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ShapeBuilder: added support for IndexedPolygonalFaceWithVoids, fixed winding order when mirroring on an even number of axes

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This commit is contained in:
Robin Quint
2025-08-08 14:54:24 +02:00
committed by Ryan Schultz
parent 21d1d014e3
commit adac547222
1 changed files with 19 additions and 6 deletions
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src/ifcopenshell-python/ifcopenshell/util/shape_builder.py
+19 -6
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@@ -927,6 +927,8 @@ class ShapeBuilder:
processed_objects: list[ifcopenshell.entity_instance] = []
for curve_or_item_el in curve_or_item:
for mirror_axes in mirror_axes_data:
axis_flip_count = sum([a > 0.0 for a in mirror_axes])
c = (
ifcopenshell.util.element.copy_deep(self.file, curve_or_item_el)
if create_copy
@@ -1015,12 +1017,23 @@ class ShapeBuilder:
new_coords.append([float(new_coord_2d[0]), float(new_coord_2d[1]), float(coord[2])])
c.Coordinates.CoordList = new_coords
for face in c.Faces:
new_indices = []
for index in face.CoordIndex:
new_indices.append(int(index))
new_indices.reverse()
face.CoordIndex = new_indices
if (axis_flip_count % 2) != 0:
for face in c.Faces:
new_indices = []
for index in face.CoordIndex:
new_indices.append(int(index))
new_indices.reverse()
face.CoordIndex = new_indices
if face.is_a("IfcIndexedPolygonalFaceWithVoids"):
new_inner_indices = []
for inner_loop in face.InnerCoordIndices:
new_indices = []
for index in inner_loop:
new_indices.append(index)
new_indices.reverse()
new_inner_indices.append(new_indices)
face.InnerCoordIndices = new_inner_indices
elif c.is_a("IfcGeometricSet"):
self.mirror(c.Elements, mirror_axes, mirror_point)
else: