On 6-8-2018 19:43, Mike Horvath wrote:
> I think it did have something to do with scale. The problem went away, 
> but don't know how or why.
> 

That is probably true. To avoid confusion, I generally scale the 
container at the end, e.g.:

sphere {
   0, 1
   hollow
   material {
     texture {
       pigment {rgbt 1}
     }
     interior {
       media {
         emission 10/MyScale
         scattering 3/MyScale
         density {
           spherical
           density_map {MyMap}
         }
       }
     }
   }
   scale MyScale
}

-- 
Thomas

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