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# Copyright 2018 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 typing import List, Optional
from .gltf2_blender_export_keys import NORMALS, MORPH_NORMAL, TANGENTS, MORPH_TANGENT, MORPH
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.blender.exp import gltf2_blender_extract
from io_scene_gltf2.blender.exp import gltf2_blender_gather_primitive_attributes
from io_scene_gltf2.blender.exp import gltf2_blender_utils
from io_scene_gltf2.blender.exp import gltf2_blender_gather_materials
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.io.exp import gltf2_io_binary_data
from io_scene_gltf2.io.com import gltf2_io_constants
from io_scene_gltf2.io.com.gltf2_io_debug import print_console
@cached
def gather_primitives(
blender_mesh: bpy.types.Mesh,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> List[gltf2_io.MeshPrimitive]:
"""
Extract the mesh primitives from a blender object
:return: a list of glTF2 primitives
"""
primitives = []
blender_primitives = gltf2_blender_extract.extract_primitives(
None, blender_mesh, vertex_groups, modifiers, export_settings)
for internal_primitive in blender_primitives:
primitive = gltf2_io.MeshPrimitive(
attributes=__gather_attributes(internal_primitive, blender_mesh, modifiers, export_settings),
extensions=None,
extras=None,
indices=__gather_indices(internal_primitive, blender_mesh, modifiers, export_settings),
material=__gather_materials(internal_primitive, blender_mesh, modifiers, export_settings),
mode=None,
targets=__gather_targets(internal_primitive, blender_mesh, modifiers, export_settings)
)
primitives.append(primitive)
return primitives
def __gather_materials(blender_primitive, blender_mesh, modifiers, export_settings):
if not blender_primitive['material']:
# TODO: fix 'extract_promitives' so that the value of 'material' is None and not empty string
return None
material = bpy.data.materials[blender_primitive['material']]
return gltf2_blender_gather_materials.gather_material(material, export_settings)
def __gather_indices(blender_primitive, blender_mesh, modifiers, export_settings):
indices = blender_primitive['indices']
max_index = max(indices)
if max_index < (1 << 16):
component_type = gltf2_io_constants.ComponentType.UnsignedShort
elif max_index < (1 << 32):
component_type = gltf2_io_constants.ComponentType.UnsignedInt
else:
print_console('ERROR', 'Invalid max_index: ' + str(max_index))
return None
element_type = gltf2_io_constants.DataType.Scalar
binary_data = gltf2_io_binary_data.BinaryData.from_list(indices, component_type)
return gltf2_io.Accessor(
buffer_view=binary_data,
byte_offset=None,
component_type=component_type,
count=len(indices) // gltf2_io_constants.DataType.num_elements(element_type),
extensions=None,
extras=None,
max=None,
min=None,
name=None,
normalized=None,
sparse=None,
type=element_type
)
def __gather_attributes(blender_primitive, blender_mesh, modifiers, export_settings):
return gltf2_blender_gather_primitive_attributes.gather_primitive_attributes(blender_primitive, export_settings)
def __gather_targets(blender_primitive, blender_mesh, modifiers, export_settings):
if export_settings[MORPH]:
targets = []
if blender_mesh.shape_keys is not None:
morph_index = 0
for blender_shape_key in blender_mesh.shape_keys.key_blocks:
if blender_shape_key != blender_shape_key.relative_key:
target_position_id = 'MORPH_POSITION_' + str(morph_index)
target_normal_id = 'MORPH_NORMAL_' + str(morph_index)
target_tangent_id = 'MORPH_TANGENT_' + str(morph_index)
if blender_primitive["attributes"].get(target_position_id):
target = {}
internal_target_position = blender_primitive["attributes"][target_position_id]
binary_data = gltf2_io_binary_data.BinaryData.from_list(
internal_target_position,
gltf2_io_constants.ComponentType.Float
)
target["POSITION"] = gltf2_io.Accessor(
buffer_view=binary_data,
byte_offset=None,
component_type=gltf2_io_constants.ComponentType.Float,
count=len(internal_target_position) // gltf2_io_constants.DataType.num_elements(
gltf2_io_constants.DataType.Vec3),
extensions=None,
extras=None,
max=gltf2_blender_utils.max_components(
internal_target_position, gltf2_io_constants.DataType.Vec3),
min=gltf2_blender_utils.min_components(
internal_target_position, gltf2_io_constants.DataType.Vec3),
name=None,
normalized=None,
sparse=None,
type=gltf2_io_constants.DataType.Vec3
)
if export_settings[NORMALS] \
and export_settings[MORPH_NORMAL] \
and blender_primitive["attributes"].get(target_normal_id):
internal_target_normal = blender_primitive["attributes"][target_normal_id]
binary_data = gltf2_io_binary_data.BinaryData.from_list(
internal_target_normal,
gltf2_io_constants.ComponentType.Float,
)
target['NORMAL'] = gltf2_io.Accessor(
buffer_view=binary_data,
byte_offset=None,
component_type=gltf2_io_constants.ComponentType.Float,
count=len(internal_target_normal) // gltf2_io_constants.DataType.num_elements(
gltf2_io_constants.DataType.Vec3),
extensions=None,
extras=None,
max=None,
min=None,
name=None,
normalized=None,
sparse=None,
type=gltf2_io_constants.DataType.Vec3
)
if export_settings[TANGENTS] \
and export_settings[MORPH_TANGENT] \
and blender_primitive["attributes"].get(target_tangent_id):
internal_target_tangent = blender_primitive["attributes"][target_tangent_id]
binary_data = gltf2_io_binary_data.BinaryData.from_list(
internal_target_tangent,
gltf2_io_constants.ComponentType.Float,
)
target['TANGENT'] = gltf2_io.Accessor(
buffer_view=binary_data,
byte_offset=None,
component_type=gltf2_io_constants.ComponentType.Float,
count=len(internal_target_tangent) // gltf2_io_constants.DataType.num_elements(
gltf2_io_constants.DataType.Vec3),
extensions=None,
extras=None,
max=None,
min=None,
name=None,
normalized=None,
sparse=None,
type=gltf2_io_constants.DataType.Vec3
)
targets.append(target)
morph_index += 1
return targets
return None
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