Hi James:

   The problem is that you are creating the sphere at your desired location
<0,0,10>, but the spherical pattern is at <0,0,0>. Just change the sphere
like the following and it will work:

//-----------------------------------
sphere {
     <0, 0, 0>, 1
texture {pigment{ Clear}}

     interior{
media{method 3

scattering{4,White}
density {spherical density_map
          { [0 rgb .01]
            [0.4 rgb <1,0,0>]
            [0.8 rgb <1,1,0>]
            [1 rgb 1]
          }

}
}
}
     hollow
     scale 2
     translate <0,0,10>
   }
//-----------------------------------


   Regards,


-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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