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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import bpy
from mathutils import Vector
from ..com.gltf2_blender_extras import set_extras
from .gltf2_blender_mesh import BlenderMesh
from .gltf2_blender_camera import BlenderCamera
from .gltf2_blender_light import BlenderLight
from .gltf2_blender_vnode import VNode
from io_scene_gltf2.io.imp.gltf2_io_user_extensions import import_user_extensions
class BlenderNode():
"""Blender Node."""
def __new__(cls, *args, **kwargs):
raise RuntimeError("%s should not be instantiated" % cls)
@staticmethod
def create_vnode(gltf, vnode_id):
"""Create VNode and all its descendants."""
vnode = gltf.vnodes[vnode_id]
gltf.display_current_node += 1
if bpy.app.debug_value == 101:
gltf.log.critical("Node %d of %d (id %s)", gltf.display_current_node, len(gltf.vnodes), vnode_id)
if vnode.type == VNode.Object:
gltf_node = gltf.data.nodes[vnode_id] if isinstance(vnode_id, int) else None
import_user_extensions('gather_import_node_before_hook', gltf, vnode, gltf_node)
obj = BlenderNode.create_object(gltf, vnode_id)
import_user_extensions('gather_import_node_after_hook', gltf, vnode, gltf_node, obj)
if vnode.is_arma:
BlenderNode.create_bones(gltf, vnode_id)
elif vnode.type == VNode.Bone:
# These are created with their armature
pass
elif vnode.type == VNode.DummyRoot:
# Don't actually create this
vnode.blender_object = None
for child in vnode.children:
BlenderNode.create_vnode(gltf, child)
@staticmethod
def create_object(gltf, vnode_id):
vnode = gltf.vnodes[vnode_id]
if vnode.mesh_node_idx is not None:
obj = BlenderNode.create_mesh_object(gltf, vnode)
elif vnode.camera_node_idx is not None:
pynode = gltf.data.nodes[vnode.camera_node_idx]
cam = BlenderCamera.create(gltf, vnode, pynode.camera)
name = vnode.name or cam.name
obj = bpy.data.objects.new(name, cam)
# Since we create the actual Blender object after the create call, we call the hook here
import_user_extensions('gather_import_camera_after_hook', gltf, vnode, obj, cam)
elif vnode.light_node_idx is not None:
pynode = gltf.data.nodes[vnode.light_node_idx]
light = BlenderLight.create(gltf, vnode, pynode.extensions['KHR_lights_punctual']['light'])
name = vnode.name or light.name
obj = bpy.data.objects.new(name, light)
# Since we create the actual Blender object after the create call, we call the hook here
import_user_extensions('gather_import_light_after_hook', gltf, vnode, obj, light)
elif vnode.is_arma:
armature = bpy.data.armatures.new(vnode.arma_name)
name = vnode.name or armature.name
obj = bpy.data.objects.new(name, armature)
else:
# Empty
name = vnode.name or vnode.default_name
obj = bpy.data.objects.new(name, None)
obj.empty_display_size = BlenderNode.calc_empty_display_size(gltf, vnode_id)
vnode.blender_object = obj
# Set extras (if came from a glTF node)
if isinstance(vnode_id, int):
pynode = gltf.data.nodes[vnode_id]
set_extras(obj, pynode.extras)
# Set transform
trans, rot, scale = vnode.trs()
obj.location = trans
obj.rotation_mode = 'QUATERNION'
obj.rotation_quaternion = rot
obj.scale = scale
# Set parent
if vnode.parent is not None:
parent_vnode = gltf.vnodes[vnode.parent]
if parent_vnode.type == VNode.Object:
obj.parent = parent_vnode.blender_object
elif parent_vnode.type == VNode.Bone:
arma_vnode = gltf.vnodes[parent_vnode.bone_arma]
obj.parent = arma_vnode.blender_object
obj.parent_type = 'BONE'
obj.parent_bone = parent_vnode.blender_bone_name
# Nodes with a bone parent need to be translated
# backwards from the tip to the root
obj.location += Vector((0, -parent_vnode.bone_length, 0))
bpy.data.scenes[gltf.blender_scene].collection.objects.link(obj)
return obj
@staticmethod
def calc_empty_display_size(gltf, vnode_id):
# Use min distance to parent/children to guess size
sizes = []
vids = [vnode_id] + gltf.vnodes[vnode_id].children
for vid in vids:
vnode = gltf.vnodes[vid]
dist = vnode.trs()[0].length
sizes.append(dist * 0.4)
return max(min(sizes, default=1), 0.001)
@staticmethod
def create_bones(gltf, arma_id):
arma = gltf.vnodes[arma_id]
blender_arma = arma.blender_object
armature = blender_arma.data
# Find all bones for this arma
bone_ids = []
def visit(id): # Depth-first walk
if gltf.vnodes[id].type == VNode.Bone:
bone_ids.append(id)
for child in gltf.vnodes[id].children:
visit(child)
for child in arma.children:
visit(child)
# Switch into edit mode to create all edit bones
if bpy.context.mode != 'OBJECT':
bpy.ops.object.mode_set(mode='OBJECT')
bpy.context.window.scene = bpy.data.scenes[gltf.blender_scene]
bpy.context.view_layer.objects.active = blender_arma
bpy.ops.object.mode_set(mode="EDIT")
for id in bone_ids:
vnode = gltf.vnodes[id]
editbone = armature.edit_bones.new(vnode.name or vnode.default_name)
vnode.blender_bone_name = editbone.name
editbone.use_connect = False # TODO?
