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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
from ...io.com.gltf2_io import TextureInfo
from .gltf2_blender_pbrMetallicRoughness import \
base_color, emission, normal, occlusion, make_output_nodes, make_settings_node
from .gltf2_blender_texture import texture
def pbr_specular_glossiness(mh):
"""Creates node tree for pbrSpecularGlossiness materials."""
# This does option #1 from
# https://github.com/KhronosGroup/glTF-Blender-IO/issues/303
# Sum a Glossy and Diffuse Shader
glossy_node = mh.node_tree.nodes.new('ShaderNodeBsdfGlossy')
diffuse_node = mh.node_tree.nodes.new('ShaderNodeBsdfDiffuse')
add_node = mh.node_tree.nodes.new('ShaderNodeAddShader')
glossy_node.location = 10, 220
diffuse_node.location = 10, 0
add_node.location = 230, 100
mh.node_tree.links.new(add_node.inputs[0], glossy_node.outputs[0])
mh.node_tree.links.new(add_node.inputs[1], diffuse_node.outputs[0])
emission_socket, alpha_socket = make_output_nodes(
mh,
location=(370, 250),
shader_socket=add_node.outputs[0],
make_emission_socket=mh.needs_emissive(),
make_alpha_socket=not mh.is_opaque(),
)
emission(
mh,
location=(-200, 860),
color_socket=emission_socket,
)
base_color(
mh,
is_diffuse=True,
location=(-200, 380),
color_socket=diffuse_node.inputs['Color'],
alpha_socket=alpha_socket,
)
specular_glossiness(
mh,
location=(-200, -100),
specular_socket=glossy_node.inputs['Color'],
roughness_socket=glossy_node.inputs['Roughness'],
)
copy_socket(
mh,
copy_from=glossy_node.inputs['Roughness'],
copy_to=diffuse_node.inputs['Roughness'],
)
normal(
mh,
location=(-200, -580),
normal_socket=glossy_node.inputs['Normal'],
)
copy_socket(
mh,
copy_from=glossy_node.inputs['Normal'],
copy_to=diffuse_node.inputs['Normal'],
)
if mh.pymat.occlusion_texture is not None:
node = make_settings_node(mh)
node.location = (610, -1060)
occlusion(
mh,
location=(510, -970),
occlusion_socket=node.inputs['Occlusion'],
)
# [Texture] => [Spec/Gloss Factor] => [Gloss to Rough] =>
def specular_glossiness(mh, location, specular_socket, roughness_socket):
x, y = location
spec_factor = mh.pymat.extensions \
['KHR_materials_pbrSpecularGlossiness'] \
.get('specularFactor', [1, 1, 1])
gloss_factor = mh.pymat.extensions \
['KHR_materials_pbrSpecularGlossiness'] \
.get('glossinessFactor', 1)
spec_gloss_texture = mh.pymat.extensions \
['KHR_materials_pbrSpecularGlossiness'] \
.get('specularGlossinessTexture', None)
if spec_gloss_texture is not None:
spec_gloss_texture = TextureInfo.from_dict(spec_gloss_texture)
if spec_gloss_texture is None:
specular_socket.default_value = spec_factor + [1]
roughness_socket.default_value = 1 - gloss_factor
return
# (1 - x) converts glossiness to roughness
node = mh.node_tree.nodes.new('ShaderNodeInvert')
node.label = 'Invert (Gloss to Rough)'
node.location = x - 140, y - 75
# Outputs
mh.node_tree.links.new(roughness_socket, node.outputs[0])
# Inputs
node.inputs['Fac'].default_value = 1
glossiness_socket = node.inputs['Color']
x -= 250
# Mix in spec/gloss factor
if spec_factor != [1, 1, 1] or gloss_factor != 1:
if spec_factor != [1, 1, 1]:
node = mh.node_tree.nodes.new('ShaderNodeMixRGB')
node.label = 'Specular Factor'
node.location = x - 140, y
node.blend_type = 'MULTIPLY'
# Outputs
mh.node_tree.links.new(specular_socket, node.outputs[0])
# Inputs
node.inputs['Fac'].default_value = 1.0
specular_socket = node.inputs['Color1']
node.inputs['Color2'].default_value = spec_factor + [1]
if gloss_factor != 1:
node = mh.node_tree.nodes.new('ShaderNodeMath')
node.label = 'Glossiness Factor'
node.location = x - 140, y - 200
node.operation = 'MULTIPLY'
# Outputs
mh.node_tree.links.new(glossiness_socket, node.outputs[0])
# Inputs
glossiness_socket = node.inputs[0]
node.inputs[1].default_value = gloss_factor
x -= 200
texture(
mh,
tex_info=spec_gloss_texture,
label='SPECULAR GLOSSINESS',
location=(x, y),
color_socket=specular_socket,
alpha_socket=glossiness_socket,
)
def copy_socket(mh, copy_from, copy_to):
"""Copy the links/default value from one socket to another."""
copy_to.default_value = copy_from.default_value
for link in copy_from.links:
mh.node_tree.links.new(copy_to, link.from_socket)
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