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Draft: support vtk files generated from Gmsh #1547

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Draft: support vtk files generated from Gmsh #1547

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8c42f16
Check for and skip extra header line from Gmsh in vtk files
GenevieveBuckley Nov 12, 2025
192fcee
Another difference in Gmsh vtk files
GenevieveBuckley Nov 12, 2025
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5 changes: 4 additions & 1 deletion src/meshio/vtk/_vtk_42.py
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,9 @@ def read_buffer(f):
f.readline()

data_type = f.readline().decode().strip().upper()
if "Created by Gmsh" in data_type:
# Gmesh vtk files have one extra header line to skip before data_type
data_type = f.readline().decode().strip().upper()
if data_type not in ["ASCII", "BINARY"]:
raise ReadError(f"Unknown VTK data type '{data_type}'.")
info.is_ascii = data_type == "ASCII"
Expand Down Expand Up @@ -430,7 +433,7 @@ def _read_scalar_field(f, num_data, split, is_ascii):
dtype = dtype.newbyteorder(">")
data = np.fromfile(f, count=num_data * num_comp, dtype=dtype)
line = f.readline().decode()
if line != "\n":
if line not in ["\n", ""]: # special case: Gmsh vtk files use "" not "\n"
raise ReadError()

data = data.reshape(-1, num_comp)
Expand Down
5 changes: 4 additions & 1 deletion src/meshio/vtk/_vtk_51.py
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,9 @@ def read_buffer(f):
f.readline()

data_type = f.readline().decode().strip().upper()
if "Created by Gmsh" in data_type:
# Gmesh vtk files have one extra header line to skip before data_type
data_type = f.readline().decode().strip().upper()
if data_type not in ["ASCII", "BINARY"]:
raise ReadError(f"Unknown VTK data type '{data_type}'.")
info.is_ascii = data_type == "ASCII"
Expand Down Expand Up @@ -402,7 +405,7 @@ def _read_scalar_field(f, num_data, split, is_ascii):
dtype = dtype.newbyteorder(">")
data = np.fromfile(f, count=num_data * num_comp, dtype=dtype)
line = f.readline().decode()
if line != "\n":
if line not in ["\n", ""]: # special case: Gmsh vtk files use "" not "\n"
raise ReadError()

data = data.reshape(-1, num_comp)
Expand Down