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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2022 The glTF-Blender-IO authors.
from ...io.com.gltf2_io import TextureInfo, MaterialNormalTextureInfoClass
from .gltf2_blender_texture import texture
# [Texture] => [Separate R] => [Transmission Factor] =>
def transmission(mh, location, transmission_socket):
x, y = location
try:
ext = mh.pymat.extensions['KHR_materials_transmission']
except Exception:
return
transmission_factor = ext.get('transmissionFactor', 0)
# Default value is 0, so no transmission
if transmission_factor == 0:
return
tex_info = ext.get('transmissionTexture')
if tex_info is not None:
tex_info = TextureInfo.from_dict(tex_info)
if transmission_socket is None:
return
if tex_info is None:
transmission_socket.default_value = transmission_factor
return
# Mix transmission factor
if transmission_factor != 1:
node = mh.node_tree.nodes.new('ShaderNodeMath')
node.label = 'Transmission Factor'
node.location = x - 140, y
node.operation = 'MULTIPLY'
# Outputs
mh.node_tree.links.new(transmission_socket, node.outputs[0])
# Inputs
transmission_socket = node.inputs[0]
node.inputs[1].default_value = transmission_factor
x -= 200
# Separate RGB
node = mh.node_tree.nodes.new('ShaderNodeSeparateColor')
node.location = x - 150, y - 75
# Outputs
mh.node_tree.links.new(transmission_socket, node.outputs['Red'])
# Inputs
transmission_socket = node.inputs[0]
x -= 200
texture(
mh,
tex_info=tex_info,
label='TRANSMISSION',
location=(x, y),
is_data=True,
color_socket=transmission_socket,
)
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