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author | Campbell Barton <ideasman42@gmail.com> | 2012-06-25 11:24:01 +0400 |
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committer | Campbell Barton <ideasman42@gmail.com> | 2012-06-25 11:24:01 +0400 |
commit | f6337a2843b2686fea49df60562c28ed7490ebcd (patch) | |
tree | 9241934b2cfc49eea9ec08e2e707f2ba006a7e6d /release/scripts/modules/bpy_extras/mesh_utils.py | |
parent | 49e0175e4018930c906cca1eda14c10cbf71bd24 (diff) |
utility mesh function to return UV islands
Diffstat (limited to 'release/scripts/modules/bpy_extras/mesh_utils.py')
-rw-r--r-- | release/scripts/modules/bpy_extras/mesh_utils.py | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/release/scripts/modules/bpy_extras/mesh_utils.py b/release/scripts/modules/bpy_extras/mesh_utils.py index fa83b1861d2..efd69f91a8b 100644 --- a/release/scripts/modules/bpy_extras/mesh_utils.py +++ b/release/scripts/modules/bpy_extras/mesh_utils.py @@ -19,6 +19,7 @@ # <pep8-80 compliant> __all__ = ( + "mesh_linked_uv_islands", "mesh_linked_tessfaces", "edge_face_count_dict", "edge_face_count", @@ -29,6 +30,66 @@ __all__ = ( ) +def mesh_linked_uv_islands(mesh): + """ + Splits the mesh into connected polygons, use this for seperating cubes from + other mesh elements within 1 mesh datablock. + + :arg mesh: the mesh used to group with. + :type mesh: :class:`bpy.types.Mesh` + :return: lists of lists containing polygon indices + :rtype: list + """ + uv_loops = [luv.uv[:] for luv in mesh.uv_layers.active.data] + poly_loops = [poly.loop_indices for poly in mesh.polygons] + luv_hash = {} + luv_hash_get = luv_hash.get + luv_hash_ls = [None] * len(uv_loops) + for pi, poly_indices in enumerate(poly_loops): + for li in poly_indices: + uv = uv_loops[li] + uv_hub = luv_hash_get(uv) + if uv_hub is None: + uv_hub = luv_hash[uv] = [pi] + else: + uv_hub.append(pi) + luv_hash_ls[li] = uv_hub + + poly_islands = [] + + # 0 = none, 1 = added, 2 = searched + poly_tag = [0] * len(poly_loops) + + while True: + poly_index = -1 + for i in range(len(poly_loops)): + if poly_tag[i] == 0: + poly_index = i + break + + if poly_index != -1: + island = [poly_index] + poly_tag[poly_index] = 1 + poly_islands.append(island) + else: + break # we're done + + added = True + while added: + added = False + for poly_index in island[:]: + if poly_tag[poly_index] == 1: + for li in poly_loops[poly_index]: + for poly_index_shared in luv_hash_ls[li]: + if poly_tag[poly_index_shared] == 0: + added = True + poly_tag[poly_index_shared] = 1 + island.append(poly_index_shared) + poly_tag[poly_index] = 2 + + return poly_islands + + def mesh_linked_tessfaces(mesh): """ Splits the mesh into connected faces, use this for seperating cubes from |