usd_preview_surface.mtlx

<?xml version="1.0"?>
<materialx version="1.39">

  <!-- ======================================================================== -->
  <!-- USD Preview Surface node definitions                                     -->
  <!-- ======================================================================== -->

  <!-- Node: UsdPreviewSurface -->
  <nodedef name="ND_UsdPreviewSurface_surfaceshader" node="UsdPreviewSurface" nodegroup="pbr" doc="UsdPreviewSurface shader" version="2.6" isdefaultversion="true">
    <input name="diffuseColor" type="color3" value="0.18, 0.18, 0.18" uimin="0,0,0" uimax="1,1,1" uiname="Diffuse Color" />
    <input name="emissiveColor" type="color3" value="0, 0, 0" uimin="0,0,0" uisoftmax="1,1,1" uiname="Emissive Color" />
    <input name="useSpecularWorkflow" type="integer" value="0" uimin="0" uimax="1" uistep="1" uiname="Use Specular Workflow" />
    <input name="specularColor" type="color3" value="0, 0, 0" uimin="0,0,0" uimax="1,1,1" uiname="Specular Color" />
    <input name="metallic" type="float" value="0" uimin="0.0" uimax="1.0" uiname="Metallic" />
    <input name="roughness" type="float" value="0.5" uimin="0.0" uimax="1.0" uiname="Roughness" />
    <input name="clearcoat" type="float" value="0" uimin="0.0" uimax="1.0" uiname="Clearcoat" />
    <input name="clearcoatRoughness" type="float" value="0.01" uimin="0.0" uimax="1.0" uiname="Clearcoat Roughness" />
    <input name="opacity" type="float" value="1" uimin="0.0" uimax="1.0" uiname="Opacity" />
    <input name="opacityMode" type="integer" enum="transparent,presence" enumvalues="0,1" value="0" uiname="Opacity Mode" />
    <input name="opacityThreshold" type="float" value="0" uimin="0.0" uimax="1.0" uiname="Opacity Threshold" />
    <input name="ior" type="float" value="1.5" uimin="0.0" uisoftmin="1.0" uisoftmax="3.0" uiname="Index of Refraction" />
    <input name="normal" type="vector3" value="0, 0, 1" uimin="-1.0,-1.0,-1.0" uimax="1.0,1.0,1.0" uistep="0.01" uiname="Normal" />
    <input name="displacement" type="float" value="0" uiname="Displacement" />
    <input name="occlusion" type="float" value="1" uimin="0.0" uimax="1.0" uiname="Occlusion" />
    <output name="out" type="surfaceshader" />
  </nodedef>

  <!-- Node: UsdUVTexture -->
  <nodedef name="ND_UsdUVTexture" node="UsdUVTexture" nodegroup="texture2d" version="2.2" inherit="ND_UsdUVTexture_23">
    <output name="r" type="float" />
    <output name="g" type="float" />
    <output name="b" type="float" />
    <output name="a" type="float" />
    <output name="rgb" type="color3" />
    <output name="rgba" type="color4" />
  </nodedef>

  <nodedef name="ND_UsdUVTexture_23" node="UsdUVTexture" nodegroup="texture2d" version="2.3" isdefaultversion="true">
    <input name="file" type="filename" value="" uniform="true" />
    <input name="st" type="vector2" defaultgeomprop="UV0" />
    <input name="wrapS" type="string" value="periodic" enum="black,clamp,periodic,mirror" uniform="true" />
    <input name="wrapT" type="string" value="periodic" enum="black,clamp,periodic,mirror" uniform="true" />
    <input name="fallback" type="color4" value="0, 0, 0, 1" />
    <input name="scale" type="color4" value="1, 1, 1, 1" uniform="true" />
    <input name="bias" type="color4" value="0, 0, 0, 0" uniform="true" />
    <output name="r" type="float" />
    <output name="g" type="float" />
    <output name="b" type="float" />
    <output name="a" type="float" />
    <output name="rgb" type="color3" />
  </nodedef>

