e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
59 lines
1.6 KiB
Python
59 lines
1.6 KiB
Python
# SPDX-FileCopyrightText: 2022-2023 Blender Authors
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#
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# SPDX-License-Identifier: GPL-2.0-or-later
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__all__ = (
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"bmesh_linked_uv_islands",
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)
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import bmesh
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def match_uv(face, vert, uv, uv_layer):
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for loop in face.loops:
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if loop.vert == vert:
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return uv == loop[uv_layer].uv
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return False
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def bmesh_linked_uv_islands(bm, uv_layer):
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"""
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Returns lists of faces connected by UV islands.
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For meshes use :class:`bpy.types.Mesh.mesh_linked_uv_islands` instead.
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:arg bm: the bmesh used to group with.
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:type bmesh: :class:`BMesh`
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:arg uv_layer: the UV layer to source UVs from.
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:type bmesh: :class:`BMLayerItem`
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:return: list of lists containing polygon indices
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:rtype: list
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"""
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result = []
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used = set()
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for seed_face in bm.faces:
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if seed_face in used:
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continue # Face has already been processed.
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used.add(seed_face)
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island = [seed_face]
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stack = [seed_face] # Faces still to consider on this island.
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while stack:
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current_face = stack.pop()
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for loop in current_face.loops:
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v = loop.vert
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uv = loop[uv_layer].uv
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for f in v.link_faces:
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if f is current_face or f in used:
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continue
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if not match_uv(f, v, uv, uv_layer):
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continue
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# `f` is part of island, add to island and stack
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used.add(f)
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island.append(f)
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stack.append(f)
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result.append(island)
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return result
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