Qt Quick 3D - Custom Instanced Rendering

 VARYING vec4 vCustomData;
 VARYING vec3 vGlobalPosition;

 void MAIN()
 {
     METALNESS = 0.0;
     ROUGHNESS = 1.0;
     FRESNEL_POWER = 5.0;

     float c;

     if (vCustomData.x > 0)
         c = 1.0 - (1.0 + sin(sqrt(vGlobalPosition.x*vGlobalPosition.x + vGlobalPosition.z*vGlobalPosition.z) - uTime/200.0)) * 0.2;
     else
         c = 1.0 - 0.25 * (UV0.x*UV0.x + UV0.y*UV0.y);

     BASE_COLOR = vec4(c, c, c, 1.0);
 }