEnabledCheckBox->blockSignals(false);
 
diff --git a/vclib/render/src/vclib/qt/mesh_viewer.cpp b/vclib/render/src/vclib/qt/mesh_viewer.cpp
index 51a97f0fbe..6ab67fcbb4 100644
--- a/vclib/render/src/vclib/qt/mesh_viewer.cpp
+++ b/vclib/render/src/vclib/qt/mesh_viewer.cpp
@@ -274,11 +274,13 @@ void MeshViewer::meshRenderSettingsUpdated()
         // visible only when the selected Object is a AbstractDrawableMesh
         auto m = std::dynamic_pointer_cast<AbstractDrawableMesh>(
             mDrawableObjectVector->at(i));
-        // get RenderSettings from the RenderSettingsFrame, and set it to the
-        // AbstractDrawableMesh
-        m->setRenderSettings(
-            mUI->meshRenderSettingsFrame->meshRenderSettings());
-        mUI->viewer->update();
+        if (m) { // just to be sure, but it should always be true
+            // get RenderSettings from the RenderSettingsFrame, and set it to
+            // the AbstractDrawableMesh
+            m->setRenderSettings(
+                mUI->meshRenderSettingsFrame->meshRenderSettings());
+            mUI->viewer->update();
+        }
     }
 }
 
@@ -292,11 +294,13 @@ void MeshViewer::crossSectionSettingsUpdated()
         // visible only when the selected Object is a AbstractDrawableMesh
         auto m = std::dynamic_pointer_cast<AbstractDrawableMesh>(
             mDrawableObjectVector->at(i));
-        // get CrossSectionSettings from the CrossSectionSettingsFrame, and set
-        // it to the AbstractDrawableMesh
-        m->setCrossSectionSettings(
-            mUI->meshRenderSettingsFrame->crossSectionSettings());
-        mUI->viewer->update();
+        if (m) { // just to be sure, but it should always be true
+            // get CrossSectionSettings from the CrossSectionSettingsFrame, and
+            // set it to the AbstractDrawableMesh
+            m->setCrossSectionSettings(
+                mUI->meshRenderSettingsFrame->crossSectionSettings());
+            mUI->viewer->update();
+        }
     }
 }
 

From 2a75ff48c57c359d07ecb6115ea2f93bed727f65 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 14:18:17 +0200
Subject: [PATCH 30/49] [space] isStrictly[Below/Above] member functions
 renamed to all[Less/Greater]Than, and add all[Less/Greater]EqualThan member
 functions to Point class

---
 vclib/core/include/vclib/space/core/point.h | 46 +++++++++++++++++----
 1 file changed, 38 insertions(+), 8 deletions(-)

diff --git a/vclib/core/include/vclib/space/core/point.h b/vclib/core/include/vclib/space/core/point.h
index a75d6c2b8a..1cb5b542c8 100644
--- a/vclib/core/include/vclib/space/core/point.h
+++ b/vclib/core/include/vclib/space/core/point.h
@@ -413,14 +413,13 @@ class Point : public Eigen::Matrix<Scalar, N, 1>
     }
 
     /**
-     * @brief Returns true if this point is strictly below another point p1,
-     * meaning that all the components of this point are strictly less than the
-     * corresponding components of p1.
+     * @brief Returns true if all the components of this point are strictly less
+     * than the corresponding components of another point p1.
      *
      * @param[in] p1: The Point object to compare with.
      * @return true if this point is strictly below p1, false otherwise.
      */
-    bool isStrictlyBelow(const Point& p1) const
+    bool allLessThan(const Point& p1) const
     {
         for (uint i = 0; i < N; i++) {
             if (at(i) >= p1(i))
@@ -430,14 +429,29 @@ class Point : public Eigen::Matrix<Scalar, N, 1>
     }
 
     /**
-     * @brief Returns true if this point is strictly above another point p1,
-     * meaning that all the components of this point are strictly greater than
-     * the corresponding components of p1.
+     * @brief Returns true if all the components of this point are less than or
+     * equal to the corresponding components of another point p1.
+     *
+     * @param[in] p1: The Point object to compare with.
+     * @return true if this point is below or equal to p1, false otherwise.
+     */
+    bool allLessEqualThan(const Point& p1) const
+    {
+        for (uint i = 0; i < N; i++) {
+            if (at(i) > p1(i))
+                return false;
+        }
+        return true;
+    }
+
+    /**
+     * @brief Returns true if all the components of this point are strictly
+     * greater than the corresponding components of another point p1.
      *
      * @param[in] p1: The Point object to compare with.
      * @return true if this point is strictly above p1, false otherwise.
      */
-    bool isStrictlyAbove(const Point& p1) const
+    bool allGreaterThan(const Point& p1) const
     {
         for (uint i = 0; i < N; i++) {
             if (at(i) <= p1(i))
@@ -446,6 +460,22 @@ class Point : public Eigen::Matrix<Scalar, N, 1>
         return true;
     }
 
+    /**
+     * @brief Returns true if all the components of this point are greater than
+     * or equal to the corresponding components of another point p1.
+     *
+     * @param[in] p1: The Point object to compare with.
+     * @return true if this point is above or equal to p1, false otherwise.
+     */
+    bool allGreaterEqualThan(const Point& p1) const
+    {
+        for (uint i = 0; i < N; i++) {
+            if (at(i) < p1(i))
+                return false;
+        }
+        return true;
+    }
+
     /**
      * @brief Returns the outer product between this point p and p1, which is
      * p * p1^T

From b6fb4d6614372526208640e6c0e5c90da8ac2efd Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 14:18:34 +0200
Subject: [PATCH 31/49] [render] Refactor CrossSectionSettings bbox logic and
 fix UI checkbox/spinbox names

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  |  4 +-
 .../render/settings/cross_section_settings.h  | 62 +++++++++++++------
 .../cross_section_settings_frame.cpp          | 10 +--
 .../cross_section_settings_frame.ui           | 26 ++++++--
 4 files changed, 70 insertions(+), 32 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index b067cbaa41..ac96a2d097 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -139,9 +139,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         mMRS.setRenderCapabilityFrom(*this);
         setRenderSettings(mMRS);
 
-        auto tmpType = mCSS.type();
-        mCSS = CrossSectionSettings(*this);
-        mCSS.type() = tmpType;
+        mCSS.setBoundingBox(*this);
         mMRB.updateCrossSectionSettings(mCSS);
     }
 
diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index 1af6f0ab1e..7271a861ac 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -46,22 +46,9 @@ class CrossSectionSettings
     CrossSectionSettings() = default;
 
     template<MeshConcept MeshType>
-    CrossSectionSettings(const MeshType& m)
+    CrossSectionSettings(const MeshType& m, float epsilon = 0.02f)
     {
-        mBBox = vcl::boundingBox(m).template cast<float>();
-        if constexpr (HasTransformMatrix<MeshType>) {
-            Matrix44f transform = m.transformMatrix().template cast<float>();
-            mBBox               = transformBox(mBBox, transform);
-        }
-
-        // inflate bbox by epsilon of its diagonal
-        float eps = mBBox.diagonal() * 0.02f;
-
-        mBBox.min() -= eps;
-        mBBox.max() += eps;
-
-        mLower = mBBox.min();
-        mUpper = mBBox.max();
+        setBoundingBox(m, epsilon);
     }
 
     bool isEnabled() const { return mType != CrossSectionType::NONE; }
@@ -97,7 +84,7 @@ class CrossSectionSettings
             mLower = clampedLower.cwiseMin(clampedUpper);
             mUpper = clampedLower.cwiseMax(clampedUpper);
 
-            if (!mLower.isStrictlyBelow(mUpper)) {
+            if (!mLower.allLessEqualThan(mUpper)) {
                 mLower = bbox.min();
                 mUpper = bbox.max();
             }
@@ -107,6 +94,43 @@ class CrossSectionSettings
         }
     }
 
+    /**
+     * @brief Sets the bounding box for the cross-section settings based on the
+     * given mesh.
+     *
+     * The bounding box is computed from the vertices of the provided mesh, and
+     * the lower and upper points are adjusted to be within the new bounding box
+     * if necessary. Bounding box is inflated by an epsilon of its diagonal to
+     * avoid numerical issues when the cross-section plane is very close to the
+     * bounding box.
+     *
+     * Model transformation is applied to the bounding box if the mesh has a
+     * transform matrix.
+     *
+     * @tparam MeshType: The type of the mesh for which to compute the bounding
+     * box. The mesh type must satisfy the MeshConcept.
+     *
+     * @param[in] m: The mesh from which to compute the bounding box.
+     * @param[in] epsilon: The epsilon value used to inflate the bounding box.
+     * It is expressed as a fraction of the bounding box diagonal.
+     */
+    template<MeshConcept MeshType>
+    void setBoundingBox(const MeshType& m, float epsilon = 0.02f)
+    {
+        auto bbox = vcl::boundingBox(m).template cast<float>();
+        if constexpr (HasTransformMatrix<MeshType>) {
+            Matrix44f transform = m.transformMatrix().template cast<float>();
+            bbox                = transformBox(bbox, transform);
+        }
+        // inflate bbox by epsilon of its diagonal
+        float eps = bbox.diagonal() * epsilon;
+
+        bbox.min() -= eps;
+        bbox.max() += eps;
+
+        setBoundingBox(bbox);
+    }
+
     /**
      * @brief Sets the lower point of the cross-section settings.
      *
@@ -117,7 +141,7 @@ class CrossSectionSettings
      */
     void setLower(const Point3f& lower)
     {
-        if (mBBox.isInside(lower) && lower.isStrictlyBelow(mUpper)) {
+        if (mBBox.isInside(lower) && lower.allLessEqualThan(mUpper)) {
             mLower = lower;
         }
     }
@@ -132,7 +156,7 @@ class CrossSectionSettings
      */
     void setUpper(const Point3f& upper)
     {
-        if (mBBox.isInside(upper) && upper.isStrictlyAbove(mLower)) {
+        if (mBBox.isInside(upper) && upper.allGreaterEqualThan(mLower)) {
             mUpper = upper;
         }
     }
@@ -150,7 +174,7 @@ class CrossSectionSettings
     void setLowerUpper(const Point3f& lower, const Point3f& upper)
     {
         if (mBBox.isInside(lower) && mBBox.isInside(upper) &&
-            lower.isStrictlyBelow(upper)) {
+            lower.allLessEqualThan(upper)) {
             mLower = lower;
             mUpper = upper;
         }
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 82bc748b63..a03ba3c254 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -48,7 +48,7 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
     updateFrameFromSettings();
 
     connect(
-        mUI->crosSectionEnabledCheckBox,
+        mUI->crossSectionEnabledCheckBox,
         SIGNAL(checkStateChanged(Qt::CheckState)),
         this,
         SLOT(onCrossSectionEnabledChanged(Qt::CheckState)));
@@ -126,19 +126,19 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
     using enum CrossSectionSettings::CrossSectionType;
 
     // checkbox
-    mUI->crosSectionEnabledCheckBox->blockSignals(true);
+    mUI->crossSectionEnabledCheckBox->blockSignals(true);
 
     if (mCSS.type() == NONE) {
-        mUI->crosSectionEnabledCheckBox->setCheckState(
+        mUI->crossSectionEnabledCheckBox->setCheckState(
             Qt::CheckState::Unchecked);
         mUI->controlsFrame->setEnabled(false);
     }
     else {
-        mUI->crosSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
+        mUI->crossSectionEnabledCheckBox->setCheckState(Qt::CheckState::Checked);
         mUI->controlsFrame->setEnabled(true);
     }
 
-    mUI->crosSectionEnabledCheckBox->blockSignals(false);
+    mUI->crossSectionEnabledCheckBox->blockSignals(false);
 
