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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 json
import bpy
from ...io.imp.gltf2_io_binary import BinaryData
from .gltf2_blender_animation_utils import simulate_stash, make_fcurve
class BlenderWeightAnim():
"""Blender ShapeKey Animation."""
def __new__(cls, *args, **kwargs):
raise RuntimeError("%s should not be instantiated" % cls)
@staticmethod
def anim(gltf, anim_idx, vnode_id):
"""Manage animation."""
vnode = gltf.vnodes[vnode_id]
node_idx = vnode.mesh_node_idx
if node_idx is None:
return
node = gltf.data.nodes[node_idx]
obj = vnode.blender_object
fps = bpy.context.scene.render.fps
animation = gltf.data.animations[anim_idx]
if anim_idx not in node.animations.keys():
return
for channel_idx in node.animations[anim_idx]:
channel = animation.channels[channel_idx]
if channel.target.path == "weights":
break
else:
return
name = animation.track_name + "_" + obj.name
action = bpy.data.actions.new(name)
action.id_root = "KEY"
gltf.needs_stash.append((obj.data.shape_keys, animation.track_name, action))
if not obj.data.shape_keys.animation_data:
obj.data.shape_keys.animation_data_create()
obj.data.shape_keys.animation_data.action = action
keys = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].input)
values = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].output)
# retrieve number of targets
pymesh = gltf.data.meshes[gltf.data.nodes[node_idx].mesh]
nb_targets = len(pymesh.shapekey_names)
if animation.samplers[channel.sampler].interpolation == "CUBICSPLINE":
offset = nb_targets
stride = 3 * nb_targets
else:
offset = 0
stride = nb_targets
coords = [0] * (2 * len(keys))
coords[::2] = (key[0] * fps for key in keys)
for sk in range(nb_targets):
if pymesh.shapekey_names[sk] is not None: # Do not animate shapekeys not created
coords[1::2] = (values[offset + stride * i + sk][0] for i in range(len(keys)))
kb_name = pymesh.shapekey_names[sk]
data_path = "key_blocks[" + json.dumps(kb_name) + "].value"
make_fcurve(
action,
coords,
data_path=data_path,
group_name="ShapeKeys",
interpolation=animation.samplers[channel.sampler].interpolation,
)
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