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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
from mathutils import Vector
from .gltf2_blender_material import BlenderMaterial
from ..com.gltf2_blender_conversion import loc_gltf_to_blender
from ...io.imp.gltf2_io_binary import BinaryData
class BlenderPrimitive():
"""Blender Primitive."""
def __new__(cls, *args, **kwargs):
raise RuntimeError("%s should not be instantiated" % cls)
@staticmethod
def create(gltf, pyprimitive, verts, edges, faces):
"""Primitive creation."""
pyprimitive.blender_texcoord = {}
current_length = len(verts)
pos = BinaryData.get_data_from_accessor(gltf, pyprimitive.attributes['POSITION'])
if pyprimitive.indices is not None:
indices = BinaryData.get_data_from_accessor(gltf, pyprimitive.indices)
else:
indices = [(i,) for i in range(len(pos))]
pyprimitive.tmp_indices = indices
# Manage only vertices that are in indices tab
indice_equivalents = {}
new_pos = []
new_pos_idx = 0
for i in indices:
if i[0] not in indice_equivalents.keys():
indice_equivalents[i[0]] = new_pos_idx
new_pos.append(pos[i[0]])
new_pos_idx += 1
prim_verts = [loc_gltf_to_blender(vert) for vert in new_pos]
mode = 4 if pyprimitive.mode is None else pyprimitive.mode
prim_edges, prim_faces = BlenderPrimitive.edges_and_faces(mode, indices)
verts.extend(prim_verts)
pyprimitive.vertices_length = len(prim_verts)
edges.extend(
tuple(indice_equivalents[y] + current_length for y in e)
for e in prim_edges
)
faces.extend(
tuple(indice_equivalents[y] + current_length for y in f)
for f in prim_faces
)
# manage material of primitive
if pyprimitive.material is not None:
vertex_color = None
if 'COLOR_0' in pyprimitive.attributes.keys():
vertex_color = 'COLOR_0'
# Create Blender material if needed
if vertex_color is None:
if None not in gltf.data.materials[pyprimitive.material].blender_material.keys():
BlenderMaterial.create(gltf, pyprimitive.material, vertex_color)
else:
if vertex_color not in gltf.data.materials[pyprimitive.material].blender_material.keys():
BlenderMaterial.create(gltf, pyprimitive.material, vertex_color)
return verts, edges, faces
@staticmethod
def edges_and_faces(mode, indices):
"""Converts the indices in a particular primitive mode into standard lists of
edges (pairs of indices) and faces (tuples of CCW indices).
"""
es = []
fs = []
if mode == 0:
# POINTS
pass
elif mode == 1:
# LINES
# 1 3
# / /
# 0 2
es = [
(indices[i][0], indices[i + 1][0])
for i in range(0, len(indices), 2)
]
elif mode == 2:
# LINE LOOP
# 1---2
# / \
# 0-------3
es = [
(indices[i][0], indices[i + 1][0])
for i in range(0, len(indices) - 1)
]
es.append((indices[-1][0], indices[0][0]))
elif mode == 3:
# LINE STRIP
# 1---2
# / \
# 0 3
es = [
(indices[i][0], indices[i + 1][0])
for i in range(0, len(indices) - 1)
]
elif mode == 4:
# TRIANGLES
# 2 3
# / \ / \
# 0---1 4---5
fs = [
(indices[i][0], indices[i + 1][0], indices[i + 2][0])
for i in range(0, len(indices), 3)
]
elif mode == 5:
# TRIANGLE STRIP
# 0---2---4
# \ / \ /
# 1---3
def alternate(i, xs):
even = i % 2 == 0
return xs if even else (xs[0], xs[2], xs[1])
fs = [
alternate(i, (indices[i][0], indices[i + 1][0], indices[i + 2][0]))
for i in range(0, len(indices) - 2)
]
elif mode == 6:
# TRIANGLE FAN
# 3---2
# / \ / \
# 4---0---1
fs = [
(indices[0][0], indices[i][0], indices[i + 1][0])
for i in range(1, len(indices) - 1)
]
else:
raise Exception('primitive mode unimplemented: %d' % mode)
return es, fs
def set_normals(gltf, pyprimitive, mesh, offset, custom_normals):
"""Set Normal."""
