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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>
import bpy
import array
from itertools import chain
def create_and_link_mesh(name, faces, face_nors, points, global_matrix):
"""
Create a blender mesh and object called name from a list of
*points* and *faces* and link it in the current scene.
"""
mesh = bpy.data.meshes.new(name)
mesh.from_pydata(points, [], faces)
if face_nors:
# Note: we store 'temp' normals in loops, since validate() may alter final mesh,
# we can only set custom lnors *after* calling it.
mesh.create_normals_split()
lnors = tuple(chain(*chain(*zip(face_nors, face_nors, face_nors))))
mesh.loops.foreach_set("normal", lnors)
mesh.transform(global_matrix)
# update mesh to allow proper display
mesh.validate(clean_customdata=False) # *Very* important to not remove lnors here!
if face_nors:
clnors = array.array('f', [0.0] * (len(mesh.loops) * 3))
mesh.loops.foreach_get("normal", clnors)
mesh.polygons.foreach_set("use_smooth", [True] * len(mesh.polygons))
mesh.normals_split_custom_set(tuple(zip(*(iter(clnors),) * 3)))
mesh.use_auto_smooth = True
mesh.show_edge_sharp = True
mesh.free_normals_split()
mesh.update()
scene = bpy.context.scene
obj = bpy.data.objects.new(name, mesh)
scene.objects.link(obj)
scene.objects.active = obj
obj.select = True
def faces_from_mesh(ob, global_matrix, use_mesh_modifiers=False, triangulate=True):
"""
From an object, return a generator over a list of faces.
Each faces is a list of his vertexes. Each vertex is a tuple of
his coordinate.
use_mesh_modifiers
Apply the preview modifier to the returned liste
triangulate
Split the quad into two triangles
"""
# get the editmode data
ob.update_from_editmode()
# get the modifiers
try:
mesh = ob.to_mesh(bpy.context.scene, use_mesh_modifiers, "PREVIEW")
except RuntimeError:
raise StopIteration
mesh.transform(global_matrix * ob.matrix_world)
if triangulate:
# From a list of faces, return the face triangulated if needed.
def iter_face_index():
for face in mesh.tessfaces:
vertices = face.vertices[:]
if len(vertices) == 4:
yield vertices[0], vertices[1], vertices[2]
yield vertices[2], vertices[3], vertices[0]
else:
yield vertices
else:
def iter_face_index():
for face in mesh.tessfaces:
yield face.vertices[:]
vertices = mesh.vertices
for indexes in iter_face_index():
yield [vertices[index].co.copy() for index in indexes]
bpy.data.meshes.remove(mesh)
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