  <!-- Node: UsdPrimvarReader -->
  <nodedef name="ND_UsdPrimvarReader_integer" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="integer" value="0" />
    <output name="out" type="integer" />
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_boolean" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="boolean" value="false" />
    <output name="out" type="boolean" />
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_string" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="string" value="" uniform="true" />
    <output name="out" type="string" uniform="true"/>
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_filename" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="filename" value="" uniform="true" />
    <output name="out" type="filename" uniform="true"/>
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_float" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="float" value="0" />
    <output name="out" type="float" />
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_vector2" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="vector2" value="0, 0" />
    <output name="out" type="vector2" />
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_vector3" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="vector3" value="0, 0, 0" />
    <output name="out" type="vector3" />
  </nodedef>
  <nodedef name="ND_UsdPrimvarReader_vector4" nodegroup="geometric" node="UsdPrimvarReader">
    <input name="varname" type="string" value="" uniform="true" />
    <input name="fallback" type="vector4" value="0, 0, 0, 0" />
    <output name="out" type="vector4" />
  </nodedef>
  <!-- TODO: Getting primvar of matrix type is not supported in MaterialX standard library.
  <nodedef name="ND_UsdPrimvarReader_matrix44" node="UsdPrimvarReader">
    <input name="varname" type="string" />
    <input name="fallback" type="matrix44" value="1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1" />
    <output name="out" type="matrix44" />
  </nodedef>
  -->

  <!-- Node: UsdTransform2d -->
  <nodedef name="ND_UsdTransform2d" nodegroup="math" node="UsdTransform2d">
    <input name="in" type="vector2" value="0, 0" />
    <input name="rotation" type="float" value="0" />
    <input name="scale" type="vector2" value="1, 1" />
    <input name="translation" type="vector2" value="0, 0" />
    <output name="out" type="vector2" />
  </nodedef>

  <!-- ======================================================================== -->
  <!-- USD Preview Surface nodegraph implementations                            -->
  <!-- ======================================================================== -->

  <!-- Node: UsdPreviewSurface -->
  <nodegraph name="IMP_UsdPreviewSurface_surfaceshader" nodedef="ND_UsdPreviewSurface_surfaceshader">

    <convert name="use_specular_workflow_float" type="float">
      <input name="in" type="integer" interfacename="useSpecularWorkflow" />
    </convert>

    <!-- Compute the surface normal -->
    <multiply name="scale_normal" type="vector3">
      <input name="in1" type="vector3" interfacename="normal" />
      <input name="in2" type="float" value="0.5" />
    </multiply>
    <add name="bias_normal" type="vector3">
      <input name="in1" type="vector3" nodename="scale_normal" />
      <input name="in2" type="float" value="0.5" />
    </add>
    <normalmap name="surface_normal" type="vector3">
      <input name="in" type="vector3" nodename="bias_normal" />
    </normalmap>

    <!-- Diffuse Layer -->
    <subtract name="inverse_metalness" type="float">
      <input name="in1" type="float" value="1" />
      <input name="in2" type="float" interfacename="metallic" />
    </subtract>
    <mix name="diffuse_bsdf_weight" type="float">
      <input name="fg" type="float" value="1.0" />
      <input name="bg" type="float" nodename="inverse_metalness" />
      <input name="mix" type="float" nodename="use_specular_workflow_float" />
    </mix>
    <oren_nayar_diffuse_bsdf name="diffuse_bsdf" type="BSDF">
      <input name="weight" type="float" nodename="diffuse_bsdf_weight" />
      <input name="color" type="color3" interfacename="diffuseColor" />
      <input name="roughness" type="float" value="0" />
      <input name="normal" type="vector3" nodename="surface_normal" />
    </oren_nayar_diffuse_bsdf>

    <!-- Transmission Layer -->
    <dielectric_bsdf name="transmission_bsdf" type="BSDF">
      <input name="weight" type="float" value="1" />
      <input name="tint" type="color3" value="1, 1, 1" />
      <input name="ior" type="float" interfacename="ior" />
      <input name="roughness" type="vector2" value="0.0, 0.0" />
      <input name="normal" type="vector3" nodename="surface_normal" />
      <input name="scatter_mode" type="string" value="T" />
    </dielectric_bsdf>
    <ifgreater name="transmission_mix_amount" type="float">
      <input name="value1" type="float" interfacename="opacityThreshold" />
      <input name="value2" type="float" value="0" />
      <input name="in1" type="float" value="1" />
      <input name="in2" type="float" interfacename="opacity" />
    </ifgreater>
    <mix name="transmission_mix" type="BSDF">
      <input name="fg" type="BSDF" nodename="diffuse_bsdf" />
      <input name="bg" type="BSDF" nodename="transmission_bsdf" />
      <input name="mix" type="float" nodename="transmission_mix_amount" />
    </mix>

