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Fixed double mirroring when two IfcPolygonalFaceSets reuse the same coordinate list entity

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This commit is contained in:
Robin Quint
2025-08-22 18:14:47 +02:00
committed by Ryan Schultz
parent f1754ca523
commit dcb22acd3c
1 changed files with 5 additions and 0 deletions
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src/ifcopenshell-python/ifcopenshell/util/shape_builder.py
+5
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@@ -1011,6 +1011,11 @@ class ShapeBuilder:
self.mirror(c.BasisCurve, mirror_axes, mirror_point)
elif c.is_a("IfcPolygonalFaceSet"):
if c.file.get_total_inverses(c.Coordinates) > 1:
# if Coordinates is used more than once, this probably means that another representation item
# is referencing the same coordinate list. To not disturb this other item, clone the coordinates
new_coords_elem = ifcopenshell.util.element.copy(c.file, c.Coordinates)
c.Coordinates = new_coords_elem
new_coords = []
for coord in c.Coordinates.CoordList:
new_coord_2d = self.mirror_2d_point([coord[0], coord[1]], mirror_axes, mirror_point)