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mkuo-lucasfilmmkuo-lucasfilm
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Initial translation from open_pbr_surface to standard_surface (#1949)
- Authored an initial pass at the translation from OpenPBR to standard surface. - This would help to support OpenPBR in applications using earlier versions of MaterialX, which only have access to Standard Surface, but may want to participate in the OpenPBR ecosystem before they upgrade.
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‎libraries/bxdf/translation/open_pbr_to_standard_surface.mtlx‎

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<?xml version="1.0"?>
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<materialx version="1.39">
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<nodedef name="ND_open_pbr_surface_to_standard_surface" node="open_pbr_surface_to_standard_surface" nodegroup="translation">
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<input name="base_weight" type="float" value="1.0" />
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<input name="base_color" type="color3" value="0.8, 0.8, 0.8" />
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<input name="base_diffuse_roughness" type="float" value="0.0" />
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<input name="base_metalness" type="float" value="0.0" />
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<input name="specular_weight" type="float" value="1.0" />
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<input name="specular_color" type="color3" value="1, 1, 1" />
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<input name="specular_roughness" type="float" value="0.3" />
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<input name="specular_ior" type="float" value="1.5" />
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<input name="specular_roughness_anisotropy" type="float" value="0.0" />
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<input name="transmission_weight" type="float" value="0.0" />
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<input name="transmission_color" type="color3" value="1, 1, 1" />
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<input name="transmission_depth" type="float" value="0.0" />
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<input name="transmission_scatter" type="color3" value="0, 0, 0" />
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<input name="transmission_scatter_anisotropy" type="float" value="0.0" />
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<input name="transmission_dispersion_scale" type="float" value="0.0" />
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<input name="subsurface_weight" type="float" value="0" />
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<input name="subsurface_color" type="color3" value="0.8, 0.8, 0.8" />
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<input name="subsurface_radius" type="float" value="1.0" />
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<input name="subsurface_radius_scale" type="color3" value="1.0, 0.5, 0.25" />
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<input name="subsurface_scatter_anisotropy" type="float" value="0.0" />
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<input name="fuzz_weight" type="float" value="0.0" />
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<input name="fuzz_color" type="color3" value="1, 1, 1" />
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<input name="fuzz_roughness" type="float" value="0.5" />
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<input name="coat_weight" type="float" value="0.0" />
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<input name="coat_color" type="color3" value="1, 1, 1" />
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<input name="coat_roughness" type="float" value="0.0" />
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<input name="coat_roughness_anisotropy" type="float" value="0.0" />
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<input name="coat_ior" type="float" value="1.6" />
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<input name="coat_darkening" type="float" value="1.0" />
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<input name="thin_film_weight" type="float" value="0" />
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<input name="thin_film_thickness" type="float" value="0.5" />
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<input name="thin_film_ior" type="float" value="1.4" />
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<input name="emission_luminance" type="float" value="0.0" />
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<input name="emission_color" type="color3" value="1, 1, 1" />
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<input name="geometry_opacity" type="float" value="1" />
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<input name="geometry_thin_walled" type="boolean" value="false" />
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<!--Outputs-->
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<output name="base_out" type="float" />
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<output name="base_color_out" type="color3" />
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<output name="diffuse_roughness_out" type="float" />
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<output name="metalness_out" type="float" />
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<output name="specular_out" type="float"/>
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<output name="specular_color_out" type="color3" />
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<output name="specular_roughness_out" type="float" />
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<output name="specular_IOR_out" type="float" />
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<output name="specular_anisotropy_out" type="float" />
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<output name="transmission_out" type="float" />
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<output name="transmission_color_out" type="color3" />
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<output name="transmission_depth_out" type="float" />
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<output name="transmission_scatter_out" type="color3" />
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<output name="transmission_scatter_anisotropy_out" type="float" />
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<output name="transmission_dispersion_out" type="float" />
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<output name="subsurface_out" type="float" />
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<output name="subsurface_color_out" type="color3" />
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<output name="subsurface_radius_out" type="color3" />
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<output name="subsurface_scale_out" type="float" />
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<output name="subsurface_anisotropy_out" type="float" />
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<output name="sheen_out" type="float" />
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<output name="sheen_color_out" type="color3" />
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<output name="sheen_roughness_out" type="float" />
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<output name="coat_out" type="float" />
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<output name="coat_color_out" type="color3" />
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<output name="coat_roughness_out" type="float" />
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<output name="coat_anisotropy_out" type="float" />
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<output name="coat_IOR_out" type="float" />
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<output name="coat_affect_color_out" type="float" />
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<output name="coat_affect_roughness_out" type="float" />
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<output name="thin_film_thickness_out" type="float" />
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<output name="thin_film_IOR_out" type="float" />
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<output name="emission_out" type="float" />
