Folkert van Heusden wrote:
> Hi,
> 
> Would it be possible to somehow create fog-in-a-box?

Yes, it is indeed possible, and you will get effects unlike those which 
  media or attenuation produce. This code works:

//**********************
fog{rgb 1 distance 4 }

box{<-5,-4,-5>,<5,4,5>
  pigment{rgbt 1}
  inverse
  rotate y*25
}
//**********************

If you want fog in the rest of your scene, some complex csg operations 
will be needed.

Hope it helps~

~Sam

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