Update example material

resources/Materials/Examples/npr/gooch_material.mtlx

@@ -0,0 +1,53 @@
+<?xml version="1.0"?>
+<materialx version="1.38" colorspace="lin_rec709" fileprefix="../../../Images/">
+  <nodegraph name="NG_brass1">
+    <tiledimage name="image_color" type="color3">
+      <input name="file" type="filename" value="brass_color.jpg" colorspace="srgb_texture" />
+      <input name="uvtiling" type="vector2" value="1.0, 1.0" />
+    </tiledimage>
+    <tiledimage name="image_roughness" type="float">
+      <input name="file" type="filename" value="brass_roughness.jpg" />
+      <input name="uvtiling" type="vector2" value="1.0, 1.0" />
+    </tiledimage>
+
+    <gooch name="gooch1" type="color3">
+     <input name="Warm" type="color3" value="0.6, 0, 0"/>
+     <input name="Cool" type="color3"  value="0, 0, 0.6"/>
+     <input name="LightDirection" type="vector3" value="0, 1, 1"/>
+     <input name="SpecularColor" type="color3" value="0.8, 0.8, 0.8"/>
+   </gooch>
+
+    <output name="out_basecolor" type="color3" nodename="gooch1" />
+    <output name="out_color" type="color3" nodename="image_color" />
+    <output name="out_roughness" type="float" nodename="image_roughness" />
+  </nodegraph>
+
+  <standard_surface name="SR_brass1" type="surfaceshader">
+    <input name="base" type="float" value="1" />
+    <input name="base_color" type="color3" nodegraph="NG_brass1" output="out_basecolor" />
+    <input name="specular" type="float" value="0" />
+    <input name="specular_roughness" type="float" nodegraph="NG_brass1" output="out_roughness" />
+    <input name="metalness" type="float" value="1" />
+    <input name="coat" type="float" value="1" />
+    <input name="coat_color" type="color3" nodegraph="NG_brass1" output="out_color" />
+    <input name="coat_roughness" type="float" nodegraph="NG_brass1" output="out_roughness" />
+  </standard_surface>
+  <surfacematerial name="Tiled_Brass" type="material">
+    <input name="surfaceshader" type="surfaceshader" nodename="SR_brass1" />
+  </surfacematerial>
+
+  <gooch name="gooch_color" type="color3">
+    <input name="Warm" type="color3" value="0.6, 0, 0" />
+    <input name="Cool" type="color3" value="0, 0, 0.6" />
+    <input name="LightDirection" type="vector3" value="0, 1, 1"/>
+    <input name="SpecularColor" type="color3" value="0.8, 0.8, 0.8"/>
+  </gooch>
+  <surface_unlit name="unlit_surface" type="surfaceshader">
+    <input name="emission_color" type="color3" nodename="gooch_color" />
+    <input name="opacity" type="float" value="1.0" />
+  </surface_unlit>
+  <surfacematerial name="goochmaterial" type="material">
+    <input name="surfaceshader" type="surfaceshader" nodename="unlit_surface" />
+    <input name="displacementshader" type="displacementshader" value="" />
+  </surfacematerial>
+</materialx>