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# Copyright 2018 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 bpy
import typing
from ..com.gltf2_blender_data_path import get_target_object_path, get_target_property_name
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.io.com import gltf2_io_debug
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.blender.exp import gltf2_blender_gather_animation_samplers
from io_scene_gltf2.blender.exp import gltf2_blender_gather_animation_channel_target
@cached
def gather_animation_channels(blender_action: bpy.types.Action,
blender_object: bpy.types.Object,
export_settings
) -> typing.List[gltf2_io.AnimationChannel]:
channels = []
for channel_group in __get_channel_groups(blender_action, blender_object):
channel = __gather_animation_channel(channel_group, blender_object, export_settings)
if channel is not None:
channels.append(channel)
return channels
def __gather_animation_channel(channels: typing.Tuple[bpy.types.FCurve],
blender_object: bpy.types.Object,
export_settings
) -> typing.Union[gltf2_io.AnimationChannel, None]:
if not __filter_animation_channel(channels, blender_object, export_settings):
return None
return gltf2_io.AnimationChannel(
extensions=__gather_extensions(channels, blender_object, export_settings),
extras=__gather_extras(channels, blender_object, export_settings),
sampler=__gather_sampler(channels, blender_object, export_settings),
target=__gather_target(channels, blender_object, export_settings)
)
def __filter_animation_channel(channels: typing.Tuple[bpy.types.FCurve],
blender_object: bpy.types.Object,
export_settings
) -> bool:
return True
def __gather_extensions(channels: typing.Tuple[bpy.types.FCurve],
blender_object: bpy.types.Object,
export_settings
) -> typing.Any:
return None
def __gather_extras(channels: typing.Tuple[bpy.types.FCurve],
blender_object: bpy.types.Object,
export_settings
) -> typing.Any:
return None
def __gather_sampler(channels: typing.Tuple[bpy.types.FCurve],
blender_object: bpy.types.Object,
export_settings
) -> gltf2_io.AnimationSampler:
return gltf2_blender_gather_animation_samplers.gather_animation_sampler(
channels,
blender_object,
export_settings
)
def __gather_target(channels: typing.Tuple[bpy.types.FCurve],
blender_object: bpy.types.Object,
export_settings
) -> gltf2_io.AnimationChannelTarget:
return gltf2_blender_gather_animation_channel_target.gather_animation_channel_target(
channels, blender_object, export_settings)
def __get_channel_groups(blender_action: bpy.types.Action, blender_object: bpy.types.Object):
targets = {}
for fcurve in blender_action.fcurves:
target_property = get_target_property_name(fcurve.data_path)
object_path = get_target_object_path(fcurve.data_path)
# find the object affected by this action
if not object_path:
target = blender_object
else:
try:
target = blender_object.path_resolve(object_path)
except ValueError:
# if the object is a mesh and the action target path can not be resolved, we know that this is a morph
# animation.
if blender_object.type == "MESH":
# if you need the specific shape key for some reason, this is it:
# shape_key = blender_object.data.shape_keys.path_resolve(object_path)
target = blender_object.data.shape_keys
else:
gltf2_io_debug.print_console("WARNING", "Can not export animations with target {}".format(object_path))
continue
# group channels by target object and affected property of the target
target_properties = targets.get(target, {})
channels = target_properties.get(target_property, [])
channels.append(fcurve)
target_properties[target_property] = channels
targets[target] = target_properties
groups = []
for p in targets.values():
groups += list(p.values())
return map(tuple, groups)
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