    <!-- Specular Workflow -->
    <roughness_anisotropy name="specular_roughness" type="vector2">
      <input name="roughness" type="float" interfacename="roughness" />
      <input name="anisotropy" type="float" value="0" />
    </roughness_anisotropy>
    <generalized_schlick_bsdf name="specular_bsdf1" type="BSDF">
      <input name="weight" type="float" value="1" />
      <input name="color0" type="color3" interfacename="specularColor" />
      <input name="color90" type="color3" value="1, 1, 1" />
      <input name="roughness" type="vector2" nodename="specular_roughness" />
      <input name="normal" type="vector3" nodename="surface_normal" />
    </generalized_schlick_bsdf>
    <layer name="specular_workflow_bsdf" type="BSDF">
      <input name="top" type="BSDF" nodename="specular_bsdf1" />
      <input name="base" type="BSDF" nodename="transmission_mix" />
    </layer>

    <!-- Metalness Workflow -->
    <subtract name="one_minus_ior" type="float">
      <input name="in1" type="float" value="1" />
      <input name="in2" type="float" interfacename="ior" />
    </subtract>
    <add name="one_plus_ior" type="float">
      <input name="in1" type="float" value="1" />
      <input name="in2" type="float" interfacename="ior" />
    </add>
    <divide name="R" type="float">
      <input name="in1" type="float" nodename="one_minus_ior" />
      <input name="in2" type="float" nodename="one_plus_ior" />
    </divide>
    <multiply name="R_sq" type="float">
      <input name="in1" type="float" nodename="R" />
      <input name="in2" type="float" nodename="R" />
    </multiply>
    <mix name="specular_color_metallic" type="color3">
      <input name="fg" type="color3" interfacename="diffuseColor" />
      <input name="bg" type="color3" value="1, 1, 1" />
      <input name="mix" type="float" interfacename="metallic" />
    </mix>
    <multiply name="specular_color_metallic_R_sq" type="color3">
      <input name="in1" type="color3" nodename="specular_color_metallic" />
      <input name="in2" type="float" nodename="R_sq" />
    </multiply>
    <mix name="F0" type="color3">
      <input name="fg" type="color3" nodename="specular_color_metallic" />
      <input name="bg" type="color3" nodename="specular_color_metallic_R_sq" />
      <input name="mix" type="float" interfacename="metallic" />
    </mix>
    <generalized_schlick_bsdf name="specular_bsdf2" type="BSDF">
      <input name="weight" type="float" value="1" />
      <input name="color0" type="color3" nodename="F0" />
      <input name="color90" type="color3" nodename="specular_color_metallic" />
      <input name="roughness" type="vector2" nodename="specular_roughness" />
      <input name="normal" type="vector3" nodename="surface_normal" />
    </generalized_schlick_bsdf>
    <layer name="metalness_specular_bsdf" type="BSDF">
      <input name="top" type="BSDF" nodename="specular_bsdf2" />
      <input name="base" type="BSDF" nodename="transmission_mix" />
    </layer>
    <artistic_ior name="artistic_ior" type="multioutput">
      <input name="reflectivity" type="color3" interfacename="diffuseColor" />
      <input name="edge_color" type="color3" interfacename="diffuseColor" />
    </artistic_ior>
    <conductor_bsdf name="metalness_metal_bsdf" type="BSDF">
      <input name="weight" type="float" value="1" />
      <input name="ior" type="color3" nodename="artistic_ior" output="ior" />
      <input name="extinction" type="color3" nodename="artistic_ior" output="extinction" />
      <input name="roughness" type="vector2" nodename="specular_roughness" />
      <input name="normal" type="vector3" nodename="surface_normal" />
    </conductor_bsdf>
    <mix name="metalness_workflow_bsdf" type="BSDF">
      <input name="fg" type="BSDF" nodename="metalness_metal_bsdf" />
      <input name="bg" type="BSDF" nodename="metalness_specular_bsdf" />
      <input name="mix" type="float" interfacename="metallic" />
    </mix>

