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Standard Surface to glTF PBR Translation Graph (#1064)
This PR introduces a simple nodegraph for mapping standard_surface.mtlx material documents to gltf_pbr.mtlx material documents. It was implemented as part of my Summer '22 internship with Autodesk as part of a larger Standard Surface => glTF export workflow.
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libraries/bxdf/translation/standard_surface_to_gltf_pbr.mtlx
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| <?xml version="1.0"?> | ||
| <materialx version="1.38"> | ||
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| <nodedef name="ND_standard_surface_to_gltf_pbr" node="standard_surface_to_gltf_pbr"> | ||
| <input name="base" type="float" value="1" /> | ||
| <input name="base_color" type="color3" value="0.8, 0.8, 0.8" /> | ||
| <input name="metalness" type="float" value="0" /> | ||
| <input name="specular_roughness" type="float" value="0.2" /> | ||
| <input name="transmission" type="float" value="0" /> | ||
| <input name="transmission_color" type="color3" value="1, 1, 1" /> | ||
| <input name="transmission_depth" type="float" value="0" /> | ||
| <input name="sheen" type="float" value="0" /> | ||
| <input name="sheen_color" type="color3" value="1, 1, 1" /> | ||
| <input name="sheen_roughness" type="float" value="0.3" /> | ||
| <input name="coat" type="float" value="0" /> | ||
| <input name="coat_color" type="color3" value="0, 0, 0" /> | ||
| <input name="coat_roughness" type="float" value="0.1" /> | ||
| <input name="emission" type="float" value="0" /> | ||
| <input name="emission_color" type="color3" value="1, 1, 1" /> | ||
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| <output name="base_color_out" type="color3" /> | ||
| <output name="metallic_out" type="float" /> | ||
| <output name="roughness_out" type="float" /> | ||
| <output name="transmission_out" type="float" /> | ||
| <output name="thickness_out" type="float" /> | ||
| <output name="attenuation_color_out" type="color3" /> | ||
| <output name="sheen_color_out" type="color3" /> | ||
| <output name="sheen_roughness_out" type="float" /> | ||
| <output name="clearcoat_out" type="float" /> | ||
| <output name="clearcoat_roughness_out" type="float" /> | ||
| <output name="emissive_out" type="color3" /> | ||
| <output name="emissive_strength_out" type="float" /> | ||
| </nodedef> | ||
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| <nodegraph name="NG_standard_surface_to_gltf_pbr" nodedef="ND_standard_surface_to_gltf_pbr"> | ||
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| <!-- Coat attenuation --> | ||
| <dotproduct name="has_coat_color" type="float"> | ||
| <input name="in1" type="vector3" interfacename="coat_color" channels="rgb" /> | ||
| <input name="in2" type="vector3" value="1,1,1" /> | ||
| </dotproduct> | ||
| <multiply name="scaledBaseColor" type="color3"> | ||
| <input name="in1" type="color3" interfacename="base_color" /> | ||
| <input name="in2" type="float" interfacename="base" /> | ||
| </multiply> | ||
| <mix name="coatAttenuation" type="color3"> | ||
| <input name="fg" type="color3" interfacename="coat_color" /> | ||
| <input name="bg" type="color3" value="1.0, 1.0, 1.0" /> | ||
| <input name="mix" type="float" interfacename="coat" /> | ||
| </mix> | ||
| <multiply name="mixedBaseColor" type="color3"> | ||
| <input name="in1" type="color3" nodename="scaledBaseColor" /> | ||
| <input name="in2" type="color3" nodename="coatAttenuation" /> | ||
| </multiply> | ||
| <divide name="constantOneThird" type="float"> | ||
| <input name="in1" type="float" value="1" /> | ||
| <input name="in2" type="float" value="3" /> | ||
| </divide> | ||
| <multiply name="coatColor" type="color3"> | ||
| <input name="in1" type="color3" interfacename="coat_color" /> | ||
