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Fix #6174. Accommodate invalid index maps, and also implement an early return for single colours.

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A single colour index map is a waste but some IFCs have it apparently.
This commit is contained in:
Dion Moult
2025-02-18 18:39:22 +11:00
parent c79020aeab
commit 1e3ddce5c2
1 changed files with 33 additions and 24 deletions
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src/bonsai/bonsai/tool/loader.py
+33 -24
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@@ -592,33 +592,42 @@ class Loader(bonsai.core.tool.Loader):
opacity = opacity if opacity is not None else 1.0
data_list = [d + (opacity,) for d in data_list]
faces_tex_coord_data = {}
for tex_coord_index, face_remap in zip(texture_map, faces_remap, strict=True):
faces_tex_coord_data[tuple(face_remap)] = (tex_coord_index, face_remap)
if index_map.is_a("IfcIndexedColourMap") and len(index_map.Colours.ColourList) == 1:
# Early return scenario in case there is only one colour
data_colour = data_list[0]
for bface in bm.faces:
for loop in bface.loops:
loop[layer] = data_colour
elif len(texture_map) != len(faces_remap):
print(f"Warning: invalid index map found: {index_map}")
else:
faces_tex_coord_data = {}
for tex_coord_index, face_remap in zip(texture_map, faces_remap, strict=True):
faces_tex_coord_data[tuple(face_remap)] = (tex_coord_index, face_remap)
# Apply attribute to each face
for bface in bm.faces:
face = tuple(loop.vert.index for loop in bface.loops)
# Find the corresponding index in data list by matching ifc faceset with blender face.
data_index = None
if tex_coord_data := faces_tex_coord_data.get(face):
tex_coord_index, face_remap = tex_coord_data
# Subtract 1 as tex_coord_index starts with 1.
if map_type == "UV":
data_index = [tex_coord_index[face_remap.index(i)] - 1 for i in face]
# Apply attribute to each face
for bface in bm.faces:
face = tuple(loop.vert.index for loop in bface.loops)
# Find the corresponding index in data list by matching ifc faceset with blender face.
data_index = None
if tex_coord_data := faces_tex_coord_data.get(face):
tex_coord_index, face_remap = tex_coord_data
# Subtract 1 as tex_coord_index starts with 1.
if map_type == "UV":
data_index = [tex_coord_index[face_remap.index(i)] - 1 for i in face]
else:
data_index = [tex_coord_index - 1 for i in face]
else:
data_index = [tex_coord_index - 1 for i in face]
else:
# This face may be part of another representation item
# Or we couldn't match it due to georeferencing.
continue
# This face may be part of another representation item
# Or we couldn't match it due to georeferencing.
continue
# apply uv to each loop
for loop, i in zip(bface.loops, data_index):
if map_type == "UV":
loop[layer].uv = data_list[i]
else:
loop[layer] = data_list[i]
# apply uv to each loop
for loop, i in zip(bface.loops, data_index):
if map_type == "UV":
loop[layer].uv = data_list[i]
else:
loop[layer] = data_list[i]
# Finish up, write the bmesh back to the mesh
bm.to_mesh(mesh)