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<output name="emission_color_out" type="color3" />
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<output name="opacity_out" type="color3" />
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<output name="thin_walled_out" type="boolean" />
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</nodedef>
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<nodegraph name="NG_open_pbr_surface_to_standard_surface" nodedef="ND_open_pbr_surface_to_standard_surface">
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<!--Base-->
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<dot name="base" type="float">
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<input name="in" type="float" interfacename="base_weight" />
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</dot>
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<dot name="baseColor" type="color3">
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<input name="in" type="color3" interfacename="base_color" />
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</dot>
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<dot name="diffuseRoughness" type="float">
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<input name="in" type="float" interfacename="base_diffuse_roughness" />
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</dot>
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<dot name="metalness" type="float">
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<input name="in" type="float" interfacename="base_metalness" />
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</dot>
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<!--Specular-->
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<dot name="spec" type="float">
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<input name="in" type="float" interfacename="specular_weight" />
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</dot>
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<dot name="specColor" type="color3">
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<input name="in" type="color3" interfacename="specular_color" />
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</dot>
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<mix name="specRoughness" type="float">
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<input name="fg" type="float" interfacename="coat_roughness" />
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<input name="bg" type="float" interfacename="specular_roughness" />
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<input name="mix" type="float" interfacename="coat_weight" />
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</mix>
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<dot name="specIOR" type="float">
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<input name="in" type="float" interfacename="specular_ior" />
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</dot>
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<!-- logic for anisotropic specular is noticeably different between Standard Surface and OpenPBR, so the translation between these concepts will take more thought-->
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<dot name="specAnisotropy" type="float">
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<input name="in" type="float" interfacename="specular_roughness_anisotropy" />
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</dot>
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<!--Transmission-->
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<dot name="transmission" type="float">
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<input name="in" type="float" interfacename="transmission_weight" />
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</dot>
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<dot name="transmissionColor" type="color3">
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<input name="in" type="color3" interfacename="transmission_color" />
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</dot>
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<dot name="transmissionDepth" type="float">
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<input name="in" type="float" interfacename="transmission_depth" />
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</dot>
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<dot name="transmissionScatter" type="color3">
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<input name="in" type="color3" interfacename="transmission_scatter" />
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</dot>
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<dot name="transmissionScatterAnisotropy" type="float">
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<input name="in" type="float" interfacename="transmission_scatter_anisotropy" />
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</dot>
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<dot name="transmissionDispersion" type="float">
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<input name="in" type="float" interfacename="transmission_dispersion_scale" />
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</dot>
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<!--Subsurface-->
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<dot name="subsurface" type="float">
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<input name="in" type="float" interfacename="subsurface_weight" />
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</dot>
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<dot name="subsurfaceColor" type="color3">
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<input name="in" type="color3" interfacename="subsurface_color" />
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</dot>
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<dot name="subsurfaceScale" type="float">
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<input name="in" type="float" interfacename="subsurface_radius" />
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</dot>
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<dot name="subsurfaceRadius" type="color3">
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<input name="in" type="color3" interfacename="subsurface_radius_scale" />
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</dot>
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<dot name="subsurfaceAnisotropy" type="float">
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<input name="in" type="float" interfacename="subsurface_scatter_anisotropy" />
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</dot>
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<!--Sheen-->
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<dot name="sheen" type="float">
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<input name="in" type="float" interfacename="fuzz_weight" />
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</dot>
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<dot name="sheenColor" type="color3">
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<input name="in" type="color3" interfacename="fuzz_color" />
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</dot>
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<power name="sheenRoughness" type="float">
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<input name="in1" type="float" interfacename="fuzz_roughness" />
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<input name="in2" type="float" value="2.5" />
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</power>
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<!--Coat-->
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<dot name="coat" type="float">
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<input name="in" type="float" interfacename="coat_weight" />
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</dot>
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<dot name="coatColor" type="color3">
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<input name="in" type="color3" interfacename="coat_color" />
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</dot>
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<dot name="coatRoughness" type="float">
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<input name="in" type="float" interfacename="coat_roughness" />
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</dot>
