<World>
   <Camera eye="0, 0, 10" look_at="0,0,0" fov="4.2" />

   <ShaderGroup>
      shader envmap layer1;
   </ShaderGroup>
   <Background resolution="1" />

   <ShaderGroup>
      param float roughness 0.0;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="-1.0,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.1;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="-0.8,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.2;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="-0.6,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.3;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="-0.4,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.4;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="-0.2,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.5;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="0,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.6;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="0.2,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.7;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="0.4,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.8;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="0.6,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 0.9;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="0.8,0,0" radius="0.08" />
   <ShaderGroup>
      param float roughness 1.0;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="1.0,0,0" radius="0.08" />
</World>
