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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 bpy
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.io.com.gltf2_io_debug import print_console
from io_scene_gltf2.blender.exp import gltf2_blender_gather_nodes
from io_scene_gltf2.blender.exp import gltf2_blender_gather_animations
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.blender.exp import gltf2_blender_generate_extras
from io_scene_gltf2.blender.exp import gltf2_blender_export_keys
def gather_gltf2(export_settings):
"""
Gather glTF properties from the current state of blender.
:return: list of scene graphs to be added to the glTF export
"""
scenes = []
animations = [] # unfortunately animations in gltf2 are just as 'root' as scenes.
active_scene = None
for blender_scene in bpy.data.scenes:
scenes.append(__gather_scene(blender_scene, export_settings))
if export_settings[gltf2_blender_export_keys.ANIMATIONS]:
animations += __gather_animations(blender_scene, export_settings)
if bpy.context.scene.name == blender_scene.name:
active_scene = len(scenes) -1
return active_scene, scenes, animations
@cached
def __gather_scene(blender_scene, export_settings):
scene = gltf2_io.Scene(
extensions=None,
extras=__gather_extras(blender_scene, export_settings),
name=blender_scene.name,
nodes=[]
)
for blender_object in blender_scene.objects:
if blender_object.parent is None:
node = gltf2_blender_gather_nodes.gather_node(blender_object, blender_scene, export_settings)
if node is not None:
scene.nodes.append(node)
return scene
def __gather_animations(blender_scene, export_settings):
animations = []
merged_tracks = {}
for blender_object in blender_scene.objects:
# First check if this object is exported or not. Do not export animation of not exported object
obj_node = gltf2_blender_gather_nodes.gather_node(blender_object, blender_scene, export_settings)
if obj_node is not None:
animations_, merged_tracks = gltf2_blender_gather_animations.gather_animations(blender_object, merged_tracks, len(animations), export_settings)
animations += animations_
if export_settings['gltf_nla_strips'] is False:
# Fake an animation with all animations of the scene
merged_tracks = {}
merged_tracks['Animation'] = []
for idx, animation in enumerate(animations):
merged_tracks['Animation'].append(idx)
to_delete_idx = []
for merged_anim_track in merged_tracks.keys():
if len(merged_tracks[merged_anim_track]) < 2:
continue
base_animation_idx = None
offset_sampler = 0
for idx, anim_idx in enumerate(merged_tracks[merged_anim_track]):
if idx == 0:
base_animation_idx = anim_idx
animations[anim_idx].name = merged_anim_track
already_animated = []
for channel in animations[anim_idx].channels:
already_animated.append((channel.target.node, channel.target.path))
continue
to_delete_idx.append(anim_idx)
offset_sampler = len(animations[base_animation_idx].samplers)
for sampler in animations[anim_idx].samplers:
animations[base_animation_idx].samplers.append(sampler)
for channel in animations[anim_idx].channels:
if (channel.target.node, channel.target.path) in already_animated:
print_console("WARNING", "Some strips have same channel animation ({}), on node {} !".format(channel.target.path, channel.target.node.name))
continue
animations[base_animation_idx].channels.append(channel)
animations[base_animation_idx].channels[-1].sampler = animations[base_animation_idx].channels[-1].sampler + offset_sampler
already_animated.append((channel.target.node, channel.target.path))
new_animations = []
if len(to_delete_idx) != 0:
for idx, animation in enumerate(animations):
if idx in to_delete_idx:
continue
new_animations.append(animation)
else:
new_animations = animations
return new_animations
def __gather_extras(blender_object, export_settings):
if export_settings[gltf2_blender_export_keys.EXTRAS]:
return gltf2_blender_generate_extras.generate_extras(blender_object)
return None
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