     // radio buttons
     mUI->perVertexRadioButton->blockSignals(true);
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index 8428ce13b0..5433f7b026 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -15,7 +15,7 @@
   </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
-    <widget class="QCheckBox" name="crosSectionEnabledCheckBox">
+    <widget class="QCheckBox" name="crossSectionEnabledCheckBox">
      <property name="text">
       <string>Enable Cross Section</string>
      </property>
@@ -96,7 +96,11 @@
           <widget class="vcl::qt::FloatRangeSlider" name="zFloatRangeSlider" native="true"/>
          </item>
          <item row="5" column="1">
-          <widget class="QDoubleSpinBox" name="yMinSpinBox"/>
+          <widget class="QDoubleSpinBox" name="yMinSpinBox">
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
+          </widget>
          </item>
          <item row="2" column="1">
           <widget class="QDoubleSpinBox" name="xMinSpinBox">
@@ -158,13 +162,25 @@
           </widget>
          </item>
          <item row="8" column="1">
-          <widget class="QDoubleSpinBox" name="zMinSpinBox"/>
+          <widget class="QDoubleSpinBox" name="zMinSpinBox">
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
+          </widget>
          </item>
          <item row="8" column="2">
-          <widget class="QDoubleSpinBox" name="zMaxSpinBox"/>
+          <widget class="QDoubleSpinBox" name="zMaxSpinBox">
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
+          </widget>
          </item>
          <item row="5" column="2">
-          <widget class="QDoubleSpinBox" name="yMaxSpinBox"/>
+          <widget class="QDoubleSpinBox" name="yMaxSpinBox">
+           <property name="singleStep">
+            <double>0.010000000000000</double>
+           </property>
+          </widget>
          </item>
          <item row="3" column="0" colspan="3">
           <widget class="Line" name="yLine">

From 5f14a1522aaca1be15905aac4f30b63a98f08895 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 14:49:32 +0200
Subject: [PATCH 32/49] [render] Add per-fragment flag to uniforms and handle
 null bounding boxes

---
 .../uniforms/cross_section_uniforms.h         |  9 ++++----
 .../render/settings/cross_section_settings.h  | 21 +++++++++++--------
 .../cross_section_settings_frame.cpp          |  2 --
 3 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
index c2b4217cec..0bf9b5a6e1 100644
--- a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
+++ b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
@@ -35,7 +35,8 @@ class CrossSectionUniforms
         Point3f::min().x(), // x min
         Point3f::min().y(), // y min
         Point3f::min().z(), // z min
-        0.0                 // unused
+        0.0                 // per-fragment flag
+                            // (0.0 = per-vertex, 1.0 = per-fragment)
     };
 
     inline static std::array<float, 4> sCrossSectionMaxData = {
@@ -52,9 +53,9 @@ class CrossSectionUniforms
     CrossSectionUniforms() = delete;
 
     static void set(
-        const Point3f& minPoint = Point3f::min(),
-        const Point3f& maxPoint = Point3f::max(),
-        bool perFragment = false)
+        const Point3f& minPoint    = Point3f::min(),
+        const Point3f& maxPoint    = Point3f::max(),
+        bool           perFragment = false)
     {
         sCrossSectionMinData[0] = minPoint.x();
         sCrossSectionMinData[1] = minPoint.y();
diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index 7271a861ac..6155f5e024 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -118,17 +118,20 @@ class CrossSectionSettings
     void setBoundingBox(const MeshType& m, float epsilon = 0.02f)
     {
         auto bbox = vcl::boundingBox(m).template cast<float>();
-        if constexpr (HasTransformMatrix<MeshType>) {
-            Matrix44f transform = m.transformMatrix().template cast<float>();
-            bbox                = transformBox(bbox, transform);
-        }
-        // inflate bbox by epsilon of its diagonal
-        float eps = bbox.diagonal() * epsilon;
 
-        bbox.min() -= eps;
-        bbox.max() += eps;
+        if (!bbox.isNull()) {
+            if constexpr (HasTransformMatrix<MeshType>) {
+                Matrix44f transform = m.transformMatrix().template cast<float>();
+                bbox                = transformBox(bbox, transform);
+            }
+            // inflate bbox by epsilon of its diagonal
+            float eps = bbox.diagonal() * epsilon;
 
-        setBoundingBox(bbox);
+            bbox.min() -= eps;
+            bbox.max() += eps;
+
+            setBoundingBox(bbox);
+        }
     }
 
     /**
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index a03ba3c254..1979ddf19c 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -45,8 +45,6 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
     mMaxSpinBoxes[Y] = mUI->yMaxSpinBox;
     mMaxSpinBoxes[Z] = mUI->zMaxSpinBox;
 
-    updateFrameFromSettings();
-
     connect(
         mUI->crossSectionEnabledCheckBox,
         SIGNAL(checkStateChanged(Qt::CheckState)),

From 3dae7d0854342763de789d296b2529b8347d8c28 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Apr 2026 16:28:32 +0200
Subject: [PATCH 33/49] [render] Initialize mCrossSectionFrame to nullptr and
 update frame on construction

---
 .../include/vclib/qt/gui/mesh_render_settings_frame.h       | 2 +-
 .../include/vclib/render/settings/cross_section_settings.h  | 6 +++---
 .../cross_section_settings_frame.cpp                        | 2 ++
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
index fd9df70e3e..71d22d3cfd 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame.h
@@ -47,7 +47,7 @@ class MeshRenderSettingsFrame : public QFrame
     MeshRenderSettings           mMRS;
 
     std::vector<GenericMeshRenderSettingsFrame*> mFrames;
-    CrossSectionSettingsFrame*                   mCrossSectionFrame;
+    CrossSectionSettingsFrame*                   mCrossSectionFrame = nullptr;
 
 public:
     explicit MeshRenderSettingsFrame(QWidget* parent = nullptr);
diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index 6155f5e024..55e8f5c5b8 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -138,7 +138,7 @@ class CrossSectionSettings
      * @brief Sets the lower point of the cross-section settings.
      *
      * The lower point is updated only if it is inside the bounding box and
-     * strictly below the upper point.
+     * strictly below or equal to the upper point.
      *
      * @param[in] lower: The new lower point to set.
      */
@@ -153,7 +153,7 @@ class CrossSectionSettings
      * @brief Sets the upper point of the cross-section settings.
      *
      * The upper point is updated only if it is inside the bounding box and
-     * strictly above the lower point.
+     * strictly above or equal to the lower point.
      *
      * @param[in] upper: The new upper point to set.
      */
@@ -169,7 +169,7 @@ class CrossSectionSettings
      * settings.
      *
      * Both points are updated only if they are inside the bounding box and
-     * the lower point is strictly below the upper point.
+     * the lower point is strictly below or equal to  the upper point.
      *
      * @param[in] lower: The new lower point to set.
      * @param[in] upper: The new upper point to set.
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 1979ddf19c..704bf37798 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -94,6 +94,8 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
                 onMaxSpinBoxValueChanged(static_cast<Axis>(i), value);
             });
     }
+
+    updateFrameFromSettings();
 }
 
 CrossSectionSettingsFrame::CrossSectionSettingsFrame(QWidget* parent) :

From 4b59cfe1dc0325c1e1f83e10c62474dc144f2218 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Sat, 18 Apr 2026 10:34:42 +0200
Subject: [PATCH 34/49] [render] cpu lines - Apply near-plane clipping to
 v_worldPos0 and v_worldPos1 variables

---
 .../cpu_generated_lines/vs_cpu_generated_lines.sc   | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
index 3fa7f3108f..e14753872c 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/vs_cpu_generated_lines.sc
@@ -52,8 +52,9 @@ void main() {
     int generalIndex = gl_VertexID % 4;
     vec2 uv = vec2((generalIndex >> 1) & 0x1, generalIndex & 0x1);
 
-    v_worldPos0 = mul(u_model[0], vec4(p0, 1.0)).xyz;
-    v_worldPos1 = mul(u_model[0], vec4(p1, 1.0)).xyz;
+    // compute initial world positions
+    vec3 worldP0 = mul(u_model[0], vec4(p0, 1.0)).xyz;
+    vec3 worldP1 = mul(u_model[0], vec4(p1, 1.0)).xyz;
 
     // segment points in clip space
     vec4 p0_NDC = mul(u_modelViewProj, vec4(p0, 1.0));
@@ -72,12 +73,16 @@ void main() {
     vec3 clippedNormal0 = n0_NDC;
     vec3 clippedNormal1 = n1_NDC;
 
+    vec3 clippedWorldP0 = worldP0;
+    vec3 clippedWorldP1 = worldP1;
+
     if (p0_NDC.w < NEAR_EPSILON) {
         float t = (NEAR_EPSILON - p0_NDC.w) / (p1_NDC.w - p0_NDC.w);
 
         clippedP0 = mix(p0_NDC, p1_NDC, t);
         clippedColor0 = mix(color0, color1, t);
         clippedNormal0 = mix(normal0, normal1, t);
+        clippedWorldP0 = mix(worldP0, worldP1, t);
     }
 
     if (p1_NDC.w < NEAR_EPSILON) {
@@ -86,6 +91,7 @@ void main() {
         clippedP1 = mix(p1_NDC, p0_NDC, t);
         clippedColor1 = mix(color1, color0, t);
         clippedNormal1 = mix(normal1, normal0, t);
+        clippedWorldP1 = mix(worldP1, worldP0, t);
     }
 
     // pick this vertex's position by uv.x along clipped segment */
@@ -113,6 +119,9 @@ void main() {
         p.xy = p.xy + (offsetNDC * p.w);
     }
 
+    v_worldPos0 = clippedWorldP0;
+    v_worldPos1 = clippedWorldP1;
+    
     v_color = color;
     v_normal = normal;
     v_t = uv.x;

From 943c1bc602b94d953749aa4f629e36d9c495aa3a Mon Sep 17 00:00:00 2001
From: Alessandro Muntoni <alemuntoni@users.noreply.github.com>
Date: Sun, 7 Jun 2026 09:35:10 +0200
Subject: [PATCH 35/49] [render] fix dx build error

---
 .../drawable_mesh/points_instance/fs_points_instance.sc       | 2 +-
 .../drawable/drawable_mesh/points_instance/varying.def.sc     | 1 -
 .../drawable_mesh/points_instance/vs_points_instance.sc       | 4 ++--
 3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
index 87e0bdcc5e..6c78e433d8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/fs_points_instance.sc
@@ -20,7 +20,7 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input v_normal, v_color, v_texcoord0
+$input v_normal, v_texcoord0
 
 // cross section
 $input v_worldPos, v_discardFlag
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
index 09e62dce69..8e7052a465 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
@@ -2,7 +2,6 @@ vec3 a_position  : POSITION;
 vec3 a_normal    : NORMAL;
 
 vec3 v_normal    : NORMAL;
-vec4 v_color     : COLOR0;
 vec2 v_texcoord0 : TEXCOORD0;
 
 vec3  v_worldPos    : TEXCOORD1; // unused texcoord semantic
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
index 2f6975042a..d337d8e588 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
@@ -20,8 +20,8 @@
  * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
  ****************************************************************************/
 
-$input a_position, a_color0, a_normal, a_texcoord0
-$output v_normal, v_color, v_texcoord0
+$input a_position, a_normal
+$output v_normal, v_texcoord0
 
 // cross section
 $output v_worldPos, v_discardFlag

From f03ff10ccfb8a5583139c70c92f8cdd423300aff Mon Sep 17 00:00:00 2001
From: Alessandro Muntoni <alemuntoni@users.noreply.github.com>
Date: Sun, 7 Jun 2026 10:05:54 +0200
Subject: [PATCH 36/49] [render] fix CrossSectionSettings lower and upper reset
 when bbox set

---
 .../include/vclib/render/settings/cross_section_settings.h     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index 55e8f5c5b8..bb1567d74c 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -74,6 +74,9 @@ class CrossSectionSettings
     void setBoundingBox(const Box3f& bbox)
     {
         if (!bbox.isNull()) {
+            mLower = Point3f::min();
+            mUpper = Point3f::max();
+
             mBBox = bbox;
 
