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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import time
import bpy
import sys
import traceback
from io_scene_gltf2.blender.com import gltf2_blender_json
from io_scene_gltf2.blender.exp import gltf2_blender_export_keys
from io_scene_gltf2.blender.exp import gltf2_blender_gather
from io_scene_gltf2.blender.exp.gltf2_blender_gltf2_exporter import GlTF2Exporter
from io_scene_gltf2.io.com.gltf2_io_debug import print_console, print_newline
from io_scene_gltf2.io.exp import gltf2_io_export
from io_scene_gltf2.io.exp import gltf2_io_draco_compression_extension
from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extensions
def save(context, export_settings):
"""Start the glTF 2.0 export and saves to content either to a .gltf or .glb file."""
if bpy.context.active_object is not None:
if bpy.context.active_object.mode != "OBJECT": # For linked object, you can't force OBJECT mode
bpy.ops.object.mode_set(mode='OBJECT')
original_frame = bpy.context.scene.frame_current
if not export_settings['gltf_current_frame']:
bpy.context.scene.frame_set(0)
__notify_start(context)
start_time = time.time()
pre_export_callbacks = export_settings["pre_export_callbacks"]
for callback in pre_export_callbacks:
callback(export_settings)
json, buffer = __export(export_settings)
post_export_callbacks = export_settings["post_export_callbacks"]
for callback in post_export_callbacks:
callback(export_settings)
__write_file(json, buffer, export_settings)
end_time = time.time()
__notify_end(context, end_time - start_time)
if not export_settings['gltf_current_frame']:
bpy.context.scene.frame_set(int(original_frame))
return {'FINISHED'}
def __export(export_settings):
exporter = GlTF2Exporter(export_settings)
__gather_gltf(exporter, export_settings)
buffer = __create_buffer(exporter, export_settings)
exporter.finalize_images()
export_user_extensions('gather_gltf_extensions_hook', export_settings, exporter.glTF)
exporter.traverse_extensions()
# now that addons possibly add some fields in json, we can fix in needed
json = __fix_json(exporter.glTF.to_dict())
return json, buffer
def __gather_gltf(exporter, export_settings):
active_scene_idx, scenes, animations = gltf2_blender_gather.gather_gltf2(export_settings)
if export_settings['gltf_draco_mesh_compression']:
gltf2_io_draco_compression_extension.encode_scene_primitives(scenes, export_settings)
exporter.add_draco_extension()
export_user_extensions('gather_gltf_hook', export_settings, active_scene_idx, scenes, animations)
for idx, scene in enumerate(scenes):
exporter.add_scene(scene, idx==active_scene_idx)
for animation in animations:
exporter.add_animation(animation)
def __create_buffer(exporter, export_settings):
buffer = bytes()
if export_settings[gltf2_blender_export_keys.FORMAT] == 'GLB':
buffer = exporter.finalize_buffer(export_settings[gltf2_blender_export_keys.FILE_DIRECTORY], is_glb=True)
else:
if export_settings[gltf2_blender_export_keys.FORMAT] == 'GLTF_EMBEDDED':
exporter.finalize_buffer(export_settings[gltf2_blender_export_keys.FILE_DIRECTORY])
else:
exporter.finalize_buffer(export_settings[gltf2_blender_export_keys.FILE_DIRECTORY],
export_settings[gltf2_blender_export_keys.BINARY_FILENAME])
return buffer
def __fix_json(obj):
# TODO: move to custom JSON encoder
fixed = obj
if isinstance(obj, dict):
fixed = {}
for key, value in obj.items():
if key == 'extras' and value is not None:
fixed[key] = value
continue
if not __should_include_json_value(key, value):
continue
fixed[key] = __fix_json(value)
elif isinstance(obj, list):
fixed = []
for value in obj:
fixed.append(__fix_json(value))
elif isinstance(obj, float):
# force floats to int, if they are integers (prevent INTEGER_WRITTEN_AS_FLOAT validator warnings)
if int(obj) == obj:
return int(obj)
return fixed
def __should_include_json_value(key, value):
allowed_empty_collections = ["KHR_materials_unlit"]
if value is None:
return False
elif __is_empty_collection(value) and key not in allowed_empty_collections:
return False
return True
def __is_empty_collection(value):
return (isinstance(value, dict) or isinstance(value, list)) and len(value) == 0
def __write_file(json, buffer, export_settings):
try:
gltf2_io_export.save_gltf(
json,
export_settings,
gltf2_blender_json.BlenderJSONEncoder,
buffer)
except AssertionError as e:
_, _, tb = sys.exc_info()
traceback.print_tb(tb) # Fixed format
tb_info = traceback.extract_tb(tb)
for tbi in tb_info:
filename, line, func, text = tbi
print_console('ERROR', 'An error occurred on line {} in statement {}'.format(line, text))
print_console('ERROR', str(e))
raise e
def __notify_start(context):
print_console('INFO', 'Starting glTF 2.0 export')
context.window_manager.progress_begin(0, 100)
context.window_manager.progress_update(0)
def __notify_end(context, elapsed):
print_console('INFO', 'Finished glTF 2.0 export in {} s'.format(elapsed))
context.window_manager.progress_end()
print_newline()
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