three.js/examples/materialx/heightnormal.mtlx

<?xml version="1.0"?>
<materialx version="1.39">
  <nodegraph name="height_to_normal_example">
    <image name="height_image" type="float">
      <input name="file" type="filename" value="resources/Images/grid.png" />
      <input name="default" type="float" value="0.5" />
    </image>
    <heighttonormal name="height_to_normal" type="vector3">
      <input name="in" type="float" nodename="height_image" />
      <input name="scale" type="float" value="1.0" />
    </heighttonormal>
    <convert name="normal_to_color" type="color3">
      <input name="in" type="vector3" nodename="height_to_normal" />
    </convert>
    <output name="out" type="color3" nodename="normal_to_color" />
  </nodegraph>
  <surfacematerial name="mat_heightnormal" type="material" nodedef="ND_surfacematerial">
    <input name="surfaceshader" type="surfaceshader" nodename="surface_shader1" />
  </surfacematerial>
  <standard_surface name="surface_shader1" type="surfaceshader" nodedef="ND_standard_surface_surfaceshader">
    <input name="base_color" type="color3" output="out" nodegraph="height_to_normal_example" />
  </standard_surface>
</materialx>