> // Dust
> box {
>    <-4.999, -0.499, -4.999>,
>    <  4.999,  0.499,  0.499>
>    pigment { rgbt 1 }
>    hollow
>    interior {
>      media {
>        intervals 20
>        scattering {
>          2, rgb 0.1
>        }
>      }
>    }
> }
>

Unrelated to your problem, but you should NOT use intervals 20.
Much, much beter to leave it to it's default value of 1 and set samples 
instead.
You'll see that for the same final number of samples, the rendering 
speed get much beter.


Alain

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