<World>
   <Camera eye="0, 250, 400" look_at="0,0,0" fov="40" />

   <ShaderGroup>
      shader uv layer1;
   </ShaderGroup>
   <Sphere center="-60,30,60"        radius="30" />
   <ShaderGroup>
      float sigma 0.3;
      color Cs 0.2 0.7 0.2;
      shader matte layer1;
   </ShaderGroup>
   <Sphere center="  0,30,60"        radius="30" />
   <ShaderGroup>
      string filename "../common/textures/grid.tx";
      shader tex_matte layer1;
   </ShaderGroup>
   <Sphere center=" 60,30,60"        radius="30" />

   <ShaderGroup>float power 160000; shader emitter layer1;</ShaderGroup>
   <Sphere center="-120, 130, 250" radius="1" is_light="yes" /> <!--Lite -->
   
</World>
