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

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

   <ShaderGroup>
      param color Cr 0.8 0.4 0.2;
      float roughness 0.2;
      float anisotropy 0.0;
      shader glossy layer1;
   </ShaderGroup>
   <Sphere center="-1.1,0,0" radius="0.5" />

   <ShaderGroup>
      float roughness 0.5;
      float anisotropy 0.5;
      float ior 1.8;
      shader glossy layer1;
   </ShaderGroup>
   <Sphere center="0.0,0,0" radius="0.5" />

   <ShaderGroup>
      float roughness 0.8;
      float anisotropy 0.25;
      float ior 3.0;
      shader glossy layer1;
   </ShaderGroup>
   <Sphere center="1.1,0,0" radius="0.5" />
</World>