             Point3f clampedLower =

From a8bd1d9a936f4ad3102066392bd7d34f109075d1 Mon Sep 17 00:00:00 2001
From: Alessandro Muntoni <alemuntoni@users.noreply.github.com>
Date: Mon, 29 Jun 2026 10:04:38 +0200
Subject: [PATCH 37/49] [render] fix msvc build error

---
 .../drawable/drawable_mesh/points_instance/vs_points_instance.sc | 1 +
 .../drawable_mesh/points_instance_id/vs_points_instance_id.sc    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
index 1ba730f2d8..0c3d6212ba 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/vs_points_instance.sc
@@ -28,6 +28,7 @@ void main()
 
     gl_Position = pos + offset;
     v_normal = normalize(mul(u_normalMatrix, a_normal));
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
 
     // quad parametrization
     v_texcoord0 = quadUv;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc
index 02fb110513..4ec640ff4a 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/vs_points_instance_id.sc
@@ -27,6 +27,7 @@ void main()
         0, 0);
 
     gl_Position = pos + offset;
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
 
     // quad parametrization
     v_texcoord0 = quadUv;

From 40aaf4576004930b03ca184f0eddca4ee4a51a97 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 1 Jul 2026 08:40:24 +0200
Subject: [PATCH 38/49] [render] fix not renamed settings updated signal

---
 .../vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp
index b3ce56d8ac..12b4e8c334 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/surface_frame.cpp
@@ -196,7 +196,7 @@ void SurfaceFrame::onShadingNormalMapToggled(bool checked)
 {
     if (checked) {
         mMRS.setSurface(SHADING_NORMAL_MAP);
-        emit settingsUpdated();
+        emit meshRenderSettingsUpdated();
     }
 }
 

From f53ae04bd044125df94c0b95804eba1e505566d0 Mon Sep 17 00:00:00 2001
From: Alessandro Muntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 1 Jul 2026 16:15:07 +0200
Subject: [PATCH 39/49] [render] Add section-enabled surface shading options
 and update shader configs

---
 .../vclib/bgfx/drawable/drawable_mesh_bgfx.h  | 110 ++++++++++++------
 .../drawable_mesh/surface/fs_surface_in.sh    |   2 +
 .../drawable_mesh/surface/surface.config      |   9 +-
 .../{vs_surface.sc => vs_surface_in.sh}       |   6 +-
 4 files changed, 88 insertions(+), 39 deletions(-)
 rename vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/{vs_surface.sc => vs_surface_in.sh} (95%)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index c297cd74a9..0545fdc946 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -460,63 +460,101 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
 
         ProgramManager& pm = Context::instance().programManager();
 
-        static const std::array<bgfx::ProgramHandle, 24> surfaceProgramHandles =
-            {pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NONE_COLOR_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NONE_COLOR_MESH>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NONE_COLOR_FACE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NONE_COLOR_USER>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NONE_COLOR_TEX_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NONE_COLOR_TEX_WEDGE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_FLAT_COLOR_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_FLAT_COLOR_MESH>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_FLAT_COLOR_FACE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_FLAT_COLOR_USER>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_FLAT_COLOR_TEX_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_FLAT_COLOR_TEX_WEDGE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_SMOOTH_COLOR_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_SMOOTH_COLOR_MESH>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_SMOOTH_COLOR_FACE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_SMOOTH_COLOR_USER>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_SMOOTH_COLOR_TEX_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_SMOOTH_COLOR_TEX_WEDGE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NORMAL_MAP_COLOR_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NORMAL_MAP_COLOR_MESH>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NORMAL_MAP_COLOR_FACE>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NORMAL_MAP_COLOR_USER>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NORMAL_MAP_COLOR_TEX_VERTEX>(),
-             pm.getProgram<DRAWABLE_MESH_SURFACE_SHADING_NORMAL_MAP_COLOR_TEX_WEDGE>()};
-        uint mul = 0;
-        uint off = 0;
+        static const std::array<bgfx::ProgramHandle, 48> surfaceProgramHandles =
+            {pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NONE_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NONE_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NONE_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NONE_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NONE_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NONE_COLOR_TEX_WEDGE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_FLAT_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_FLAT_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_FLAT_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_FLAT_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_FLAT_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_FLAT_COLOR_TEX_WEDGE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_SMOOTH_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_SMOOTH_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_SMOOTH_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_SMOOTH_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_SMOOTH_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_SMOOTH_COLOR_TEX_WEDGE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NORMAL_MAP_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NORMAL_MAP_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NORMAL_MAP_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NORMAL_MAP_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NORMAL_MAP_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_DISABLED_SHADING_NORMAL_MAP_COLOR_TEX_WEDGE>(),
+
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NONE_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NONE_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NONE_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NONE_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NONE_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NONE_COLOR_TEX_WEDGE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_TEX_WEDGE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_SMOOTH_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_SMOOTH_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_SMOOTH_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_SMOOTH_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_SMOOTH_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_SMOOTH_COLOR_TEX_WEDGE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NORMAL_MAP_COLOR_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NORMAL_MAP_COLOR_MESH>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NORMAL_MAP_COLOR_FACE>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NORMAL_MAP_COLOR_USER>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NORMAL_MAP_COLOR_TEX_VERTEX>(),
+             pm.getProgram<DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_NORMAL_MAP_COLOR_TEX_WEDGE>()};
+
+
+        uint section = 0;
+        uint shading = 0;
+        uint color = 0;
+
+        const uint N_SECTION_TYPES = 2;
+        const uint N_SHADING_TYPES = 4;
+        const uint N_COLOR_TYPES = 6;
 
         {
+            if (mCSS.isEnabled()) {
+                section = 1;
+            }
+
             using enum MeshRenderInfo::Surface;
             if (mMRS.isSurface(SHADING_FLAT)) {
-                mul = 1;
+                shading = 1;
             }
             if (mMRS.isSurface(SHADING_SMOOTH)) {
-                mul = 2;
+                shading = 2;
             }
             if (mMRS.isSurface(SHADING_NORMAL_MAP)) {
-                mul = 3;
+                shading = 3;
             }
             if (mMRS.isSurface(COLOR_MESH)) {
-                off = 1;
+                color = 1;
             }
             if (mMRS.isSurface(COLOR_FACE)) {
-                off = 2;
+                color = 2;
             }
             if (mMRS.isSurface(COLOR_USER)) {
-                off = 3;
+                color = 3;
             }
             if (mMRS.isSurface(COLOR_VERTEX_TEX)) {
-                off = 4;
+                color = 4;
             }
             if (mMRS.isSurface(COLOR_WEDGE_TEX)) {
-                off = 5;
+                color = 5;
             }
         }
 
-        VertFragProgram p = static_cast<VertFragProgram>(6 * mul + off);
+        uint program = section * N_SHADING_TYPES * N_COLOR_TYPES + shading * N_COLOR_TYPES + color;
+
+        VertFragProgram p = static_cast<VertFragProgram>(program);
 
         return surfaceProgramHandles[toUnderlying(p)];
     }
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh
index 7faf264a3d..175ec36dc8 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh
@@ -36,7 +36,9 @@ DECLARE_FETCH_VEC3(fetchPrimitiveNormal, primitiveNormals);
 
 void main()
 {
+#ifdef SURFACE_SECTION_ENABLED
     discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+#endif
 
     // color
     vec4 color = vec4(0.0, 0.0, 0.0, 1.0);
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config
index 79223d23b9..b63f77f6f9 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config
@@ -1,13 +1,18 @@
 ENUM_PREFIX DRAWABLE_MESH_SURFACE
 DEFINE_PREFIX SURFACE
 
-# VS is static (not generated for each combination)
-VS_FILE vs_surface.sc
+# VS is generated dynamically based on combinations
+VS_IN vs_surface_in.sh
+VS_PREFIX vs_surface
 
 # FS is generated dynamically based on combinations
 FS_IN fs_surface_in.sh
 FS_PREFIX fs_surface
 
+DIM_BOTH SECTION
+    ENABLED
+    DISABLED
+
 DIM_FS SHADING
     FLAT
     NONE
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh
similarity index 95%
rename from vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
rename to vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh
index 7023dc54a0..aea0b71564 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh
@@ -18,7 +18,6 @@ void main()
 {
     gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0));
     v_position = mul(u_modelView, vec4(a_position, 1.0)).xyz;
-    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     v_normal = normalize(mul(u_normalMatrix, a_normal));
     v_texcoord0 = a_texcoord0;
     v_texcoord1 = a_texcoord1;
@@ -28,6 +27,11 @@ void main()
     // default case - color is taken from buffer
     v_color = a_color0;
 
+#ifdef SURFACE_SECTION_ENABLED
+    v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     // discard flag - used to discard the whole vertex, but in fragment shader
     v_discardFlag = computeDiscardFlag(v_worldPos);
+#else
+    v_discardFlag = 1;
+#endif
 }

From eea26290a6ade10e307573749190f611a4f92851 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 1 Jul 2026 17:29:29 +0200
Subject: [PATCH 40/49] [render] fix dx error: initialize unused varying
 variables with default zero values

---
 .../bgfx/drawable/drawable_mesh/points/varying.def.sc     | 4 ++--
 .../bgfx/drawable/drawable_mesh/points_id/varying.def.sc  | 4 ++--
 .../drawable/drawable_mesh/points_instance/varying.def.sc | 4 ++--
 .../drawable_mesh/points_instance_id/varying.def.sc       | 4 ++--
 .../bgfx/drawable/drawable_mesh/surface/varying.def.sc    | 4 ++--
 .../bgfx/drawable/drawable_mesh/surface_id/varying.def.sc | 4 ++--
 .../drawable/drawable_mesh/surface_pbr/varying.def.sc     | 4 ++--
 .../primitives/lines/cpu_generated_lines/varying.def.sc   | 8 ++++----
 .../bgfx/primitives/lines/primitive_lines/varying.def.sc  | 4 ++--
 9 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc
index 02aaa3f794..38297e8aba 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points/varying.def.sc
@@ -13,5 +13,5 @@ vec3 v_position  : TANGENT;
 vec3 v_normal    : NORMAL;
 vec4 v_color     : COLOR0;
 
-vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
-float v_discardFlag : TEXCOORD1; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD0 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD1 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc
index 6bab48c21f..accca66c61 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_id/varying.def.sc
@@ -7,5 +7,5 @@
 
 vec3 a_position  : POSITION;
 
-vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
-float v_discardFlag : TEXCOORD1; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD0 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD1 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
index c11bd498b8..187d84648c 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance/varying.def.sc
@@ -11,5 +11,5 @@ vec3 a_normal    : NORMAL;
 vec3 v_normal    : NORMAL;
 vec2 v_texcoord0 : TEXCOORD0;
 
-vec3  v_worldPos    : TEXCOORD1; // unused texcoord semantic
-float v_discardFlag : TEXCOORD2; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD1 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD2 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc
index cba34333ea..aa3ee3a154 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/points_instance_id/varying.def.sc
@@ -9,5 +9,5 @@ vec3 a_position  : POSITION;
 
 vec2 v_texcoord0 : TEXCOORD0;
 
-vec3  v_worldPos    : TEXCOORD1; // unused texcoord semantic
-float v_discardFlag : TEXCOORD2; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD1 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD2 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
index 53b09298e3..c35f7fcb34 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/varying.def.sc
@@ -19,5 +19,5 @@ vec4 v_color     : COLOR0;
 vec2 v_texcoord0 : TEXCOORD0;
 vec2 v_texcoord1 : TEXCOORD1;
 
-vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD3 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD4 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
index 6bab48c21f..accca66c61 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_id/varying.def.sc
@@ -7,5 +7,5 @@
 
 vec3 a_position  : POSITION;
 
-vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
-float v_discardFlag : TEXCOORD1; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD0 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD1 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_pbr/varying.def.sc b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_pbr/varying.def.sc
index 53b09298e3..c35f7fcb34 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_pbr/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface_pbr/varying.def.sc
@@ -19,5 +19,5 @@ vec4 v_color     : COLOR0;
 vec2 v_texcoord0 : TEXCOORD0;
 vec2 v_texcoord1 : TEXCOORD1;
 
-vec3  v_worldPos    : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD3 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD4 = 0;
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
index 6c1b80edf4..c3e38521a1 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/cpu_generated_lines/varying.def.sc
@@ -15,7 +15,7 @@ vec3 a_texcoord1 : TEXCOORD1; // n1
 vec4 v_color  : COLOR0;
 vec3 v_normal : NORMAL;
 
-vec3  v_worldPos0   : TEXCOORD2; // unused texcoord semantic
-vec3  v_worldPos1   : TEXCOORD3; // unused texcoord semantic
-float v_discardFlag : TEXCOORD4; // unused texcoord semantic
-float v_t           : TEXCOORD5; // interpolation parameter along segment
+vec3  v_worldPos0   : TEXCOORD2 = vec3(0.0, 0.0, 0.0);
+vec3  v_worldPos1   : TEXCOORD3 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD4 = 0;
+float v_t           : TEXCOORD5 = 0; // interpolation parameter along segment
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc
index 4aeba197ca..e01f116bec 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/primitive_lines/varying.def.sc
@@ -12,5 +12,5 @@ vec4 a_color0    : COLOR0;    // c0
 vec4 v_color     : COLOR0;    // vertex color
 vec3 v_normal    : NORMAL;
 
-vec3  v_worldPos    : TEXCOORD0; // unused texcoord semantic
-float v_discardFlag : TEXCOORD1; // unused texcoord semantic
+vec3  v_worldPos    : TEXCOORD0 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD1 = 0;

From b7ba307a49d040b5643a2ac5aeedaf587665a013 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Thu, 2 Jul 2026 16:00:00 +0200
Subject: [PATCH 41/49] [render] Rename SECTION dimension from ENABLED/DISABLED
 to ON/OFF in shaders

---
 vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h | 2 +-
 .../bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh      | 2 +-
 .../vclib/bgfx/drawable/drawable_mesh/surface/surface.config  | 4 ++--
 .../bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh      | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
index 3ff06aa676..dae98ce68e 100644
--- a/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
+++ b/vclib/render/include/vclib/bgfx/drawable/drawable_mesh_bgfx.h
@@ -505,7 +505,7 @@ class DrawableMeshBGFX : public AbstractDrawableMesh, public MeshType
         // the first shader of all the combinations
         uint base = toUnderlying(
             VertFragProgram::
-                DRAWABLE_MESH_SURFACE_SECTION_ENABLED_SHADING_FLAT_COLOR_FACE);
+                DRAWABLE_MESH_SURFACE_SECTION_ON_SHADING_FLAT_COLOR_FACE);
 
         // matrix is generated from surface.config:
         // SECTION x SHADING x COLOR x SELECTION
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh
index 175ec36dc8..49ee2a36bd 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/fs_surface_in.sh
@@ -36,7 +36,7 @@ DECLARE_FETCH_VEC3(fetchPrimitiveNormal, primitiveNormals);
 
 void main()
 {
-#ifdef SURFACE_SECTION_ENABLED
+#ifdef SURFACE_SECTION_ON
     discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
 #endif
 
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config
index b63f77f6f9..cabe63772d 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/surface.config
@@ -10,8 +10,8 @@ FS_IN fs_surface_in.sh
 FS_PREFIX fs_surface
 
 DIM_BOTH SECTION
-    ENABLED
-    DISABLED
+    ON
+    OFF
 
 DIM_FS SHADING
     FLAT
diff --git a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh
index aea0b71564..a6db274983 100644
--- a/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/drawable/drawable_mesh/surface/vs_surface_in.sh
@@ -27,7 +27,7 @@ void main()
     // default case - color is taken from buffer
     v_color = a_color0;
 
-#ifdef SURFACE_SECTION_ENABLED
+#ifdef SURFACE_SECTION_ON
     v_worldPos = mul(u_model[0], vec4(a_position, 1.0)).xyz;
     // discard flag - used to discard the whole vertex, but in fragment shader
     v_discardFlag = computeDiscardFlag(v_worldPos);

From 115faa8b2e395109b50cbdffea4c6f608b059c61 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 15 Jul 2026 17:40:18 +0200
Subject: [PATCH 42/49] [render] Synchronize cross section settings and
 bounding boxes in apply-to-all mode

---
 .../render/settings/cross_section_settings.h  | 10 ++-
 vclib/render/src/vclib/qt/mesh_viewer.cpp     | 72 +++++++++++++++++--
 2 files changed, 74 insertions(+), 8 deletions(-)

diff --git a/vclib/render/include/vclib/render/settings/cross_section_settings.h b/vclib/render/include/vclib/render/settings/cross_section_settings.h
index bb1567d74c..d486d347aa 100644
--- a/vclib/render/include/vclib/render/settings/cross_section_settings.h
+++ b/vclib/render/include/vclib/render/settings/cross_section_settings.h
@@ -74,8 +74,14 @@ class CrossSectionSettings
     void setBoundingBox(const Box3f& bbox)
     {
         if (!bbox.isNull()) {
-            mLower = Point3f::min();
-            mUpper = Point3f::max();
+            for (int i = 0; i < 3; ++i) {
+                if (mLower[i] <= mBBox.min()[i]) {
+                    mLower[i] = bbox.min()[i];
+                }
+                if (mUpper[i] >= mBBox.max()[i]) {
+                    mUpper[i] = bbox.max()[i];
+                }
+            }
 
             mBBox = bbox;
 
diff --git a/vclib/render/src/vclib/qt/mesh_viewer.cpp b/vclib/render/src/vclib/qt/mesh_viewer.cpp
index f906c74046..a08174cd05 100644
--- a/vclib/render/src/vclib/qt/mesh_viewer.cpp
+++ b/vclib/render/src/vclib/qt/mesh_viewer.cpp
@@ -292,10 +292,23 @@ void MeshViewer::updateGUI()
             if (!mUI->meshRenderSettingsFrame->isApplyToAllEnabled()) {
                 mUI->meshRenderSettingsFrame->setMeshRenderSettings(
                     m->renderSettings(), true);
+                mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+                    m->crossSectionSettings());
+            }
+            else {
+                vcl::Box3f globalBox;
+                for (uint j = 0; j < mDrawableObjectVector->size(); ++j) {
+                    auto mesh = std::dynamic_pointer_cast<AbstractDrawableMesh>(
+                        mDrawableObjectVector->at(j));
+                    if (mesh) {
+                        globalBox.add(mesh->crossSectionSettings().boundingBox());
+                    }
+                }
+                auto css = mUI->meshRenderSettingsFrame->crossSectionSettings();
+                css.setBoundingBox(globalBox);
+                mUI->meshRenderSettingsFrame->setCrossSectionSettings(css);
             }
             mUI->meshRenderSettingsFrame->setEnabled(true);
-            mUI->meshRenderSettingsFrame->setCrossSectionSettings(
-                m->crossSectionSettings());
         }
         else {
             mUI->meshRenderSettingsFrame->setEnabled(false);
@@ -324,6 +337,8 @@ void MeshViewer::visibilityDrawableObjectChanged()
             if (!mUI->meshRenderSettingsFrame->isApplyToAllEnabled()) {
                 mUI->meshRenderSettingsFrame->setMeshRenderSettings(
                     m->renderSettings());
+                mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+                    m->crossSectionSettings());
             }
         }
         mUI->viewer->update();
@@ -348,6 +363,8 @@ void MeshViewer::selectedDrawableObjectChanged(uint i)
         if (!mUI->meshRenderSettingsFrame->isApplyToAllEnabled()) {
             mUI->meshRenderSettingsFrame->setMeshRenderSettings(
                 m->renderSettings());
+            mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+                m->crossSectionSettings());
         }
         mUI->meshRenderSettingsFrame->setEnabled(true);
     }
@@ -412,10 +429,21 @@ void MeshViewer::crossSectionSettingsUpdated()
         auto m = std::dynamic_pointer_cast<AbstractDrawableMesh>(
             mDrawableObjectVector->at(i));
         if (m) { // just to be sure, but it should always be true
-            // get CrossSectionSettings from the CrossSectionSettingsFrame, and
-            // set it to the AbstractDrawableMesh
-            m->setCrossSectionSettings(
-                mUI->meshRenderSettingsFrame->crossSectionSettings());
+            bool applyToAll = mUI->meshRenderSettingsFrame->isApplyToAllEnabled();
+            const auto& newSettings = mUI->meshRenderSettingsFrame->crossSectionSettings();
+
+            if (applyToAll) {
+                for (uint j = 0; j < mDrawableObjectVector->size(); ++j) {
+                    auto mesh = std::dynamic_pointer_cast<AbstractDrawableMesh>(
+                        mDrawableObjectVector->at(j));
+                    if (mesh) {
+                        mesh->setCrossSectionSettings(newSettings);
+                    }
+                }
+            }
+            else {
+                m->setCrossSectionSettings(newSettings);
+            }
             mUI->viewer->update();
         }
     }
@@ -424,6 +452,23 @@ void MeshViewer::crossSectionSettingsUpdated()
 void MeshViewer::applyToAllToggled(bool checked)
 {
     if (!checked) {
+        // Restore individual bounding boxes for all meshes
+        for (uint j = 0; j < mDrawableObjectVector->size(); ++j) {
+            auto mesh = std::dynamic_pointer_cast<AbstractDrawableMesh>(
+                mDrawableObjectVector->at(j));
+            if (mesh) {
+                auto css = mesh->crossSectionSettings();
+                auto bbox = mesh->boundingBox().cast<float>();
+                if (!bbox.isNull()) {
+                    float eps = bbox.diagonal() * 0.02f;
+                    bbox.min() -= eps;
+                    bbox.max() += eps;
+                }
+                css.setBoundingBox(bbox);
+                mesh->setCrossSectionSettings(css);
+            }
+        }
+
         uint i = mUI->drawVectorTree->selectedDrawableObject();
         if (i != UINT_NULL && mDrawableObjectVector->size() > 0) {
             auto m = std::dynamic_pointer_cast<AbstractDrawableMesh>(
@@ -431,11 +476,26 @@ void MeshViewer::applyToAllToggled(bool checked)
             if (m) {
                 mUI->meshRenderSettingsFrame->setMeshRenderSettings(
                     m->renderSettings());
+                mUI->meshRenderSettingsFrame->setCrossSectionSettings(
+                    m->crossSectionSettings());
             }
         }
     }
     else {
+        vcl::Box3f globalBox;
+        for (uint j = 0; j < mDrawableObjectVector->size(); ++j) {
+            auto mesh = std::dynamic_pointer_cast<AbstractDrawableMesh>(
+                mDrawableObjectVector->at(j));
+            if (mesh) {
+                globalBox.add(mesh->crossSectionSettings().boundingBox());
+            }
+        }
+        auto css = mUI->meshRenderSettingsFrame->crossSectionSettings();
+        css.setBoundingBox(globalBox);
+        mUI->meshRenderSettingsFrame->setCrossSectionSettings(css);
+
         meshRenderSettingsUpdated();
+        crossSectionSettingsUpdated();
     }
 }
 

From 2ad642130577b252f5f1f18b1efe105bc7264705 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Wed, 15 Jul 2026 18:58:10 +0200
Subject: [PATCH 43/49] [render] Add step size control for cross section
 precision with spin box and logic

---
 .../cross_section_settings_frame.h            |  3 ++
 .../cross_section_settings_frame.cpp          | 49 +++++++++++++++++++
 .../cross_section_settings_frame.ui           | 37 ++++++++++++++
 3 files changed, 89 insertions(+)

diff --git a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
index 8e020d7c98..3d3bd5908b 100644
--- a/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
+++ b/vclib/render/include/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.h
@@ -78,10 +78,13 @@ class CrossSectionSettingsFrame : public QFrame
         float lower,
         float upper);
 
