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

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

   <ShaderGroup>
      param color F0  0.2 0.4 0.6;
      param color F90 0.9 0.7 0.3;
      float roughness 0.2;
      shader glossy layer1;
   </ShaderGroup>
   <Sphere center="-1.1,0,0" radius="0.5" />

   <ShaderGroup>
      param color F0  0.0 1.0 0.2;
      param color F90 1.0 0.2 0.1;
      param float exponent 3;
      float roughness 0.5;
      shader glossy layer1;
   </ShaderGroup>
   <Sphere center="0.0,0,0" radius="0.5" />

   <ShaderGroup>
      param color F0  1.0 0.5 0.25;
      param color F90 0.25 0.5 1.0;
      float roughness 1.0;
      float exponent 1.0;
      shader glossy layer1;
   </ShaderGroup>
   <Sphere center="1.1,0,0" radius="0.5" />
</World>
