I'm testing a sample at POV-Ray help (2.3.6  Simple Media Tutorial) that lock
like this:

sphere // transparent sphere containing media
 { 0,.7
   pigment { rgbt 1 } hollow
   interior
   {
     media
     { emission 1
       density
       { spherical density_map
         { [0 rgb 0]
           [0.4 rgb <1,0,0>]
           [0.8 rgb <1,1,0>]
           [1 rgb 1]
         }
       }
     }
   }
   translate <-0.5, 1.7, 0.5>
 }


but the objects exported by Wings3D use "declare" statement to define the object
geometry and "object" to declare and define objects. So, why I can't get the
same result by using this way:

#declare nebulosa = sphere // transparent sphere containing media
 { 0,.7
   translate <0.5, 1.7, 0.5>
 }

object { nebulosa
   pigment { rgbt 1 } hollow
   interior
   {
     media
     { emission 1
       density
       { spherical density_map
         { [0 rgb 0]
           [0.4 rgb <1,0,0>]
           [0.8 rgb <1,1,0>]
           [1 rgb 1]
         }
       }
     }
   }
}

I have just moved the pigment an interior properties from "declare" to "object"
and get this result:
http://lh6.ggpht.com/_ZQYpKPHH8hM/SjLyeInLAbI/AAAAAAAAALA/Cg75pZtO9C8/s720/Teste%20Luz%20Volumetrica.jpg
(observe the intersection insed the "glow" sphere)

TIA

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