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<dot name="coatAnisotropy" type="float">
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<input name="in" type="float" interfacename="coat_roughness_anisotropy" />
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</dot>
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<dot name="coatIOR" type="float">
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<input name="in" type="float" interfacename="coat_ior" />
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</dot>
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<dot name="coatAffectColor" type="float">
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<input name="in" type="float" interfacename="coat_darkening" />
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</dot>
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<dot name="coatAffectRoughness" type="float">
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<input name="in" type="float" interfacename="coat_darkening" />
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</dot>
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<!--ThinFilm-->
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<multiply name="thinFilmThicknessConversion" type="float">
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<input name="in1" type="float" interfacename="thin_film_thickness" />
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<input name="in2" type="float" value="1000" />
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</multiply>
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<ifgreater name="thinFilmThickness" type="float">
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<input name="value1" type="float" interfacename="thin_film_weight" />
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<input name="value2" type="float" value="0.0" />
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<input name="in1" type="float" nodename="thinFilmThicknessConversion" />
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<input name="in2" type="float" value="0.0" />
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</ifgreater>
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<dot name="thinFilmIOR" type="float">
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<input name="in" type="float" interfacename="thin_film_ior" />
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</dot>
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<!--Emission-->
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<dot name="emission" type="float">
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<input name="in" type="float" interfacename="emission_luminance" />
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</dot>
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<dot name="emissionColor" type="color3">
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<input name="in" type="color3" interfacename="emission_color" />
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</dot>
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<!--Geometry-->
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<convert name="geometryOpacity" type="color3">
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<input name="in" type="float" interfacename="geometry_opacity" />
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</convert>
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<dot name="geometryThinWalled" type="boolean">
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<input name="in" type="boolean" interfacename="geometry_thin_walled" />
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</dot>
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<!--Outputs-->
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<output name="base_out" type="float" nodename="base" />
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<output name="base_color_out" type="color3" nodename="baseColor" />
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<output name="diffuse_roughness_out" type="float" nodename="diffuseRoughness" />
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<output name="metalness_out" type="float" nodename="metalness" />
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<output name="specular_out" type="float" nodename="spec" />
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<output name="specular_color_out" type="color3" nodename="specColor" />
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<output name="specular_roughness_out" type="float" nodename="specRoughness" />
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<output name="specular_IOR_out" type="float" nodename="specIOR" />
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<output name="specular_anisotropy_out" type="float" nodename="specAnisotropy" />
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<output name="transmission_out" type="float" nodename="transmission" />
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<output name="transmission_color_out" type="color3" nodename="transmissionColor" />
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<output name="transmission_depth_out" type="float" nodename="transmissionDepth" />
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<output name="transmission_scatter_out" type="color3" nodename="transmissionScatter" />
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<output name="transmission_scatter_anisotropy_out" type="float" nodename="transmissionScatterAnisotropy" />
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<output name="transmission_dispersion_out" type="float" nodename="transmissionDispersion" />
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<output name="subsurface_out" type="float" nodename="subsurface" />
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<output name="subsurface_color_out" type="color3" nodename="subsurfaceColor" />
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<output name="subsurface_radius_out" type="color3" nodename="subsurfaceRadius" />
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<output name="subsurface_scale_out" type="float" nodename="subsurfaceScale" />
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<output name="subsurface_anisotropy_out" type="float" nodename="subsurfaceAnisotropy" />
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<output name="sheen_out" type="float" nodename="sheen" />
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<output name="sheen_color_out" type="color3" nodename="sheenColor" />
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<output name="sheen_roughness_out" type="float" nodename="sheenRoughness" />
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<output name="coat_out" type="float" nodename="coat" />
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<output name="coat_color_out" type="color3" nodename="coatColor" />
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<output name="coat_roughness_out" type="float" nodename="coatRoughness" />
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<output name="coat_anisotropy_out" type="float" nodename="coatAnisotropy" />
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<output name="coat_IOR_out" type="float" nodename="coatIOR" />
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<output name="coat_affect_color_out" type="float" nodename="coatAffectColor" />
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<output name="coat_affect_roughness_out" type="float" nodename="coatAffectRoughness" />
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<output name="thin_film_thickness_out" type="float" nodename="thinFilmThickness" />
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<output name="thin_film_IOR_out" type="float" nodename="thinFilmIOR" />
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<output name="emission_out" type="float" nodename="emission" />
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<output name="emission_color_out" type="color3" nodename="emissionColor" />
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<output name="opacity_out" type="color3" nodename="geometryOpacity" />
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<output name="thin_walled_out" type="boolean" nodename="geometryThinWalled" />
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</nodegraph>
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</materialx>

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