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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 LICENCE BLOCK *****
bl_info = {
"name": "Custom Normals Tools",
"author": "Bastien Montagne (mont29)",
"version": (0, 0, 1),
"blender": (2, 75, 0),
"location": "3DView > Tools",
"description": "Various tools/helpers for custom normals",
"warning": "",
"support": 'OFFICIAL',
"category": "Mesh",
}
import bpy
class MESH_OT_flip_custom_normals(bpy.types.Operator):
"""Flip active mesh's normals, including custom ones (only in Object mode)"""
bl_idname = "mesh.flip_custom_normals"
bl_label = "Flip Custom Normals"
bl_options = {'UNDO'}
@classmethod
def poll(cls, context):
return context.object and context.object.type == 'MESH' and context.object.mode == 'OBJECT'
def execute(self, context):
me = context.object.data
if me.has_custom_normals:
me.calc_normals_split()
clnors = [0.0] * 3 * len(me.loops)
me.loops.foreach_get("normal", clnors)
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.mesh.flip_normals()
bpy.ops.object.mode_set(mode='OBJECT')
me = context.object.data
if me.has_custom_normals:
clnors[:] = list(zip(*[(-n for n in clnors)] * 3))
# We also have to take in account that the winding was reverted...
for p in me.polygons:
ls = p.loop_start + 1
le = ls + p.loop_total - 1
clnors[ls:le] = reversed(clnors[ls:le])
me.normals_split_custom_set(clnors)
context.scene.update()
return {'FINISHED'}
def flip_custom_normals_draw_func(self, context):
if isinstance(self, bpy.types.Panel):
self.layout.label("Custom Normal Tools:")
self.layout.operator(MESH_OT_flip_custom_normals.bl_idname)
def register():
bpy.utils.register_module(__name__)
bpy.types.VIEW3D_PT_tools_object.append(flip_custom_normals_draw_func)
def unregister():
bpy.types.VIEW3D_PT_tools_object.remove(flip_custom_normals_draw_func)
bpy.utils.unregister_module(__name__)
if __name__ == "__main__":
register()