if 'NORMAL' in pyprimitive.attributes.keys():
original_normal_data = BinaryData.get_data_from_accessor(gltf, pyprimitive.attributes['NORMAL'])
tmp_indices = {}
tmp_idx = 0
normal_data = []
for i in pyprimitive.tmp_indices:
if i[0] not in tmp_indices.keys():
tmp_indices[i[0]] = tmp_idx
tmp_idx += 1
normal_data.append(original_normal_data[i[0]])
for poly in mesh.polygons:
if gltf.import_settings['import_shading'] == "NORMALS":
calc_norm_vertices = []
for loop_idx in range(poly.loop_start, poly.loop_start + poly.loop_total):
vert_idx = mesh.loops[loop_idx].vertex_index
if vert_idx in range(offset, offset + pyprimitive.vertices_length):
cpt_vert = vert_idx - offset
mesh.vertices[vert_idx].normal = normal_data[cpt_vert]
custom_normals[vert_idx] = list(normal_data[cpt_vert])
calc_norm_vertices.append(vert_idx)
if len(calc_norm_vertices) == 3:
# Calcul normal
vert0 = mesh.vertices[calc_norm_vertices[0]].co
vert1 = mesh.vertices[calc_norm_vertices[1]].co
vert2 = mesh.vertices[calc_norm_vertices[2]].co
calc_normal = (vert1 - vert0).cross(vert2 - vert0).normalized()
# Compare normal to vertex normal
for i in calc_norm_vertices:
cpt_vert = vert_idx - offset
vec = Vector(
(normal_data[cpt_vert][0], normal_data[cpt_vert][1], normal_data[cpt_vert][2])
)
if not calc_normal.dot(vec) > 0.9999999:
poly.use_smooth = True
break
elif gltf.import_settings['import_shading'] == "FLAT":
poly.use_smooth = False
elif gltf.import_settings['import_shading'] == "SMOOTH":
poly.use_smooth = True
else:
pass # Should not happen
offset = offset + pyprimitive.vertices_length
return offset
def set_UV(gltf, pyprimitive, obj, mesh, offset):
"""Set UV Map."""
for texcoord in [attr for attr in pyprimitive.attributes.keys() if attr[:9] == "TEXCOORD_"]:
if texcoord not in mesh.uv_layers:
mesh.uv_layers.new(name=texcoord)
pyprimitive.blender_texcoord[int(texcoord[9:])] = texcoord
original_texcoord_data = BinaryData.get_data_from_accessor(gltf, pyprimitive.attributes[texcoord])
tmp_indices = {}
tmp_idx = 0
texcoord_data = []
for i in pyprimitive.tmp_indices:
if i[0] not in tmp_indices.keys():
tmp_indices[i[0]] = tmp_idx
tmp_idx += 1
texcoord_data.append(original_texcoord_data[i[0]])
for poly in mesh.polygons:
for loop_idx in range(poly.loop_start, poly.loop_start + poly.loop_total):
vert_idx = mesh.loops[loop_idx].vertex_index
if vert_idx in range(offset, offset + pyprimitive.vertices_length):
obj.data.uv_layers[texcoord].data[loop_idx].uv = \
Vector((texcoord_data[vert_idx - offset][0], 1 - texcoord_data[vert_idx - offset][1]))
offset = offset + pyprimitive.vertices_length
return offset
def set_UV_in_mat(gltf, pyprimitive, obj, vertex_color):
"""After nodetree creation, set UVMap in nodes."""
if pyprimitive.material is None:
return
if gltf.data.materials[pyprimitive.material].extensions \
and "KHR_materials_pbrSpecularGlossiness" in \
gltf.data.materials[pyprimitive.material].extensions.keys():
if pyprimitive.material is not None \
and gltf.data.materials[pyprimitive.material].extensions[
'KHR_materials_pbrSpecularGlossiness'
]['diffuse_type'] in [gltf.TEXTURE, gltf.TEXTURE_FACTOR]:
BlenderMaterial.set_uvmap(gltf, pyprimitive.material, pyprimitive, obj, vertex_color)
else:
if pyprimitive.material is not None \
and gltf.data.materials[pyprimitive.material].extensions[
'KHR_materials_pbrSpecularGlossiness'
]['specgloss_type'] in [gltf.TEXTURE, gltf.TEXTURE_FACTOR]:
BlenderMaterial.set_uvmap(gltf, pyprimitive.material, pyprimitive, obj, vertex_color)
else:
if pyprimitive.material is not None \
and gltf.data.materials[pyprimitive.material].pbr_metallic_roughness.color_type in \
[gltf.TEXTURE, gltf.TEXTURE_FACTOR]:
BlenderMaterial.set_uvmap(gltf, pyprimitive.material, pyprimitive, obj, vertex_color)
else:
if pyprimitive.material is not None \
and gltf.data.materials[pyprimitive.material].pbr_metallic_roughness.metallic_type in \
[gltf.TEXTURE, gltf.TEXTURE_FACTOR]:
BlenderMaterial.set_uvmap(gltf, pyprimitive.material, pyprimitive, obj, vertex_color)
def assign_material(gltf, pyprimitive, obj, bm, offset, cpt_index_mat):
"""Assign material to faces of primitives."""
if pyprimitive.material is not None:
vertex_color = None
if 'COLOR_0' in pyprimitive.attributes.keys():
vertex_color = 'COLOR_0'
obj.data.materials.append(bpy.data.materials[gltf.data.materials[pyprimitive.material].blender_material[vertex_color]])
for vert in bm.verts:
if vert.index in range(offset, offset + pyprimitive.vertices_length):
for loop in vert.link_loops:
face = loop.face.index
bm.faces[face].material_index = cpt_index_mat
cpt_index_mat += 1
offset = offset + pyprimitive.vertices_length
return offset, cpt_index_mat
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