+    float mStep = -1.0f;
+
 private slots:
     void onCrossSectionEnabledChanged(Qt::CheckState arg1);
     void onPerVertexToggled(bool checked);
     void onPerFragmentToggled(bool checked);
+    void onStepSpinBoxValueChanged(int value);
 
     void onFloatRangeSliderLowerValueChanged(Axis axis, float value);
     void onFloatRangeSliderUpperValueChanged(Axis axis, float value);
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
index 704bf37798..0f050abea6 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.cpp
@@ -63,6 +63,12 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
         this,
         SLOT(onPerFragmentToggled(bool)));
 
+    connect(
+        mUI->stepSpinBox,
+        SIGNAL(valueChanged(int)),
+        this,
+        SLOT(onStepSpinBoxValueChanged(int)));
+
     for (uint i = X; i < AXIS_COUNT; ++i) {
         connect(
             mFloatSliders[i],
@@ -95,6 +101,8 @@ CrossSectionSettingsFrame::CrossSectionSettingsFrame(
             });
     }
 
+    onStepSpinBoxValueChanged(mUI->stepSpinBox->value());
+    
     updateFrameFromSettings();
 }
 
@@ -157,6 +165,20 @@ void CrossSectionSettingsFrame::updateFrameFromSettings()
     const auto& l  = mCSS.lower();
     const auto& u  = mCSS.upper();
 
+    if (!bb.isNull()) {
+        float minSize = std::numeric_limits<float>::max();
+        for (int i=0; i<3; ++i) {
+            if (bb.dim(i) > 1e-6f && bb.dim(i) < minSize) {
+                minSize = bb.dim(i);
+            }
+        }
+        if (minSize != std::numeric_limits<float>::max()) {
+            int order = static_cast<int>(std::floor(std::log10(minSize)));
+            int maxExp = order - 1;
+            mUI->stepSpinBox->setMaximum(maxExp);
+        }
+    }
+
     for (uint i = X; i < AXIS_COUNT; ++i) {
         updateSlider(
             mFloatSliders[i],
@@ -251,7 +273,10 @@ void CrossSectionSettingsFrame::onFloatRangeSliderLowerValueChanged(
     mMinSpinBoxes[axis]->blockSignals(true);
     mMinSpinBoxes[axis]->setValue(value);
     mMinSpinBoxes[axis]->blockSignals(false);
+    
+    mMaxSpinBoxes[axis]->blockSignals(true);
     mMaxSpinBoxes[axis]->setMinimum(value);
+    mMaxSpinBoxes[axis]->blockSignals(false);
 
     emit crossSectionSettingsUpdated();
 }
@@ -267,7 +292,10 @@ void CrossSectionSettingsFrame::onFloatRangeSliderUpperValueChanged(
     mMaxSpinBoxes[axis]->blockSignals(true);
     mMaxSpinBoxes[axis]->setValue(value);
     mMaxSpinBoxes[axis]->blockSignals(false);
+    
+    mMinSpinBoxes[axis]->blockSignals(true);
     mMinSpinBoxes[axis]->setMaximum(value);
+    mMinSpinBoxes[axis]->blockSignals(false);
 
     emit crossSectionSettingsUpdated();
 }
@@ -286,4 +314,25 @@ void CrossSectionSettingsFrame::onMaxSpinBoxValueChanged(
     mFloatSliders[axis]->setUpperValue(static_cast<float>(value));
 }
 
+void CrossSectionSettingsFrame::onStepSpinBoxValueChanged(int exp)
+{
+    mStep = std::pow(10.0f, static_cast<float>(exp));
+    
+    int decimals = std::max(2, -exp + 1);
+
+    for (uint i = X; i < AXIS_COUNT; ++i) {
+        mFloatSliders[i]->setStep(mStep);
+        
+        mMinSpinBoxes[i]->blockSignals(true);
+        mMinSpinBoxes[i]->setSingleStep(mStep);
+        mMinSpinBoxes[i]->setDecimals(decimals);
+        mMinSpinBoxes[i]->blockSignals(false);
+        
+        mMaxSpinBoxes[i]->blockSignals(true);
+        mMaxSpinBoxes[i]->setSingleStep(mStep);
+        mMaxSpinBoxes[i]->setDecimals(decimals);
+        mMaxSpinBoxes[i]->blockSignals(false);
+    }
+}
+
 } // namespace vcl::qt
diff --git a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
index 5433f7b026..a93f730798 100644
--- a/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
+++ b/vclib/render/src/vclib/qt/gui/mesh_render_settings_frame/cross_section_settings_frame.ui
@@ -222,6 +222,43 @@
         </layout>
        </widget>
       </item>
+      <item row="2" column="0" colspan="2">
+       <layout class="QHBoxLayout" name="stepLayout">
+        <item>
+         <widget class="QLabel" name="stepLabel">
+          <property name="text">
+           <string>Precision (10^x):</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QSpinBox" name="stepSpinBox">
+          <property name="minimum">
+           <number>-6</number>
+          </property>
+          <property name="maximum">
+           <number>6</number>
+          </property>
+          <property name="value">
+           <number>-2</number>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="horizontalSpacer">
+          <property name="orientation">
+           <enum>Qt::Orientation::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>40</width>
+            <height>20</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+       </layout>
+      </item>
      </layout>
     </widget>
    </item>

From f7debb626b25d2202078ba32869f7ce67276f3a0 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 17 Jul 2026 19:26:39 +0200
Subject: [PATCH 44/49] [render] Add cross section support to point rendering
 and relevant shaders

---
 .../bgfx/drawable/mesh/mesh_render_buffers.h  |  1 +
 .../include/vclib/bgfx/primitives/points.h    | 28 ++++++++--
 .../bgfx/primitives/points/fs_points_id_in.sh |  6 +++
 .../bgfx/primitives/points/fs_points_in.sh    |  6 +++
 .../bgfx/primitives/points/points.config      |  8 +++
 .../bgfx/primitives/points/varying.def.sc     | 10 ++--
 .../bgfx/primitives/points/vs_points_in.sh    |  9 ++++
 .../src/vclib/bgfx/primitives/points.cpp      | 53 ++++++++++++++++---
 8 files changed, 106 insertions(+), 15 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h b/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
index 39a6b41912..e55a597aec 100644
--- a/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
+++ b/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
@@ -366,6 +366,7 @@ class MeshRenderBuffers : public MeshRenderData<MeshRenderBuffers<Mesh>>
     {
         mEdgeLines.crossSectionSettings() = css;
         mWireframeLines.crossSectionSettings() = css;
+        mPoints.setCrossSectionSettings(css);
     }
 
 private:
diff --git a/vclib/render/include/vclib/bgfx/primitives/points.h b/vclib/render/include/vclib/bgfx/primitives/points.h
index 56d7e3cca1..1b016c6d45 100644
--- a/vclib/render/include/vclib/bgfx/primitives/points.h
+++ b/vclib/render/include/vclib/bgfx/primitives/points.h
@@ -13,6 +13,8 @@
 #include <vclib/base.h>
 #include <vclib/space/core.h>
 
+#include <vclib/render/settings/cross_section_settings.h>
+
 namespace vcl {
 
 /**
@@ -55,9 +57,10 @@ class Points
         Shading      shading        = Shading::NONE;
         Shape        shape          = Shape::SQUARE;
         Color        generalColor   = Color::Black;
-        float        depthOffset    = 0.0f;
-        Color        selectionColor = Color(0x88FF9732, Color::Format::ABGR);
-        bool         selectionVisibility = false;
+        float                depthOffset    = 0.0f;
+        Color                selectionColor = Color(0x88FF9732, Color::Format::ABGR);
+        bool                 selectionVisibility = false;
+        CrossSectionSettings crossSectionSettings;
     };
 
 private:
@@ -485,6 +488,25 @@ class Points
      */
     const Settings& settings() const { return mSettings; }
 
+    /**
+     * @brief Returns the current cross section settings.
+     * @return The current cross section settings.
+     */
+    const CrossSectionSettings& crossSectionSettings() const
+    {
+        return mSettings.crossSectionSettings;
+    }
+
+    /**
+     * @brief Sets the cross section settings.
+     * @param[in] settings: The cross section settings to apply.
+     */
+    void setCrossSectionSettings(const CrossSectionSettings& settings)
+    {
+        mSettings.crossSectionSettings = settings;
+        mIsUpdateProgramNeeded = true;
+    }
+
     void draw(bgfx::ViewId viewId) const;
 
     void drawId(bgfx::ViewId viewId, uint32_t id) const;
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_id_in.sh b/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_id_in.sh
index d2768d89f8..f2ecf5d896 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_id_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_id_in.sh
@@ -6,12 +6,18 @@
 // obtain one at https://mozilla.org/MPL/2.0/.
 
 $input v_normal, v_texcoord0, v_color, v_selected
+$input v_worldPos, v_discardFlag
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/primitives/uniforms/points_uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh>
 
 void main()
 {
+#if POINTS_ID_SECTION_ON
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+#endif
+
 #if POINTS_ID_SHAPE_CIRCLE
     // circle mode (if outside of the circle, discard)
     vec2 uv = v_texcoord0 * 2.0 - vec2(1.0, 1.0);
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_in.sh b/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_in.sh
index e80643e845..1af888788d 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/primitives/points/fs_points_in.sh
@@ -6,13 +6,19 @@
 // obtain one at https://mozilla.org/MPL/2.0/.
 
 $input v_normal, v_texcoord0, v_color, v_selected
+$input v_worldPos, v_discardFlag
 
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/directional_light_uniforms.sh>
 #include <vclib/bgfx/primitives/uniforms/points_uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh>
 
 void main()
 {
+#if POINTS_SECTION_ON
+    discardIfCrossSectionClipped(v_discardFlag, v_worldPos);
+#endif
+
     vec4 color = v_color;
 
 #if POINTS_SHAPE_CIRCLE
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/points/points.config b/vclib/render/shaders/vclib/bgfx/primitives/points/points.config
index 35a6280466..4d59cc7de5 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/points/points.config
+++ b/vclib/render/shaders/vclib/bgfx/primitives/points/points.config
@@ -25,6 +25,10 @@ DIM_BOTH SELECTION
     OFF
     ON
 
+DIM_BOTH SECTION
+    OFF
+    ON
+
 ENUM_PREFIX PRIMITIVE_POINTS_ID
 DEFINE_PREFIX POINTS_ID
 
@@ -43,3 +47,7 @@ DIM_VS COLOR
 DIM_FS SHAPE
     SQUARE
     CIRCLE
+
+DIM_BOTH SECTION
+    OFF
+    ON
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/points/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/points/varying.def.sc
index 50c4b0442c..2bdf571b2a 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/points/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/points/varying.def.sc
@@ -5,7 +5,9 @@
 // v. 2.0. If a copy of the MPL was not distributed with this file, You can
 // obtain one at https://mozilla.org/MPL/2.0/.
 
-vec3 v_normal          : NORMAL = vec3(0.0, 0.0, 0.0);
-vec2 v_texcoord0       : TEXCOORD0;
-flat vec4 v_color      : COLOR0;
-flat float v_selected  : TEXCOORD1 = 0.0;
+vec3 v_normal            : NORMAL = vec3(0.0, 0.0, 0.0);
+vec2 v_texcoord0         : TEXCOORD0;
+flat vec4 v_color        : COLOR0;
+flat float v_selected    : TEXCOORD1 = 0.0;
+vec3 v_worldPos          : TEXCOORD2 = vec3(0.0, 0.0, 0.0);
+flat float v_discardFlag : TEXCOORD3 = 1.0;
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/points/vs_points_in.sh b/vclib/render/shaders/vclib/bgfx/primitives/points/vs_points_in.sh
index 518a50521e..4fdbd58e29 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/points/vs_points_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/primitives/points/vs_points_in.sh
@@ -6,9 +6,11 @@
 // obtain one at https://mozilla.org/MPL/2.0/.
 
