A sphere is a surface, nothing else. Objects in povray aren't solid.


  What you probably want is media inside the sphere, like this:

camera { location -z*5 look_at 0 angle 35 }

sphere
{ 0, 1 hollow
  pigment { transmit 1 }
  interior
  { media
    { emission 1
      density
      { spherical density_map
        { [0 rgb 0]
          [1 rgb z]
        }
      }
    }
  }
}


-- 
                                                          - Warp

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