WIP gltf_texture_lookup_value to color & float4 nodes

exts/cesium.omniverse/mdl/cesium.mdl

@@ -85,3 +85,13 @@ export gltf_texture_lookup_value cesium_base_color_texture_lookup(*) = gltf_text
 // Copy of the glTF texture lookup shader. Use this instead of cesium_base_color_texture_lookup when loading
 // custom textures to use with cesium_material.
 export gltf_texture_lookup_value cesium_texture_lookup(*) = gltf_texture_lookup();
+
+// Return the texture RGB as a color from a gltf_texture_lookup_value
+export color gltf_texture_lookup_value_to_color(gltf_texture_lookup_value gltf) {
+	return color(gltf.value.x, gltf.value.y, gltf.value.z);
+}
+
+// Return the texture RGB as a float4 from a gltf_texture_lookup_value
+export float4 gltf_texture_lookup_value_to_float4(gltf_texture_lookup_value gltf) {
+	return gltf.value;
+}