# Give the position of the bone in armature space
arma_mat = vnode.editbone_arma_mat
editbone.head = arma_mat @ Vector((0, 0, 0))
editbone.tail = arma_mat @ Vector((0, 1, 0))
editbone.length = vnode.bone_length
editbone.align_roll(arma_mat @ Vector((0, 0, 1)) - editbone.head)
if isinstance(id, int):
pynode = gltf.data.nodes[id]
set_extras(editbone, pynode.extras)
# Set all bone parents
for id in bone_ids:
vnode = gltf.vnodes[id]
parent_vnode = gltf.vnodes[vnode.parent]
if parent_vnode.type == VNode.Bone:
editbone = armature.edit_bones[vnode.blender_bone_name]
parent_editbone = armature.edit_bones[parent_vnode.blender_bone_name]
editbone.parent = parent_editbone
# Switch back to object mode and do pose bones
bpy.ops.object.mode_set(mode="OBJECT")
for id in bone_ids:
vnode = gltf.vnodes[id]
pose_bone = blender_arma.pose.bones[vnode.blender_bone_name]
# BoneTRS = EditBone * PoseBone
# Set PoseBone to make BoneTRS = vnode.trs.
t, r, s = vnode.trs()
et, er = vnode.editbone_trans, vnode.editbone_rot
pose_bone.location = er.conjugated() @ (t - et)
pose_bone.rotation_mode = 'QUATERNION'
pose_bone.rotation_quaternion = er.conjugated() @ r
pose_bone.scale = s
if isinstance(id, int):
pynode = gltf.data.nodes[id]
set_extras(pose_bone, pynode.extras)
@staticmethod
def create_mesh_object(gltf, vnode):
pynode = gltf.data.nodes[vnode.mesh_node_idx]
if not (0 <= pynode.mesh < len(gltf.data.meshes)):
# Avoid traceback for invalid gltf file: invalid reference to meshes array
# So return an empty blender object)
return bpy.data.objects.new(vnode.name or "Invalid Mesh Index", None)
pymesh = gltf.data.meshes[pynode.mesh]
# Key to cache the Blender mesh by.
# Same cache key = instances of the same Blender mesh.
cache_key = None
if not pymesh.shapekey_names:
cache_key = (pynode.skin,)
else:
# Unlike glTF, all instances of a Blender mesh share shapekeys.
# So two instances that might have different morph weights need
# different cache keys.
if pynode.weight_animation is False:
cache_key = (pynode.skin, tuple(pynode.weights or []))
else:
cache_key = None # don't use the cache at all
if cache_key is not None and cache_key in pymesh.blender_name:
mesh = bpy.data.meshes[pymesh.blender_name[cache_key]]
else:
gltf.log.info("Blender create Mesh node %s", pymesh.name or pynode.mesh)
mesh = BlenderMesh.create(gltf, pynode.mesh, pynode.skin)
if cache_key is not None:
pymesh.blender_name[cache_key] = mesh.name
name = vnode.name or mesh.name
obj = bpy.data.objects.new(name, mesh)
if pymesh.shapekey_names:
BlenderNode.set_morph_weights(gltf, pynode, obj)
if pynode.skin is not None:
BlenderNode.setup_skinning(gltf, pynode, obj)
return obj
@staticmethod
def set_morph_weights(gltf, pynode, obj):
pymesh = gltf.data.meshes[pynode.mesh]
weights = pynode.weights or pymesh.weights or []
for i, weight in enumerate(weights):
if pymesh.shapekey_names[i] is not None:
kb = obj.data.shape_keys.key_blocks[pymesh.shapekey_names[i]]
# extend range if needed
if weight < kb.slider_min: kb.slider_min = weight
if weight > kb.slider_max: kb.slider_max = weight
kb.value = weight
@staticmethod
def setup_skinning(gltf, pynode, obj):
pyskin = gltf.data.skins[pynode.skin]
# Armature/bones should have already been created.
# Create an Armature modifier
first_bone = gltf.vnodes[pyskin.joints[0]]
arma = gltf.vnodes[first_bone.bone_arma]
mod = obj.modifiers.new(name="Armature", type="ARMATURE")
mod.object = arma.blender_object
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