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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2022 The glTF-Blender-IO authors.
from io_scene_gltf2.io.com.gltf2_io_extensions import Extension
from io_scene_gltf2.blender.exp import gltf2_blender_get
from io_scene_gltf2.io.com.gltf2_io_constants import GLTF_IOR
def export_ior(blender_material, extensions, export_settings):
ior_socket = gltf2_blender_get.get_socket(blender_material, 'IOR')
if not ior_socket:
return None
# We don't manage case where socket is linked, always check default value
if ior_socket.is_linked:
# TODOExt: add warning?
return None
if ior_socket.default_value == GLTF_IOR:
return None
# Export only if the following extensions are exported:
need_to_export_ior = [
'KHR_materials_transmission',
'KHR_materials_volume',
'KHR_materials_specular'
]
if not any([e in extensions.keys() for e in need_to_export_ior]):
return None
ior_extension = {}
ior_extension['ior'] = ior_socket.default_value
return Extension('KHR_materials_ior', ior_extension, False)
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