| <input name="in2" type="float" interfacename="coat" /> | ||
| </multiply> | ||
| <dotproduct name="weightedCoat" type="float"> | ||
| <input name="in1" type="vector3" nodename="coatColor" channels="rgb" /> | ||
| <input name="in2" type="vector3" nodename="constantOneThird" channels="xxx" /> | ||
| </dotproduct> | ||
|
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||
| <!-- Metallic roughness --> | ||
| <ifequal name="base_color" type="color3"> | ||
| <input name="value1" type="float" nodename="has_coat_color" /> | ||
| <input name="value2" type="float" value="0" /> | ||
| <input name="in1" type="color3" nodename="scaledBaseColor" /> | ||
| <input name="in2" type="color3" nodename="mixedBaseColor" /> | ||
| </ifequal> | ||
| <dot name="metallic" type="float"> | ||
| <input name="in" type="float" interfacename="metalness" /> | ||
| </dot> | ||
| <dot name="roughness" type="float"> | ||
| <input name="in" type="float" interfacename="specular_roughness" /> | ||
| </dot> | ||
|
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| <!-- Transmission --> | ||
| <dot name="transmission" type="float"> | ||
| <input name="in" type="float" interfacename="transmission" /> | ||
| </dot> | ||
| <dot name="thickness" type="float"> | ||
| <input name="in" type="float" interfacename="transmission_depth" /> | ||
| </dot> | ||
| <dot name="attenuation_color" type="color3"> | ||
| <input name="in" type="color3" interfacename="transmission_color" /> | ||
| </dot> | ||
|
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||
| <!-- Sheen --> | ||
| <multiply name="sheen_color" type="color3"> | ||
| <input name="in1" type="color3" interfacename="sheen_color" /> | ||
| <input name="in2" type="float" interfacename="sheen" /> | ||
| </multiply> | ||
| <dot name="sheen_roughness" type="float"> | ||
| <input name="in" type="float" interfacename="sheen_roughness" /> | ||
| </dot> | ||
|
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||
| <!-- Clearcoat --> | ||
| <ifequal name="clearcoat" type="float"> | ||
| <input name="value1" type="float" nodename="has_coat_color" /> | ||
| <input name="value2" type="float" value="0" /> | ||
| <input name="in1" type="float" interfacename="coat" /> | ||
| <input name="in2" type="float" nodename="weightedCoat" /> | ||
| </ifequal> | ||
| <dot name="clearcoat_roughness" type="float"> | ||
| <input name="in" type="float" interfacename="coat_roughness" /> | ||
| </dot> | ||
|
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||
| <!-- Emission --> | ||
| <dot name="emissive" type="color3"> | ||
| <input name="in" type="color3" interfacename="emission_color" /> | ||
| </dot> | ||
| <dot name="emissive_strength" type="float"> | ||
| <input name="in" type="float" interfacename="emission" /> | ||
| </dot> | ||
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| <output name="base_color_out" type="color3" nodename="base_color" /> | ||
| <output name="metallic_out" type="float" nodename="metallic" /> | ||
| <output name="roughness_out" type="float" nodename="roughness" /> | ||
| <output name="transmission_out" type="float" nodename="transmission" /> | ||
| <output name="thickness_out" type="float" nodename="thickness" /> | ||
| <output name="attenuation_color_out" type="color3" nodename="attenuation_color" /> | ||
| <output name="sheen_color_out" type="color3" nodename="sheen_color" /> | ||
| <output name="sheen_roughness_out" type="float" nodename="sheen_roughness" /> | ||
| <output name="clearcoat_out" type="float" nodename="clearcoat" /> | ||
| <output name="clearcoat_roughness_out" type="float" nodename="clearcoat_roughness" /> | ||
| <output name="emissive_out" type="color3" nodename="emissive" /> | ||
| <output name="emissive_strength_out" type="float" nodename="emissive_strength" /> | ||
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| </nodegraph> | ||
| </materialx> |