 $output v_normal, v_texcoord0, v_color, v_selected
+$output v_worldPos, v_discardFlag
 
 #include <vclib/bgfx/shaders_common.sh>
 #include <vclib/bgfx/buffers/boolean_buffer.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/primitives/uniforms/points_uniforms.sh>
 
 BUFFER_RO(pointsBuffer, vec4, 0); // 3D point positions
@@ -75,4 +77,11 @@ void main()
 #if POINTS_SELECTION_ON
     v_selected = float(getBoolFromBuffer(vertexSelected, pointIndex));
 #endif
+
+#if defined(POINTS_SECTION_ON) || defined(POINTS_ID_SECTION_ON)
+    v_worldPos = mul(u_model[0], vec4(centerPos, 1.0)).xyz;
+    v_discardFlag = computeDiscardFlag(v_worldPos);
+#else
+    v_discardFlag = 1.0;
+#endif
 }
diff --git a/vclib/render/src/vclib/bgfx/primitives/points.cpp b/vclib/render/src/vclib/bgfx/primitives/points.cpp
index 7c4907f327..81322827b5 100644
--- a/vclib/render/src/vclib/bgfx/primitives/points.cpp
+++ b/vclib/render/src/vclib/bgfx/primitives/points.cpp
@@ -8,6 +8,7 @@
 #include <vclib/bgfx/primitives/points.h>
 
 #include <vclib/bgfx/context.h>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.h>
 #include <vclib/bgfx/primitives/uniforms/points_uniforms.h>
 
 #include <stdexcept>
@@ -163,6 +164,19 @@ void Points::draw(bgfx::ViewId viewId) const
     // Bind the updated uniforms to the shader stage.
     PointsUniforms::bind();
 
+    // cross section settings
+    if (mSettings.crossSectionSettings.isEnabled()) {
+        using enum CrossSectionSettings::CrossSectionType;
+        CrossSectionUniforms::set(
+            mSettings.crossSectionSettings.lower(),
+            mSettings.crossSectionSettings.upper(),
+            mSettings.crossSectionSettings.type() == PER_FRAGMENT);
+    }
+    else {
+        CrossSectionUniforms::set();
+    }
+    CrossSectionUniforms::bind();
+
     bgfx::submit(viewId, mProgram);
 }
 
@@ -201,6 +215,19 @@ void Points::drawId(bgfx::ViewId viewId, uint32_t id) const
     // Bind the updated uniforms to the shader stage.
     PointsUniforms::bind();
 
+    // cross section settings
+    if (mSettings.crossSectionSettings.isEnabled()) {
+        using enum CrossSectionSettings::CrossSectionType;
+        CrossSectionUniforms::set(
+            mSettings.crossSectionSettings.lower(),
+            mSettings.crossSectionSettings.upper(),
+            mSettings.crossSectionSettings.type() == PER_FRAGMENT);
+    }
+    else {
+        CrossSectionUniforms::set();
+    }
+    CrossSectionUniforms::bind();
+
     bgfx::submit(viewId, mIdProgram);
 }
 
@@ -273,23 +300,27 @@ bgfx::ProgramHandle Points::pointsProgramSelector() const
     constexpr uint N_COLOR_MODES     = 2;
     constexpr uint N_SHAPE_MODES     = 2;
     constexpr uint N_SELECTION_MODES = 2;
+    constexpr uint N_SECTION_MODES   = 2;
 
     uint shading = toUnderlying(mSettings.shading);
     uint color   = toUnderlying(mSettings.colorSetting);
     uint shape   = toUnderlying(mSettings.shape);
     uint select  = mSettings.selectionVisibility ? 1 : 0;
+    uint section = mSettings.crossSectionSettings.isEnabled() ? 1 : 0;
 
     // the first shader of all the combinations
     uint base = toUnderlying(
-        PRIMITIVE_POINTS_SHADING_NONE_COLOR_GENERAL_SHAPE_SQUARE_SELECTION_OFF);
+        PRIMITIVE_POINTS_SHADING_NONE_COLOR_GENERAL_SHAPE_SQUARE_SELECTION_OFF_SECTION_OFF);
 
     // matrix is generated from points.config
-    // SHADING x COLOR x SHAPE x SELECTION
+    // SHADING x COLOR x SHAPE x SELECTION x SECTION
 
     uint program = base +
-                   shading * N_COLOR_MODES * N_SHAPE_MODES * N_SELECTION_MODES +
-                   color * N_SHAPE_MODES * N_SELECTION_MODES +
-                   shape * N_SELECTION_MODES + select;
+                   shading * N_COLOR_MODES * N_SHAPE_MODES * N_SELECTION_MODES * N_SECTION_MODES +
+                   color * N_SHAPE_MODES * N_SELECTION_MODES * N_SECTION_MODES +
+                   shape * N_SELECTION_MODES * N_SECTION_MODES + 
+                   select * N_SECTION_MODES + 
+                   section;
 
     ProgramManager& pm = Context::instance().programManager();
     return pm.getProgram(VertFragProgram(program));
@@ -305,13 +336,19 @@ bgfx::ProgramHandle Points::pointsIdProgramSelector() const
 {
     using enum VertFragProgram;
 
-    uint shape = toUnderlying(mSettings.shape);
+    constexpr uint N_SHAPE_MODES     = 2;
+    constexpr uint N_SECTION_MODES   = 2;
+
+    uint shape   = toUnderlying(mSettings.shape);
+    uint section = mSettings.crossSectionSettings.isEnabled() ? 1 : 0;
 
     // the first shader of all the combinations
     uint base = toUnderlying(
-        PRIMITIVE_POINTS_ID_SHADING_NONE_COLOR_GENERAL_SHAPE_SQUARE);
+        PRIMITIVE_POINTS_ID_SHADING_NONE_COLOR_GENERAL_SHAPE_SQUARE_SECTION_OFF);
 
-    uint program = base + shape;
+    uint program = base + 
+                   shape * N_SECTION_MODES + 
+                   section;
 
     ProgramManager& pm = Context::instance().programManager();
     return pm.getProgram(VertFragProgram(program));

From 1e82844e938f695339d074e75e905512185f3b49 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Fri, 31 Jul 2026 19:00:05 +0200
Subject: [PATCH 45/49] [tests] add cross section tests

---
 ...ace-headless_cross_section_fragment_gt.png | Bin 0 -> 8308808 bytes
 ...rface-headless_cross_section_vertex_gt.png | Bin 0 -> 8308808 bytes
 .../render/002-mesh-surface-headless/main.cpp |  44 ++++++++++++++++++
 3 files changed, 44 insertions(+)
 create mode 100644 assets/ground_truth/002-mesh-surface-headless_cross_section_fragment_gt.png
 create mode 100644 assets/ground_truth/002-mesh-surface-headless_cross_section_vertex_gt.png

diff --git a/assets/ground_truth/002-mesh-surface-headless_cross_section_fragment_gt.png b/assets/ground_truth/002-mesh-surface-headless_cross_section_fragment_gt.png
new file mode 100644
index 0000000000000000000000000000000000000000..60bdb18d860b8257a243e4cb347284e2ab139962
GIT binary patch
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zXx+;@2@oJafB*pk1PBlyK!5-N0t5&UAV7cs0RjZt6c7ft3Fhqt2oOjvFy-TKZQ0SW
z?wLad4IGjDG$#-sK!5-N0t5&UAV7cs0RjXF5FkK+009C7Iulrb^^XQ_JpQ&lKY4A)
N9(xVCcDF;m_kV0mr2hZ_

literal 0
HcmV?d00001

diff --git a/tests/render/002-mesh-surface-headless/main.cpp b/tests/render/002-mesh-surface-headless/main.cpp
index 404ee5cfdf..c0b75b06d0 100644
--- a/tests/render/002-mesh-surface-headless/main.cpp
+++ b/tests/render/002-mesh-surface-headless/main.cpp
@@ -287,3 +287,47 @@ TEST_CASE("Mesh Surface Selection")
         });
     }
 }
+
+TEST_CASE("Mesh Surface Cross Section")
+{
+    SECTION("Vertex Cross Section")
+    {
+        runRenderTest("cross_section_vertex", [](vcl::HeadlessMeshViewer& mv) {
+            auto mesh = getDrawableMesh<vcl::TriMesh>("bimba.obj");
+
+            vcl::CrossSectionSettings css(mesh);
+            css.type() =
+                vcl::CrossSectionSettings::CrossSectionType::PER_VERTEX;
+
+            vcl::Point3f min = css.boundingBox().min();
+            vcl::Point3f max = css.boundingBox().max();
+            css.setLowerUpper(min + (max - min) * 0.25f,
+                              max - (max - min) * 0.25f);
+
+            mesh.setCrossSectionSettings(css);
+
+            mv.pushDrawableObject(std::move(mesh));
+        });
+    }
+
+    SECTION("Fragment Cross Section")
+    {
+        runRenderTest("cross_section_fragment", [](vcl::HeadlessMeshViewer& mv) {
+            auto mesh = getDrawableMesh<vcl::TriMesh>("bimba.obj");
+
+            vcl::CrossSectionSettings css(mesh);
+            css.type() =
+                vcl::CrossSectionSettings::CrossSectionType::PER_FRAGMENT;
+
+            vcl::Point3f min = css.boundingBox().min();
+            vcl::Point3f max = css.boundingBox().max();
+            css.setLowerUpper(min + (max - min) * 0.25f,
+                              max - (max - min) * 0.25f);
+
+            mesh.setCrossSectionSettings(css);
+
+            mv.pushDrawableObject(std::move(mesh));
+        });
+    }
+}
+

From 8f628fd2aaee2fbd95741875f607ce45d11dddc1 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Sun, 2 Aug 2026 17:45:44 +0200
Subject: [PATCH 46/49] [render] using StaticUniforms for CrossSectionSettings

---
 .../drawable/uniforms/cross_section_uniforms.h | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
index 0bf9b5a6e1..104687db05 100644
--- a/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
+++ b/vclib/render/include/vclib/bgfx/drawable/uniforms/cross_section_uniforms.h
@@ -23,7 +23,7 @@
 #ifndef VCL_BGFX_DRAWABLE_UNIFORMS_CROSS_SECTION_UNIFORMS_H
 #define VCL_BGFX_DRAWABLE_UNIFORMS_CROSS_SECTION_UNIFORMS_H
 
-#include <vclib/bgfx/uniform.h>
+#include <vclib/bgfx/static_uniform.h>
 
 #include <vclib/space/core.h>
 
@@ -46,8 +46,12 @@ class CrossSectionUniforms
         0.0                 // unused
     };
 
-    inline static Uniform sCrossSectionMinDataUniform;
-    inline static Uniform sCrossSectionMaxDataUniform;
+    inline static StaticUniform sCrossSectionMinDataUniform {
+        "u_crossSectionMinData",
+        bgfx::UniformType::Vec4};
+    inline static StaticUniform sCrossSectionMaxDataUniform {
+        "u_crossSectionMaxData",
+        bgfx::UniformType::Vec4};
 
 public:
     CrossSectionUniforms() = delete;
@@ -69,14 +73,6 @@ class CrossSectionUniforms
 
     static void bind()
     {
-        // lazy initialization
-        // to avoid creating uniforms before bgfx is initialized
-        if (!sCrossSectionMinDataUniform.isValid())
-            sCrossSectionMinDataUniform =
-                Uniform("u_crossSectionMinData", bgfx::UniformType::Vec4);
-        if (!sCrossSectionMaxDataUniform.isValid())
-            sCrossSectionMaxDataUniform =
-                Uniform("u_crossSectionMaxData", bgfx::UniformType::Vec4);
         sCrossSectionMinDataUniform.bind(sCrossSectionMinData.data());
         sCrossSectionMaxDataUniform.bind(sCrossSectionMaxData.data());
     }

