mirror of
https://github.com/blender/blender-addons.git
synced 2025-08-20 13:22:58 +00:00
0f2f0e4951
Using new `mesh.flip_normals()` when the mesh is transformed with a negative matrix (mirror along one axis e.g.).
118 lines
3.6 KiB
Python
118 lines
3.6 KiB
Python
# ##### 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
|
|
|
|
mat = global_matrix * ob.matrix_world
|
|
mesh.transform(mat)
|
|
if mat.is_negative:
|
|
mesh.flip_normals()
|
|
mesh.calc_tessface()
|
|
|
|
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)
|