    <!-- Select Specular/Metalness workflow -->
    <mix name="workflow_selector_bsdf" type="BSDF">
      <input name="fg" type="BSDF" nodename="specular_workflow_bsdf" />
      <input name="bg" type="BSDF" nodename="metalness_workflow_bsdf" />
      <input name="mix" type="float" nodename="use_specular_workflow_float" />
    </mix>

    <!-- Clearcoat Layer -->
    <roughness_anisotropy name="coat_roughness" type="vector2">
      <input name="roughness" type="float" interfacename="clearcoatRoughness" />
      <input name="anisotropy" type="float" value="0" />
    </roughness_anisotropy>
    <convert name="coat_F0" type="color3">
      <input name="in" type="float" nodename="R_sq" />
    </convert>
    <generalized_schlick_bsdf name="coat_dielectric_bsdf" type="BSDF">
      <input name="weight" type="float" interfacename="clearcoat" />
      <input name="color0" type="color3" nodename="coat_F0" />
      <input name="color90" type="color3" value="1, 1, 1" />
      <input name="roughness" type="vector2" nodename="coat_roughness" />
      <input name="normal" type="vector3" nodename="surface_normal" />
    </generalized_schlick_bsdf>
    <layer name="coat_bsdf" type="BSDF">
      <input name="top" type="BSDF" nodename="coat_dielectric_bsdf" />
      <input name="base" type="BSDF" nodename="workflow_selector_bsdf" />
    </layer>

    <!-- Emission Layer -->
    <uniform_edf name="emission_edf" type="EDF">
      <input name="color" type="color3" interfacename="emissiveColor" />
    </uniform_edf>

    <!-- Surface Shader Constructor -->
    <ifgreatereq name="cutout_opacity" type="float">
      <input name="value1" type="float" interfacename="opacity" />
      <input name="value2" type="float" interfacename="opacityThreshold" />
      <input name="in1" type="float" value="1" />
      <input name="in2" type="float" value="0" />
    </ifgreatereq>
    <ifequal name="opacity_presence" type="float">
      <input name="value1" type="float" interfacename="opacity" />
      <input name="value2" type="float" value="0.0" />
      <input name="in1" type="float" value="0.0" />
      <input name="in2" type="float" nodename="cutout_opacity" />
    </ifequal>
    <switch name="opacity_switch" type="float">
      <input name="in1" type="float" nodename="cutout_opacity" />
      <input name="in2" type="float" nodename="opacity_presence" />
      <input name="which" type="integer" interfacename="opacityMode" />
    </switch>
    <surface name="surface_constructor" type="surfaceshader">
      <input name="bsdf" type="BSDF" nodename="coat_bsdf" />
      <input name="edf" type="EDF" nodename="emission_edf" />
      <input name="opacity" type="float" nodename="opacity_switch" />
    </surface>

    <!-- Output -->
    <output name="out" type="surfaceshader" nodename="surface_constructor" />
  </nodegraph>

  <!-- Node: UsdUVTexture -->
  <nodegraph name="IMP_UsdUVTexture_22" nodedef="ND_UsdUVTexture">
    <image name="image_reader" type="color4">
      <input name="file" type="filename" interfacename="file" />
      <input name="default" type="color4" interfacename="fallback" />
      <input name="texcoord" type="vector2" interfacename="st" />
      <input name="uaddressmode" type="string" interfacename="wrapS" />
      <input name="vaddressmode" type="string" interfacename="wrapT" />
    </image>
    <multiply name="image_scale" type="color4">
      <input name="in1" type="color4" nodename="image_reader" />
      <input name="in2" type="color4" interfacename="scale" />
    </multiply>
    <add name="image_bias" type="color4">
      <input name="in1" type="color4" nodename="image_scale" />
      <input name="in2" type="color4" interfacename="bias" />
    </add>
    <separate4 name="image_bias_separate" type="multioutput">
      <input name="in" type="color4" nodename="image_bias" />
    </separate4>
    <convert name="image_bias_color3" type="color3">
      <input name="in" type="color4" nodename="image_bias" />
    </convert>
    <output name="r" type="float" nodename="image_bias_separate" output="outr" />
    <output name="g" type="float" nodename="image_bias_separate" output="outg" />
    <output name="b" type="float" nodename="image_bias_separate" output="outb" />
    <output name="a" type="float" nodename="image_bias_separate" output="outa" />
    <output name="rgb" type="color3" nodename="image_bias_color3" />
    <output name="rgba" type="color4" nodename="image_bias" />
  </nodegraph>

