<World>
   <Camera eye="0, 0, 10" look_at="0,0,0" fov="30" />

   <ShaderGroup>
      shader envmap layer1;
   </ShaderGroup>
   <Background resolution="1024" />

   <ShaderGroup>
      param float scale_s 20;
      param float scale_t 20;
      param color Ca 0.1 0.1 0.1;
      param color Cb 0.5 0.5 0.5;
      shader checkerboard tex;
      param float roughness 0.0;
      shader matte layer1;
      connect tex.Cout layer1.Cs;
   </ShaderGroup>
   <Sphere center="-0.8,0,0" radius="0.75" />   

   <ShaderGroup>
      param float scale_s 20;
      param float scale_t 20;
      param color Cb 0.1 0.1 0.1;
      param color Ca 0.5 0.5 0.5;
      shader checkerboard tex;
      param float roughness 1.0;
      shader matte layer1;
      connect tex.Cout layer1.Cs;
   </ShaderGroup>
   <Sphere center="0.8,0,0" radius="0.75" />   
</World>
