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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
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, cached_by_key
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
def get_mesh_cache_key(blender_mesh,
blender_object,
vertex_groups,
modifiers,
skip_filter,
materials,
original_mesh,
export_settings):
# Use id of original mesh
# Do not use bpy.types that can be unhashable
# Do not use mesh name, that can be not unique (when linked)
# If materials are not exported, no need to cache by material
if export_settings['gltf_materials'] is None:
mats = None
else:
mats = tuple(id(m) if m is not None else None for m in materials)
# TODO check what is really needed for modifiers
mesh_to_id_cache = blender_mesh if original_mesh is None else original_mesh
return (
(id(mesh_to_id_cache),),
(modifiers,),
(skip_filter,), #TODO to check if still needed
mats
)
@cached_by_key(key=get_mesh_cache_key)
def gather_mesh(blender_mesh: bpy.types.Mesh,
uuid_for_skined_data,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
skip_filter: bool,
materials: Tuple[bpy.types.Material],
original_mesh: bpy.types.Mesh,
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),
weights=__gather_weights(blender_mesh, vertex_groups, modifiers, export_settings),
primitives=__gather_primitives(blender_mesh, uuid_for_skined_data, vertex_groups, modifiers, materials, export_settings),
)
if len(mesh.primitives) == 0:
print_console("WARNING", "Mesh '{}' has no primitives and will be omitted.".format(mesh.name))
return None
blender_object = None
if uuid_for_skined_data:
blender_object = export_settings['vtree'].nodes[uuid_for_skined_data].blender_object
export_user_extensions('gather_mesh_hook',
export_settings,
mesh,
blender_mesh,
blender_object,
vertex_groups,
modifiers,
skip_filter,
materials)
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,
uuid_for_skined_data,
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
materials: Tuple[bpy.types.Material],
export_settings
) -> List[gltf2_io.MeshPrimitive]:
return gltf2_blender_gather_primitives.gather_primitives(blender_mesh,
uuid_for_skined_data,
vertex_groups,
modifiers,
materials,
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]]:
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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