Did this mostly to learn how to do a transparent dome... this effort used:

 difference {

    sphere { <0,0,0>, 1
       texture{ pigment{ rgbf <0.98, 0.98, 0.98, 0.9> }
       finish { ambient 0.1 diffuse 0.1 reflection 0.2
       specular 0.8 roughness 0.0003 phong 1 phong_size 400}
               } // end of texture

          scale<130,70,130>  rotate<0,0,0>  translate<0,0,0>
       }  // end of sphere -----------------------------------

        sphere { <0,0,0>, .999
           texture{ pigment{ rgbf <0.98, 0.98, 0.98, 0.9> }
           finish { ambient 0.1 diffuse 0.1 reflection 0.2
           specular 0.8 roughness 0.0003 phong 1 phong_size 400}
               } // end of texture

          scale<130,70,130>  rotate<0,0,0>  translate<0,0,0>
       }  // end of sphere -----------------
}

(with radiosity)

--Ralph

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