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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 typing import Optional, Dict, List, Any, Tuple
from .gltf2_blender_export_keys import MORPH
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.blender.exp import gltf2_blender_gather_primitives
from ..com.gltf2_blender_extras import generate_extras
from io_scene_gltf2.io.com.gltf2_io_debug import print_console
from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extensions
@cached
def gather_mesh(blender_mesh: bpy.types.Mesh,
blender_object: Optional[bpy.types.Object],
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
skip_filter: bool,
material_names: Tuple[str],
export_settings
) -> Optional[gltf2_io.Mesh]:
if not skip_filter and not __filter_mesh(blender_mesh, vertex_groups, modifiers, export_settings):
return None
mesh = gltf2_io.Mesh(
extensions=__gather_extensions(blender_mesh, vertex_groups, modifiers, export_settings),
extras=__gather_extras(blender_mesh, vertex_groups, modifiers, export_settings),
name=__gather_name(blender_mesh, vertex_groups, modifiers, export_settings),
primitives=__gather_primitives(blender_mesh, blender_object, vertex_groups, modifiers, material_names, export_settings),
weights=__gather_weights(blender_mesh, vertex_groups, modifiers, export_settings)
)
if len(mesh.primitives) == 0:
print_console("WARNING", "Mesh '{}' has no primitives and will be omitted.".format(mesh.name))
return None
export_user_extensions('gather_mesh_hook',
export_settings,
mesh,
blender_mesh,
blender_object,
vertex_groups,
modifiers,
skip_filter,
material_names)
return mesh
def __filter_mesh(blender_mesh: bpy.types.Mesh,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> bool:
if blender_mesh.users == 0:
return False
return True
def __gather_extensions(blender_mesh: bpy.types.Mesh,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> Any:
return None
def __gather_extras(blender_mesh: bpy.types.Mesh,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> Optional[Dict[Any, Any]]:
extras = {}
if export_settings['gltf_extras']:
extras = generate_extras(blender_mesh) or {}
if export_settings[MORPH] and blender_mesh.shape_keys:
morph_max = len(blender_mesh.shape_keys.key_blocks) - 1
if morph_max > 0:
target_names = []
for blender_shape_key in blender_mesh.shape_keys.key_blocks:
if blender_shape_key != blender_shape_key.relative_key:
if blender_shape_key.mute is False:
target_names.append(blender_shape_key.name)
extras['targetNames'] = target_names
if extras:
return extras
return None
def __gather_name(blender_mesh: bpy.types.Mesh,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> str:
return blender_mesh.name
def __gather_primitives(blender_mesh: bpy.types.Mesh,
blender_object: Optional[bpy.types.Object],
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
material_names: Tuple[str],
export_settings
) -> List[gltf2_io.MeshPrimitive]:
return gltf2_blender_gather_primitives.gather_primitives(blender_mesh,
blender_object,
vertex_groups,
modifiers,
material_names,
export_settings)
def __gather_weights(blender_mesh: bpy.types.Mesh,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> Optional[List[float]]:
# Seems that in some files, when using Apply Modifier, shape_keys return an error
# ReferenceError: StructRNA of type Mesh has been removed
# Because shapekeys are not exported in that case, we can return None
try:
blender_mesh.shape_keys
except:
return None
if not export_settings[MORPH] or not blender_mesh.shape_keys:
return None
morph_max = len(blender_mesh.shape_keys.key_blocks) - 1
if morph_max <= 0:
return None
weights = []
for blender_shape_key in blender_mesh.shape_keys.key_blocks:
if blender_shape_key != blender_shape_key.relative_key:
if blender_shape_key.mute is False:
weights.append(blender_shape_key.value)
return weights
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