Thanks for your help Mike. It is much appreciated. That was just the
effect I was after.

Mark

Michael Andrews wrote:
> 
> Hi Mark,
>     I've posted an image and pov source on p.b.images that is my best guess
> at a direct translation from atmosphere to media, although I have put the
> media in a box so it is more like an old scattering halo I guess.
> 
>     Bye for now,
>         Mike Andrews.

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