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fix issue getting styles if object had empty mat slots

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Occurred only with only_assigned_to_faces = True
A bit related to #4675

Error was
    styles = [style for style, usage in zip(styles, usage_count, strict=True) if usage > 0]

ValueError: zip() argument 2 is longer than argument 1
This commit is contained in:
Andrej730
2024-05-16 17:27:03 +05:00
parent d001180082
commit eaa80ad08a
1 changed files with 7 additions and 0 deletions
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src/blenderbim/blenderbim/tool/geometry.py
+7
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@@ -470,8 +470,15 @@ class Geometry(blenderbim.core.tool.Geometry):
usage_count = [0] * len(obj.material_slots) usage_count = [0] * len(obj.material_slots)
if not usage_count: # if there are no materials, polygons will still use index 0 if not usage_count: # if there are no materials, polygons will still use index 0
return [] return []
for poly in obj.data.polygons: for poly in obj.data.polygons:
usage_count[poly.material_index] += 1 usage_count[poly.material_index] += 1
# remove usages for empty material slots
for i, slot in reversed(list(enumerate(obj.material_slots))):
if not slot.material:
del usage_count[i]
styles = [style for style, usage in zip(styles, usage_count, strict=True) if usage > 0] styles = [style for style, usage in zip(styles, usage_count, strict=True) if usage > 0]
return styles return styles