Am 19.05.2012 05:04, schrieb Thomas A. Fine:

> #declare redgloss = texture { pigment { color rgb<1,0,0>  } finish { ambient 0.1
specular 0.5 diffuse 0.5 reflection 0.1 } }

Did you try without the reflection?

If that helps, try adding

   sphere { <0,0,0> 100000
     texture {
       pigment { color rgb 0 }
     }
     finish { ambient 0 specular 0 diffuse 0 }
     no_image
   }

It might be that reflections of a transparent background produce weird 
results; by enveloping the scene in a huge black sphere we provide 
something opaque to reflect, and the "no_image" statement makes sure the 
image itself still shows the background.

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