From 28bbd629490e080bff94617ea77c5f6775494eb6 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 4 Aug 2026 21:15:30 +0200
Subject: [PATCH 47/49] [render] cross section working on new primitive lines

---
 .../bgfx/drawable/mesh/mesh_render_buffers.h  |  4 +-
 .../include/vclib/bgfx/primitives/lines.h     | 10 ++---
 .../bgfx/primitives/lines/fs_lines_id_in.sh   |  8 ++++
 .../bgfx/primitives/lines/fs_lines_in.sh      | 13 ++++--
 .../vclib/bgfx/primitives/lines/lines.config  |  8 ++++
 .../bgfx/primitives/lines/varying.def.sc      |  5 +++
 .../bgfx/primitives/lines/vs_lines_in.sh      | 32 +++++++++++++++
 .../src/vclib/bgfx/primitives/lines.cpp       | 40 +++++++++++++++++--
 8 files changed, 106 insertions(+), 14 deletions(-)

diff --git a/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h b/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
index 46336fd70c..44fd706ea4 100644
--- a/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
+++ b/vclib/render/include/vclib/bgfx/drawable/mesh/mesh_render_buffers.h
@@ -408,8 +408,8 @@ class MeshRenderBuffers : public MeshRenderData<MeshRenderBuffers<Mesh>>
 
     void updateCrossSectionSettings(const CrossSectionSettings& css)
     {
-        mEdgeLines.crossSectionSettings() = css;
-        mWireframeLines.crossSectionSettings() = css;
+        mEdgeLines.setCrossSectionSettings(css);
+        mWireframeLines.setCrossSectionSettings(css);
         mPoints.setCrossSectionSettings(css);
     }
 
diff --git a/vclib/render/include/vclib/bgfx/primitives/lines.h b/vclib/render/include/vclib/bgfx/primitives/lines.h
index 00238abe7f..52122db114 100644
--- a/vclib/render/include/vclib/bgfx/primitives/lines.h
+++ b/vclib/render/include/vclib/bgfx/primitives/lines.h
@@ -154,13 +154,13 @@ class Lines
     }
 
     /**
-     * @brief Returns a reference to the current cross section settings. This
-     * allows to modify the settings directly.
-     * @return A reference to the current cross section settings.
+     * @brief Sets the cross section settings.
+     * @param[in] settings: The cross section settings to apply.
      */
-    CrossSectionSettings& crossSectionSettings()
+    void setCrossSectionSettings(const CrossSectionSettings& settings)
     {
-        return mCrossSectionSettings;
+        mCrossSectionSettings  = settings;
+        mIsUpdateProgramNeeded = true;
     }
 
     /**
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_id_in.sh b/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_id_in.sh
index 2b365593d4..b951e560c8 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_id_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_id_in.sh
@@ -7,9 +7,17 @@
 
 $input v_color, v_normal
 
+// cross section
+$input v_worldPos0, v_worldPos1, v_discardFlag, v_t
+
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/primitives/uniforms/lines_uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh>
 
 void main() {
+#if LINES_ID_SECTION_ON
+    vec3 fragPos = mix(v_worldPos0, v_worldPos1, v_t);
+    discardIfCrossSectionClipped(v_discardFlag, fragPos);
+#endif
     gl_FragColor = u_linesId;
 }
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_in.sh b/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_in.sh
index 454592b8e7..fe2ec1f7d1 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/fs_lines_in.sh
@@ -7,13 +7,20 @@
 
 $input v_color, v_normal
 
-#include <bgfx_shader.sh>
-#if LINES_SHADING_PER_VERTEX || LINES_SHADING_PER_LINE
+// cross section
+$input v_worldPos0, v_worldPos1, v_discardFlag, v_t
+
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/drawable/uniforms/directional_light_uniforms.sh>
-#endif
+
 #include <vclib/bgfx/shaders_common.sh> 
 
 void main() {
+#if LINES_SECTION_ON
+    vec3 fragPos = mix(v_worldPos0, v_worldPos1, v_t);
+    discardIfCrossSectionClipped(v_discardFlag, fragPos);
+#endif
+
     vec4 color = v_color;
     
 #if LINES_SHADING_PER_VERTEX || LINES_SHADING_PER_LINE
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/lines.config b/vclib/render/shaders/vclib/bgfx/primitives/lines/lines.config
index 673f3db715..40f6a99c46 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/lines.config
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/lines.config
@@ -27,6 +27,10 @@ DIM_VS COLOR
     PER_LINE
     GENERAL
 
+DIM_BOTH SECTION
+    OFF
+    ON
+
 ENUM_PREFIX PRIMITIVE_LINES_ID
 DEFINE_PREFIX LINES
 
@@ -49,3 +53,7 @@ DIM_VS TOPO
 
 DIM_VS COLOR
     GENERAL
+
+DIM_BOTH SECTION
+    OFF
+    ON
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/varying.def.sc b/vclib/render/shaders/vclib/bgfx/primitives/lines/varying.def.sc
index 884ddd91e4..fa2a5b7052 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/varying.def.sc
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/varying.def.sc
@@ -7,3 +7,8 @@
 
 vec4 v_color : COLOR0;
 vec3 v_normal : NORMAL;
+
+vec3  v_worldPos0   : TEXCOORD2 = vec3(0.0, 0.0, 0.0);
+vec3  v_worldPos1   : TEXCOORD3 = vec3(0.0, 0.0, 0.0);
+float v_discardFlag : TEXCOORD4 = 0;
+float v_t           : TEXCOORD5 = 0; // interpolation parameter along segment
diff --git a/vclib/render/shaders/vclib/bgfx/primitives/lines/vs_lines_in.sh b/vclib/render/shaders/vclib/bgfx/primitives/lines/vs_lines_in.sh
index 90fecd4d14..7eedf72bd8 100644
--- a/vclib/render/shaders/vclib/bgfx/primitives/lines/vs_lines_in.sh
+++ b/vclib/render/shaders/vclib/bgfx/primitives/lines/vs_lines_in.sh
@@ -7,7 +7,11 @@
 
 $output v_color, v_normal
 
+// cross section
+$output v_worldPos0, v_worldPos1, v_discardFlag, v_t
+
 #include <bgfx_shader.sh>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.sh>
 #include <vclib/bgfx/shaders_common.sh>
 #include <vclib/bgfx/primitives/uniforms/lines_uniforms.sh>
 
@@ -62,6 +66,12 @@ void main() {
     vec3 p0 = getVertexPos(vertexIndex0);
     vec3 p1 = getVertexPos(vertexIndex1);
 
+#if defined(LINES_SECTION_ON) || defined(LINES_ID_SECTION_ON)
+    // compute initial world positions
+    vec3 worldP0 = mul(u_model[0], vec4(p0, 1.0)).xyz;
+    vec3 worldP1 = mul(u_model[0], vec4(p1, 1.0)).xyz;
+#endif
+
     vec4 p0_NDC = mul(u_modelViewProj, vec4(p0, 1.0));
     vec4 p1_NDC = mul(u_modelViewProj, vec4(p1, 1.0));
 
@@ -98,18 +108,28 @@ void main() {
     vec4 clippedColor1 = c1;
     vec3 clippedNormal0 = n0_NDC;
     vec3 clippedNormal1 = n1_NDC;
+#if defined(LINES_SECTION_ON) || defined(LINES_ID_SECTION_ON)
+    vec3 clippedWorldP0 = worldP0;
+    vec3 clippedWorldP1 = worldP1;
+#endif
 
     if (p0_NDC.w < NEAR_EPSILON) {
         float t = (NEAR_EPSILON - p0_NDC.w) / (p1_NDC.w - p0_NDC.w);
         clippedP0 = mix(p0_NDC, p1_NDC, t);
         clippedColor0 = mix(c0, c1, t);
         clippedNormal0 = mix(n0_NDC, n1_NDC, t);
+#if defined(LINES_SECTION_ON) || defined(LINES_ID_SECTION_ON)
+        clippedWorldP0 = mix(worldP0, worldP1, t);
+#endif
     }
     if (p1_NDC.w < NEAR_EPSILON) {
         float t = (NEAR_EPSILON - p1_NDC.w) / (p0_NDC.w - p1_NDC.w);
         clippedP1 = mix(p1_NDC, p0_NDC, t);
         clippedColor1 = mix(c1, c0, t);
         clippedNormal1 = mix(n1_NDC, n0_NDC, t);
+#if defined(LINES_SECTION_ON) || defined(LINES_ID_SECTION_ON)
+        clippedWorldP1 = mix(worldP1, worldP0, t);
+#endif
     }
 
     const vec2 offsets[6] = {
@@ -144,6 +164,18 @@ void main() {
     v_color = color;
     v_normal = normal;
 
+#if defined(LINES_SECTION_ON) || defined(LINES_ID_SECTION_ON)
+    v_worldPos0 = clippedWorldP0;
+    v_worldPos1 = clippedWorldP1;
+    v_t = uv.x;
+    // discard flag - 1.0 if either endpoint is outside the cross section
+    // (only used in per-vertex mode; in per-fragment mode computeDiscardFlag returns 0.0)
+    v_discardFlag =
+        max(computeDiscardFlag(v_worldPos0), computeDiscardFlag(v_worldPos1));
+#else
+    v_discardFlag = 1.0;
+#endif
+
     // Apply depth offset in clip space.
     // We scale the offset by w to maintain it consistently after the perspective divide.
     p.z += -u_depthOffset * p.w;
diff --git a/vclib/render/src/vclib/bgfx/primitives/lines.cpp b/vclib/render/src/vclib/bgfx/primitives/lines.cpp
index 25d160b3d3..46367af6d7 100644
--- a/vclib/render/src/vclib/bgfx/primitives/lines.cpp
+++ b/vclib/render/src/vclib/bgfx/primitives/lines.cpp
@@ -8,6 +8,7 @@
 #include <vclib/bgfx/primitives/lines.h>
 
 #include <vclib/bgfx/context.h>
+#include <vclib/bgfx/drawable/uniforms/cross_section_uniforms.h>
 #include <vclib/bgfx/primitives/uniforms/lines_uniforms.h>
 #include <vclib/bgfx/programs/vert_frag_loader.h>
 
@@ -115,6 +116,19 @@ void Lines::draw(bgfx::ViewId viewId) const
         0 | BGFX_STATE_WRITE_RGB | BGFX_STATE_WRITE_A | BGFX_STATE_WRITE_Z |
         BGFX_STATE_DEPTH_TEST_LESS | BGFX_STATE_BLEND_ALPHA);
     LinesUniforms::bind();
+
+    if (mCrossSectionSettings.isEnabled()) {
+        using enum CrossSectionSettings::CrossSectionType;
+        CrossSectionUniforms::set(
+            mCrossSectionSettings.lower(),
+            mCrossSectionSettings.upper(),
+            mCrossSectionSettings.type() == PER_FRAGMENT);
+    }
+    else {
+        CrossSectionUniforms::set();
+    }
+    CrossSectionUniforms::bind();
+
     bgfx::submit(viewId, mProgram);
 }
 
@@ -143,6 +157,19 @@ void Lines::drawId(bgfx::ViewId viewId, uint32_t id) const
         BGFX_STATE_DEPTH_TEST_LEQUAL |
         BGFX_STATE_BLEND_FUNC(BGFX_STATE_BLEND_ONE, BGFX_STATE_BLEND_ZERO));
     LinesUniforms::bind();
+
+    if (mCrossSectionSettings.isEnabled()) {
+        using enum CrossSectionSettings::CrossSectionType;
+        CrossSectionUniforms::set(
+            mCrossSectionSettings.lower(),
+            mCrossSectionSettings.upper(),
+            mCrossSectionSettings.type() == PER_FRAGMENT);
+    }
+    else {
+        CrossSectionUniforms::set();
+    }
+    CrossSectionUniforms::bind();
+
     bgfx::submit(viewId, mIdProgram);
 }
 
