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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 mathutils import Vector
from ...io.imp.gltf2_io_binary import BinaryData
from .gltf2_blender_animation_utils import simulate_stash, make_fcurve
# In Blender we animate a pose bone. The final TRS of the bone depends on
# both the edit bone and pose bone
#
# Final = EditBone * PoseBone
# where
# Final = Trans[ft] Rot[fr] Scale[fs]
# EditBone = Trans[et] Rot[er] (edit bones have no scale)
# PoseBone = Trans[pt] Rot[pr] Scale[ps]
#
# Given Final we can solve for the PoseBone we need to use with
#
# pt = Rot[er^{-1}] (ft - et)
# pr = er^{-1} fr
# ps = fs
class BlenderBoneAnim():
"""Blender Bone Animation."""
def __new__(cls, *args, **kwargs):
raise RuntimeError("%s should not be instantiated" % cls)
@staticmethod
def parse_translation_channel(gltf, vnode, obj, bone, channel, animation):
"""Manage Location animation."""
blender_path = "pose.bones[" + json.dumps(bone.name) + "].location"
group_name = bone.name
keys = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].input)
values = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].output)
if animation.samplers[channel.sampler].interpolation == "CUBICSPLINE":
# TODO manage tangent?
translation_keyframes = (
gltf.loc_gltf_to_blender(values[idx * 3 + 1])
for idx in range(0, len(keys))
)
else:
translation_keyframes = (gltf.loc_gltf_to_blender(vals) for vals in values)
# Calculate pose bone trans from final bone trans
edit_trans, edit_rot = vnode.editbone_trans, vnode.editbone_rot
edit_rot_inv = edit_rot.conjugated()
pose_translations = [
edit_rot_inv @ (trans - edit_trans)
for trans in translation_keyframes
]
BlenderBoneAnim.fill_fcurves(
obj.animation_data.action,
keys,
pose_translations,
group_name,
blender_path,
animation.samplers[channel.sampler].interpolation
)
@staticmethod
def parse_rotation_channel(gltf, vnode, obj, bone, channel, animation):
"""Manage rotation animation."""
blender_path = "pose.bones[" + json.dumps(bone.name) + "].rotation_quaternion"
group_name = bone.name
keys = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].input)
values = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].output)
if animation.samplers[channel.sampler].interpolation == "CUBICSPLINE":
# TODO manage tangent?
quat_keyframes = [
gltf.quaternion_gltf_to_blender(values[idx * 3 + 1])
for idx in range(0, len(keys))
]
else:
quat_keyframes = [gltf.quaternion_gltf_to_blender(vals) for vals in values]
# Calculate pose bone rotation from final bone rotation
edit_rot = vnode.editbone_rot
edit_rot_inv = edit_rot.conjugated()
pose_rots = [
edit_rot_inv @ rot
for rot in quat_keyframes
]
# Manage antipodal quaternions
for i in range(1, len(pose_rots)):
if pose_rots[i].dot(pose_rots[i-1]) < 0:
pose_rots[i] = -pose_rots[i]
BlenderBoneAnim.fill_fcurves(
obj.animation_data.action,
keys,
pose_rots,
group_name,
blender_path,
animation.samplers[channel.sampler].interpolation
)
@staticmethod
def parse_scale_channel(gltf, vnode, obj, bone, channel, animation):
"""Manage scaling animation."""
blender_path = "pose.bones[" + json.dumps(bone.name) + "].scale"
group_name = bone.name
keys = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].input)
values = BinaryData.get_data_from_accessor(gltf, animation.samplers[channel.sampler].output)
if animation.samplers[channel.sampler].interpolation == "CUBICSPLINE":
# TODO manage tangent?
scale_keyframes = [
gltf.scale_gltf_to_blender(values[idx * 3 + 1])
for idx in range(0, len(keys))
]
else:
scale_keyframes = [gltf.scale_gltf_to_blender(vals) for vals in values]
BlenderBoneAnim.fill_fcurves(
obj.animation_data.action,
keys,
scale_keyframes,
group_name,
blender_path,
animation.samplers[channel.sampler].interpolation
)
@staticmethod
def fill_fcurves(action, keys, values, group_name, blender_path, interpolation):
"""Create FCurves from the keyframe-value pairs (one per component)."""
fps = bpy.context.scene.render.fps
coords = [0] * (2 * len(keys))
coords[::2] = (key[0] * fps for key in keys)
for i in range(0, len(values[0])):
coords[1::2] = (vals[i] for vals in values)
make_fcurve(
action,
coords,
data_path=blender_path,
index=i,
group_name=group_name,
interpolation=interpolation,
)
@staticmethod
def anim(gltf, anim_idx, node_idx):
"""Manage animation."""
node = gltf.data.nodes[node_idx]
vnode = gltf.vnodes[node_idx]
obj = gltf.vnodes[vnode.bone_arma].blender_object
bone = obj.pose.bones[vnode.blender_bone_name]
if anim_idx not in node.animations.keys():
return
animation = gltf.data.animations[anim_idx]
action = gltf.action_cache.get(obj.name)
if not action:
name = animation.track_name + "_" + obj.name
action = bpy.data.actions.new(name)
action.id_root = 'OBJECT'
gltf.needs_stash.append((obj, animation.track_name, action))
gltf.action_cache[obj.name] = action
if not obj.animation_data:
obj.animation_data_create()
obj.animation_data.action = action
for channel_idx in node.animations[anim_idx]:
channel = animation.channels[channel_idx]
if channel.target.path == "translation":
BlenderBoneAnim.parse_translation_channel(gltf, vnode, obj, bone, channel, animation)
elif channel.target.path == "rotation":
BlenderBoneAnim.parse_rotation_channel(gltf, vnode, obj, bone, channel, animation)
elif channel.target.path == "scale":
BlenderBoneAnim.parse_scale_channel(gltf, vnode, obj, bone, channel, animation)
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