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# ##### BEGIN GPL LICENSE BLOCK #####
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####
# <pep8 compliant>
def mesh_linked_faces(mesh):
'''
Splits the mesh into connected parts,
these parts are returned as lists of faces.
used for seperating cubes from other mesh elements in the 1 mesh
'''
# Build vert face connectivity
vert_faces = [[] for i in range(len(mesh.vertices))]
for f in mesh.faces:
for v in f.vertices:
vert_faces[v].append(f)
# sort faces into connectivity groups
face_groups = [[f] for f in mesh.faces]
face_mapping = list(range(len(mesh.faces))) # map old, new face location
# Now clump faces iterativly
ok = True
while ok:
ok = False
for i, f in enumerate(mesh.faces):
mapped_index = face_mapping[f.index]
mapped_group = face_groups[mapped_index]
for v in f.vertices:
for nxt_f in vert_faces[v]:
if nxt_f != f:
nxt_mapped_index = face_mapping[nxt_f.index]
# We are not a part of the same group
if mapped_index != nxt_mapped_index:
ok = True
# Assign mapping to this group so they all map to this group
for grp_f in face_groups[nxt_mapped_index]:
face_mapping[grp_f.index] = mapped_index
# Move faces into this group
mapped_group.extend(face_groups[nxt_mapped_index])
# remove reference to the list
face_groups[nxt_mapped_index] = None
# return all face groups that are not null
# this is all the faces that are connected in their own lists.
return [fg for fg in face_groups if fg]
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