@@ -263,21 +290,24 @@ bgfx::ProgramHandle Lines::linesProgramSelector() const
     constexpr uint N_INDEX_MODES   = 2;
     constexpr uint N_TOPO_MODES    = 2;
     constexpr uint N_COLOR_MODES   = 3;
+    constexpr uint N_SECTION_MODES = 2;
 
     uint shading  = toUnderlying(mShading);
     uint indices  = mIndices.isValid() ? 0 : 1;
     uint topology = toUnderlying(mTopology);
     uint color    = toUnderlying(mColorSetting);
+    uint section  = mCrossSectionSettings.isEnabled() ? 1 : 0;
 
     // the first shader of all the combinations
     uint base = toUnderlying(
-        PRIMITIVE_LINES_SHADING_NONE_INDICES_ON_TOPO_LINES_COLOR_PER_VERTEX);
+        PRIMITIVE_LINES_SHADING_NONE_INDICES_ON_TOPO_LINES_COLOR_PER_VERTEX_SECTION_OFF);
 
     uint offset = linearizeIndex<
         N_SHADING_MODES,
         N_INDEX_MODES,
         N_TOPO_MODES,
-        N_COLOR_MODES>(shading, indices, topology, color);
+        N_COLOR_MODES,
+        N_SECTION_MODES>(shading, indices, topology, color, section);
 
     uint program = base + offset;
 
@@ -291,16 +321,18 @@ bgfx::ProgramHandle Lines::linesIdProgramSelector() const
 
     constexpr uint N_INDEX_MODES = 2;
     constexpr uint N_TOPO_MODES  = 2;
+    constexpr uint N_SECTION_MODES = 2;
 
     uint indices  = mIndices.isValid() ? 0 : 1;
     uint topology = toUnderlying(mTopology);
+    uint section  = mCrossSectionSettings.isEnabled() ? 1 : 0;
 
     // the first shader of all the combinations
     uint base = toUnderlying(
-        PRIMITIVE_LINES_ID_SHADING_NONE_INDICES_ON_TOPO_LINES_COLOR_GENERAL);
+        PRIMITIVE_LINES_ID_SHADING_NONE_INDICES_ON_TOPO_LINES_COLOR_GENERAL_SECTION_OFF);
 
     uint offset =
-        linearizeIndex<N_INDEX_MODES, N_TOPO_MODES>(indices, topology);
+        linearizeIndex<N_INDEX_MODES, N_TOPO_MODES, N_SECTION_MODES>(indices, topology, section);
 
     uint program = base + offset;
 

From f29e54820c7f209b3383609b345551e5e3d954d9 Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Tue, 4 Aug 2026 21:24:22 +0200
Subject: [PATCH 48/49] [tests] wireframe cross section test

---
 ...ame-headless_cross_section_fragment_gt.png | Bin 0 -> 32083 bytes
 ...frame-headless_cross_section_vertex_gt.png | Bin 0 -> 30291 bytes
 .../005-mesh-wireframe-headless/main.cpp      |  57 ++++++++++++++++++
 3 files changed, 57 insertions(+)
 create mode 100644 assets/ground_truth/005-mesh-wireframe-headless_cross_section_fragment_gt.png
 create mode 100644 assets/ground_truth/005-mesh-wireframe-headless_cross_section_vertex_gt.png

diff --git a/assets/ground_truth/005-mesh-wireframe-headless_cross_section_fragment_gt.png b/assets/ground_truth/005-mesh-wireframe-headless_cross_section_fragment_gt.png
new file mode 100644
index 0000000000000000000000000000000000000000..bd8899d12bda219780fe7d31d2c1548c8796463d
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/tests/render/005-mesh-wireframe-headless/main.cpp b/tests/render/005-mesh-wireframe-headless/main.cpp
index af292ba79c..4e43c1aa38 100644
--- a/tests/render/005-mesh-wireframe-headless/main.cpp
+++ b/tests/render/005-mesh-wireframe-headless/main.cpp
@@ -230,3 +230,60 @@ TEST_CASE("Wireframe Depth Offset")
         });
     }
 }
+
+TEST_CASE("Wireframe Cross Section")
+{
+    SECTION("Vertex Cross Section")
+    {
+        runRenderTest("cross_section_vertex", [](vcl::HeadlessMeshViewer& mv) {
+            auto mesh = getDrawableMesh<vcl::TriMesh>("bunny_simplified.obj");
+
+            auto settings = mesh.renderSettings();
+            settings.setSurface(vcl::MeshRenderInfo::Surface::VISIBLE, false);
+            settings.setWireframe(
+                vcl::MeshRenderInfo::Wireframe::VISIBLE, true);
+            settings.setWireframeWidth(3);
+            mesh.setRenderSettings(settings);
+
+            vcl::CrossSectionSettings css(mesh);
+            css.type() =
+                vcl::CrossSectionSettings::CrossSectionType::PER_VERTEX;
+
+            vcl::Point3f min = css.boundingBox().min();
+            vcl::Point3f max = css.boundingBox().max();
+            css.setLowerUpper(min + (max - min) * 0.25f,
+                              max - (max - min) * 0.25f);
+
+            mesh.setCrossSectionSettings(css);
+
+            mv.pushDrawableObject(std::move(mesh));
+        });
+    }
+
+    SECTION("Fragment Cross Section")
+    {
+        runRenderTest("cross_section_fragment", [](vcl::HeadlessMeshViewer& mv) {
+            auto mesh = getDrawableMesh<vcl::TriMesh>("bunny_simplified.obj");
+
+            auto settings = mesh.renderSettings();
+            settings.setSurface(vcl::MeshRenderInfo::Surface::VISIBLE, false);
+            settings.setWireframe(
+                vcl::MeshRenderInfo::Wireframe::VISIBLE, true);
+            settings.setWireframeWidth(3);
+            mesh.setRenderSettings(settings);
+
+            vcl::CrossSectionSettings css(mesh);
+            css.type() =
+                vcl::CrossSectionSettings::CrossSectionType::PER_FRAGMENT;
+
+            vcl::Point3f min = css.boundingBox().min();
+            vcl::Point3f max = css.boundingBox().max();
+            css.setLowerUpper(min + (max - min) * 0.25f,
+                              max - (max - min) * 0.25f);
+
+            mesh.setCrossSectionSettings(css);
+
+            mv.pushDrawableObject(std::move(mesh));
+        });
+    }
+}

From c95ce127d0d453f55833bba867ef958ad305954e Mon Sep 17 00:00:00 2001
From: alemuntoni <alemuntoni@users.noreply.github.com>
Date: Sun, 9 Aug 2026 12:40:36 +0200
Subject: [PATCH 49/49] [tests] fix build error

---
 .../005-mesh-wireframe-headless/main.cpp      | 88 +++++++++++--------
 1 file changed, 52 insertions(+), 36 deletions(-)

diff --git a/tests/render/005-mesh-wireframe-headless/main.cpp b/tests/render/005-mesh-wireframe-headless/main.cpp
index 816618d433..2a7b627117 100644
--- a/tests/render/005-mesh-wireframe-headless/main.cpp
+++ b/tests/render/005-mesh-wireframe-headless/main.cpp
@@ -219,55 +219,71 @@ TEST_CASE("Wireframe Cross Section")
 {
     SECTION("Vertex Cross Section")
     {
-        runRenderTest("cross_section_vertex", [](vcl::HeadlessMeshViewer& mv) {
-            auto mesh = getDrawableMesh<vcl::TriMesh>("bunny_simplified.obj");
+        runRenderTest(
+            TEST_NAME,
+            "cross_section_vertex",
+            [](vcl::HeadlessMeshViewer& mv) {
+                auto mesh =
+                    getDrawableMesh<vcl::TriMesh>("bunny_simplified.obj");
 
-            auto settings = mesh.renderSettings();
-            settings.setSurface(vcl::MeshRenderInfo::Surface::VISIBLE, false);
-            settings.setWireframe(
-                vcl::MeshRenderInfo::Wireframe::VISIBLE, true);
-            settings.setWireframeWidth(3);
-            mesh.setRenderSettings(settings);
+                auto settings = mesh.renderSettings();
+                settings.setSurface(
+                    vcl::MeshRenderInfo::Surface::VISIBLE, false);
+                settings.setWireframe(
+                    vcl::MeshRenderInfo::Wireframe::VISIBLE, true);
+                settings.setWireframeWidth(3);
+                mesh.setRenderSettings(settings);
 
-            vcl::CrossSectionSettings css(mesh);
-            css.type() =
-                vcl::CrossSectionSettings::CrossSectionType::PER_VERTEX;
+                vcl::CrossSectionSettings css(mesh);
+                css.type() =
+                    vcl::CrossSectionSettings::CrossSectionType::PER_VERTEX;
 
-            vcl::Point3f min = css.boundingBox().min();
-            vcl::Point3f max = css.boundingBox().max();
-            css.setLowerUpper(min + (max - min) * 0.25f,
-                              max - (max - min) * 0.25f);
+                vcl::Point3f min = css.boundingBox().min();
+                vcl::Point3f max = css.boundingBox().max();
+                css.setLowerUpper(
+                    min + (max - min) * 0.25f, max - (max - min) * 0.25f);
 
-            mesh.setCrossSectionSettings(css);
+                mesh.setCrossSectionSettings(css);
 
-            mv.pushDrawableObject(std::move(mesh));
-        });
+                mv.pushDrawableObject(std::move(mesh));
+            },
+            0.f,
+            false,
+            -150.f);
     }
 
     SECTION("Fragment Cross Section")
     {
-        runRenderTest("cross_section_fragment", [](vcl::HeadlessMeshViewer& mv) {
-            auto mesh = getDrawableMesh<vcl::TriMesh>("bunny_simplified.obj");
+        runRenderTest(
+            TEST_NAME,
+            "cross_section_fragment",
+            [](vcl::HeadlessMeshViewer& mv) {
+                auto mesh =
+                    getDrawableMesh<vcl::TriMesh>("bunny_simplified.obj");
 
-            auto settings = mesh.renderSettings();
-            settings.setSurface(vcl::MeshRenderInfo::Surface::VISIBLE, false);
-            settings.setWireframe(
-                vcl::MeshRenderInfo::Wireframe::VISIBLE, true);
-            settings.setWireframeWidth(3);
-            mesh.setRenderSettings(settings);
+                auto settings = mesh.renderSettings();
+                settings.setSurface(
+                    vcl::MeshRenderInfo::Surface::VISIBLE, false);
+                settings.setWireframe(
+                    vcl::MeshRenderInfo::Wireframe::VISIBLE, true);
+                settings.setWireframeWidth(3);
+                mesh.setRenderSettings(settings);
 
-            vcl::CrossSectionSettings css(mesh);
-            css.type() =
-                vcl::CrossSectionSettings::CrossSectionType::PER_FRAGMENT;
+                vcl::CrossSectionSettings css(mesh);
+                css.type() =
+                    vcl::CrossSectionSettings::CrossSectionType::PER_FRAGMENT;
 
-            vcl::Point3f min = css.boundingBox().min();
-            vcl::Point3f max = css.boundingBox().max();
-            css.setLowerUpper(min + (max - min) * 0.25f,
-                              max - (max - min) * 0.25f);
+                vcl::Point3f min = css.boundingBox().min();
+                vcl::Point3f max = css.boundingBox().max();
+                css.setLowerUpper(
+                    min + (max - min) * 0.25f, max - (max - min) * 0.25f);
 
-            mesh.setCrossSectionSettings(css);
+                mesh.setCrossSectionSettings(css);
 
-            mv.pushDrawableObject(std::move(mesh));
-        });
+                mv.pushDrawableObject(std::move(mesh));
+            },
+            0.f,
+            false,
+            -150.f);
     }
 }