Issues

• IfcImporter: a model without meshes (e.g. grids only) records zero coordinates, so its grids load off by the coordination shift

  ThatOpen/engine_fragment#356 · Filter by author elyrank opened on Nov 10, 2026

• IfcImporter rounds a transform's x direction to 3 decimals while y and position keep 5, so rotated elements drift ~0.5 mm/m

  ThatOpen/engine_fragment#355 · Filter by author elyrank opened on Nov 10, 2026

• Fragments: "Malformed tile!" unhandled rejection when update() runs while VirtualTilesController.generate() is still building tiles

  ThatOpen/engine_fragment#352 · Filter by author JoseARVargas opened on Nov 6, 2026

• geometry rendering difference involving curved surfaces in a FRAG model.

  bug
  ThatOpen/engine_fragment#351 · Filter by author migfrazao2003 opened on Nov 5, 2026
  1

• 3.5.0+ cannot be bundled against the WebGL build of three (Next.js / Turbopack + webpack): WebGPU-only symbols read as static members of the three namespace

  bug
  ThatOpen/engine_fragment#350 · Filter by author TristanLecallierABIME opened on Nov 3, 2026

• Materials beyond RGBA: specular/roughness and textures (IfcSurfaceStyleRendering, IfcSurfaceStyleWithTextures)

  feature
  ThatOpen/engine_fragment#349 · Filter by author cmartif opened on Nov 2, 2026

• getSection leaves the contour of a closed mesh open (vertex on the plane, ends split by the 0.1 mm grid)

  bug
  ThatOpen/engine_fragment#347 · Filter by author cmartif opened on Oct 28, 2026

• createElements returns the wrong elements when deletions are queued in the same batch

  bug
  ThatOpen/engine_fragment#346 · Filter by author cmartif opened on Oct 28, 2026

• getItemsGeometry returns one entry per item with geometry, not one per requested ID

  bug
  ThatOpen/engine_fragment#345 · Filter by author cmartif opened on Oct 28, 2026

• Reclaimed highlight ids are reissued for a different definition while _samples still holds the old ones, so hasHighlightChanged goes blind

  ThatOpen/engine_fragment#344 · Filter by author puraifc-cpu opened on Oct 28, 2026

• models.list.onItemSet fires before the worker knows the model, so model calls from it fail with "Model not found"

  ThatOpen/engine_fragment#343 · Filter by author Chaosnico9000 opened on Oct 23, 2026

• Importer parses each IFC twice: opt-in parseOnce to reuse the geometry step's model

  ThatOpen/engine_fragment#342 · Filter by author NikolayBorissovASTRA opened on Oct 18, 2026

• Clipping opacity

  feature
  ThatOpen/engine_fragment#340 · Filter by author ShaMan123 opened on Oct 14, 2026

• FEAT: handing control over update cycle to consumer

  ThatOpen/engine_fragment#339 · Filter by author ShaMan123 opened on Oct 13, 2026

• Upgrade stale frag on load

  feature
  ThatOpen/engine_fragment#316 · Filter by author ShaMan123 opened on Oct 10, 2026
  2

• Performance issues loading very large IFC files (~2 GB)

  ThatOpen/engine_fragment#315 · Filter by author Leonidasuzcategui opened on Oct 7, 2026
  1

• TS bundle: internal vs. public methods

  feature
  ThatOpen/engine_fragment#312 · Filter by author ShaMan123 opened on Sep 29, 2026

• Replacing web-ifc's tape reader with stream parser

  ThatOpen/engine_fragment#310 · Filter by author ShaMan123 opened on Sep 26, 2026
  2

• Outliner loses the outline of items whose tiles are not realized

  ThatOpen/engine_fragment#303 · Filter by author ShaMan123 opened on Sep 13, 2026
  3

• IfcSpace “Roof” rendered as visible geometry in That Open BIM App, unlike Dalux and BIMvision

  bug
  ThatOpen/engine_fragment#301 · Filter by author cubalibre opened on Sep 12, 2026

• Proposal: a native SkpImporter (SketchUp → Fragments), parallel to IfcImporter

  ThatOpen/engine_fragment#296 · Filter by author iamahsanmehmood opened on Sep 10, 2026
  2

• IfcParserStream ref resolution

  feature
  ThatOpen/engine_fragment#293 · Filter by author ShaMan123 opened on Sep 10, 2026

• Unexpected selection grouping when loading an IFC in the your official BIM App template

  bug
  ThatOpen/engine_fragment#274 · Filter by author cubalibre opened on Sep 1, 2026
  2

• LOD (WIRES) box outlines can remain visible for items hidden via setVisible under heavy update traffic

  ThatOpen/engine_fragment#265 · Filter by author stokuewe opened on Aug 10, 2026
  1

• IfcImporter.process(): observed nondeterministic geometry-to-item assignment across repeated runs on the same input

  ThatOpen/engine_fragment#260 · Filter by author Amontilladow opened on Aug 2, 2026
  2