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# Copyright 2018-2019 The glTF-Blender-IO authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import bpy
import bmesh
from mathutils import Vector
from ..com.gltf2_blender_extras import set_extras
from .gltf2_blender_material import BlenderMaterial
from .gltf2_blender_primitive import BlenderPrimitive
from ...io.imp.gltf2_io_binary import BinaryData
class BlenderMesh():
"""Blender Mesh."""
def __new__(cls, *args, **kwargs):
raise RuntimeError("%s should not be instantiated" % cls)
@staticmethod
def create(gltf, mesh_idx, skin_idx):
"""Mesh creation."""
pymesh = gltf.data.meshes[mesh_idx]
# Create one bmesh, add all primitives to it, and then convert it to a
# mesh.
bme = bmesh.new()
# List of all the materials this mesh will use. The material each
# primitive uses is set by giving an index into this list.
materials = []
# Process all primitives
for prim in pymesh.primitives:
if prim.material is None:
material_idx = None
else:
pymaterial = gltf.data.materials[prim.material]
vertex_color = None
if 'COLOR_0' in prim.attributes:
vertex_color = 'COLOR_0'
# Create Blender material if needed
if vertex_color not in pymaterial.blender_material:
BlenderMaterial.create(gltf, prim.material, vertex_color)
material_name = pymaterial.blender_material[vertex_color]
material = bpy.data.materials[material_name]
try:
material_idx = materials.index(material.name)
except ValueError:
materials.append(material.name)
material_idx = len(materials) - 1
BlenderPrimitive.add_primitive_to_bmesh(gltf, bme, pymesh, prim, skin_idx, material_idx)
name = pymesh.name or 'Mesh_' + str(mesh_idx)
mesh = bpy.data.meshes.new(name)
BlenderMesh.bmesh_to_mesh(gltf, pymesh, bme, mesh)
bme.free()
for name_material in materials:
mesh.materials.append(bpy.data.materials[name_material])
mesh.update()
set_extras(mesh, pymesh.extras, exclude=['targetNames'])
# Clear accessor cache after all primitives are done
gltf.accessor_cache = {}
return mesh
@staticmethod
def bmesh_to_mesh(gltf, pymesh, bme, mesh):
bme.to_mesh(mesh)
# Unfortunately need to do shapekeys/normals/smoothing ourselves.
# Shapekeys
if len(bme.verts.layers.shape) != 0:
# The only way I could find to create a shape key was to temporarily
# parent mesh to an object and use obj.shape_key_add.
tmp_ob = None
try:
tmp_ob = bpy.data.objects.new('##gltf-import:tmp-object##', mesh)
tmp_ob.shape_key_add(name='Basis')
mesh.shape_keys.name = mesh.name
for layer_name in bme.verts.layers.shape.keys():
tmp_ob.shape_key_add(name=layer_name)
key_block = mesh.shape_keys.key_blocks[layer_name]
layer = bme.verts.layers.shape[layer_name]
for i, v in enumerate(bme.verts):
key_block.data[i].co = v[layer]
finally:
if tmp_ob:
bpy.data.objects.remove(tmp_ob)
# Normals
mesh.update()
if gltf.import_settings['import_shading'] == "NORMALS":
mesh.create_normals_split()
use_smooths = [] # whether to smooth for each poly
face_idx = 0
for prim in pymesh.primitives:
if gltf.import_settings['import_shading'] == "FLAT" or \
'NORMAL' not in prim.attributes:
use_smooths += [False] * prim.num_faces
elif gltf.import_settings['import_shading'] == "SMOOTH":
use_smooths += [True] * prim.num_faces
elif gltf.import_settings['import_shading'] == "NORMALS":
mesh_loops = mesh.loops
for fi in range(face_idx, face_idx + prim.num_faces):
poly = mesh.polygons[fi]
# "Flat normals" are when all the vertices in poly have the
# poly's normal. Otherwise, smooth the poly.
for loop_idx in range(poly.loop_start, poly.loop_start + poly.loop_total):
vi = mesh_loops[loop_idx].vertex_index
if poly.normal.dot(bme.verts[vi].normal) <= 0.9999999:
use_smooths.append(True)
break
else:
use_smooths.append(False)
else:
# shouldn't happen
assert False
face_idx += prim.num_faces
mesh.polygons.foreach_set('use_smooth', use_smooths)
# Custom normals, now that every update is done
if gltf.import_settings['import_shading'] == "NORMALS":
custom_normals = [v.normal for v in bme.verts]
mesh.normals_split_custom_set_from_vertices(custom_normals)
mesh.use_auto_smooth = True
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