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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import bpy
from typing import List, Optional, Tuple
import numpy as np
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_accessors
from io_scene_gltf2.blender.exp import gltf2_blender_gather_primitive_attributes
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,
library: Optional[str],
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]:
"""
Extract the mesh primitives from a blender object
:return: a list of glTF2 primitives
"""
primitives = []
blender_primitives = __gather_cache_primitives(blender_mesh, library, blender_object,
vertex_groups, modifiers, export_settings)
for internal_primitive in blender_primitives:
material_idx = internal_primitive['material']
material = None
if export_settings['gltf_materials'] == "EXPORT" and material_idx is not None:
blender_material = None
if material_names:
i = material_idx if material_idx < len(material_names) else -1
material_name = material_names[i]
if material_name is not None:
blender_material = bpy.data.materials[material_name]
if blender_material is not None:
material = gltf2_blender_gather_materials.gather_material(
blender_material,
export_settings,
)
primitive = gltf2_io.MeshPrimitive(
attributes=internal_primitive['attributes'],
extensions=None,
extras=None,
indices=internal_primitive['indices'],
material=material,
mode=internal_primitive['mode'],
targets=internal_primitive['targets']
)
primitives.append(primitive)
return primitives
@cached
def __gather_cache_primitives(
blender_mesh: bpy.types.Mesh,
library: Optional[str],
blender_object: Optional[bpy.types.Object],
vertex_groups: Optional[bpy.types.VertexGroups],
modifiers: Optional[bpy.types.ObjectModifiers],
export_settings
) -> List[dict]:
"""
Gather parts that are identical for instances, i.e. excluding materials
"""
primitives = []
blender_primitives = gltf2_blender_extract.extract_primitives(
None, blender_mesh, library, blender_object, vertex_groups, modifiers, export_settings)
for internal_primitive in blender_primitives:
primitive = {
"attributes": __gather_attributes(internal_primitive, blender_mesh, modifiers, export_settings),
"indices": __gather_indices(internal_primitive, blender_mesh, modifiers, export_settings),
"mode": internal_primitive.get('mode'),
"material": internal_primitive.get('material'),
"targets": __gather_targets(internal_primitive, blender_mesh, modifiers, export_settings)
}
primitives.append(primitive)
return primitives
def __gather_indices(blender_primitive, blender_mesh, modifiers, export_settings):
indices = blender_primitive.get('indices')
if indices is None:
return None
# NOTE: Values used by some graphics APIs as "primitive restart" values are disallowed.
# Specifically, the values 65535 (in UINT16) and 4294967295 (in UINT32) cannot be used as indices.
# https://github.com/KhronosGroup/glTF/issues/1142
# https://github.com/KhronosGroup/glTF/pull/1476/files
# Also, UINT8 mode is not supported:
# https://github.com/KhronosGroup/glTF/issues/1471
max_index = indices.max()
if max_index < 65535:
component_type = gltf2_io_constants.ComponentType.UnsignedShort
indices = indices.astype(np.uint16, copy=False)
elif max_index < 4294967295:
component_type = gltf2_io_constants.ComponentType.UnsignedInt
indices = indices.astype(np.uint32, copy=False)
else:
print_console('ERROR', 'A mesh contains too many vertices (' + str(max_index) + ') and needs to be split before export.')
return None
element_type = gltf2_io_constants.DataType.Scalar
binary_data = gltf2_io_binary_data.BinaryData(indices.tobytes())
return gltf2_blender_gather_accessors.gather_accessor(
binary_data,
component_type,
len(indices),
None,
None,
element_type,
export_settings
)
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:
continue
if blender_shape_key.mute is True:
continue
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) is not None:
target = {}
internal_target_position = blender_primitive["attributes"][target_position_id]
target["POSITION"] = gltf2_blender_gather_primitive_attributes.array_to_accessor(
internal_target_position,
component_type=gltf2_io_constants.ComponentType.Float,
data_type=gltf2_io_constants.DataType.Vec3,
include_max_and_min=True,
)
if export_settings[NORMALS] \
and export_settings[MORPH_NORMAL] \
and blender_primitive["attributes"].get(target_normal_id) is not None:
internal_target_normal = blender_primitive["attributes"][target_normal_id]
target['NORMAL'] = gltf2_blender_gather_primitive_attributes.array_to_accessor(
internal_target_normal,
component_type=gltf2_io_constants.ComponentType.Float,
data_type=gltf2_io_constants.DataType.Vec3,
)
if export_settings[TANGENTS] \
and export_settings[MORPH_TANGENT] \
and blender_primitive["attributes"].get(target_tangent_id) is not None:
internal_target_tangent = blender_primitive["attributes"][target_tangent_id]
target['TANGENT'] = gltf2_blender_gather_primitive_attributes.array_to_accessor(
internal_target_tangent,
component_type=gltf2_io_constants.ComponentType.Float,
data_type=gltf2_io_constants.DataType.Vec3,
)
targets.append(target)
morph_index += 1
return targets
return None
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