  <nodegraph name="IMP_UsdUVTexture_23" nodedef="ND_UsdUVTexture_23">
    <image name="image_reader" type="color4">
      <input name="file" type="filename" interfacename="file" />
      <input name="default" type="color4" interfacename="fallback" />
      <input name="texcoord" type="vector2" interfacename="st" />
      <input name="uaddressmode" type="string" interfacename="wrapS" />
      <input name="vaddressmode" type="string" interfacename="wrapT" />
    </image>
    <multiply name="image_scale" type="color4">
      <input name="in1" type="color4" nodename="image_reader" />
      <input name="in2" type="color4" interfacename="scale" />
    </multiply>
    <add name="image_bias" type="color4">
      <input name="in1" type="color4" nodename="image_scale" />
      <input name="in2" type="color4" interfacename="bias" />
    </add>
    <separate4 name="image_bias_separate" type="multioutput">
      <input name="in" type="color4" nodename="image_bias" />
    </separate4>
    <convert name="image_bias_color3" type="color3">
      <input name="in" type="color4" nodename="image_bias" />
    </convert>
    <output name="r" type="float" nodename="image_bias_separate" output="outr" />
    <output name="g" type="float" nodename="image_bias_separate" output="outg" />
    <output name="b" type="float" nodename="image_bias_separate" output="outb" />
    <output name="a" type="float" nodename="image_bias_separate" output="outa" />
    <output name="rgb" type="color3" nodename="image_bias_color3" />
  </nodegraph>

  <!-- Node: UsdPrimvarReader -->
  <nodegraph name="IMP_UsdPrimvarReader_integer" nodedef="ND_UsdPrimvarReader_integer">
    <geompropvalue name="primvar" type="integer">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="integer" interfacename="fallback" />
    </geompropvalue>
    <output name="out" type="integer" nodename="primvar" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_boolean" nodedef="ND_UsdPrimvarReader_boolean">
    <geompropvalue name="primvar" type="boolean">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="boolean" interfacename="fallback" />
    </geompropvalue>
    <output name="out" type="boolean" nodename="primvar" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_string" nodedef="ND_UsdPrimvarReader_string">
    <geompropvalueuniform name="primvar" type="string">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="string" interfacename="fallback" />
    </geompropvalueuniform>
    <output name="out" type="string" nodename="primvar" uniform="true" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_filename" nodedef="ND_UsdPrimvarReader_filename">
    <geompropvalueuniform name="primvar" type="filename">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="filename" interfacename="fallback" />
    </geompropvalueuniform>
    <output name="out" type="filename" nodename="primvar" uniform="true" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_float" nodedef="ND_UsdPrimvarReader_float">
    <geompropvalue name="primvar" type="float">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="float" interfacename="fallback" />
    </geompropvalue>
    <output name="out" type="float" nodename="primvar" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_vector2" nodedef="ND_UsdPrimvarReader_vector2">
    <geompropvalue name="primvar" type="vector2">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="vector2" interfacename="fallback" />
    </geompropvalue>
    <output name="out" type="vector2" nodename="primvar" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_vector3" nodedef="ND_UsdPrimvarReader_vector3">
    <geompropvalue name="primvar" type="vector3">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="vector3" interfacename="fallback" />
    </geompropvalue>
    <output name="out" type="vector3" nodename="primvar" />
  </nodegraph>
  <nodegraph name="IMP_UsdPrimvarReader_vector4" nodedef="ND_UsdPrimvarReader_vector4">
    <geompropvalue name="primvar" type="vector4">
      <input name="geomprop" type="string" interfacename="varname" />
      <input name="default" type="vector4" interfacename="fallback" />
    </geompropvalue>
    <output name="out" type="vector4" nodename="primvar" />
  </nodegraph>

  <!-- Node: UsdTransform2d -->
  <nodegraph name="IMP_UsdTransform2d" nodedef="ND_UsdTransform2d">
    <place2d name="placement" type="vector2">
      <input name="texcoord" type="vector2" interfacename="in" />
      <input name="scale" type="vector2" interfacename="scale" />
      <input name="rotate" type="float" interfacename="rotation" />
      <input name="offset" type="vector2" interfacename="translation" />
    </place2d>
    <output name="out" type="vector2" nodename="placement" />
  </nodegraph>

</materialx>