web.45e6ccb2e5bdf9d1be7bfb550@news.povray.org...
>
> Thanks Warp
> Yeah, you are completely right. I have just done what you recommend using 
> a
> sphere instead of a mesh, and the mesh doesnt seem to be the problem. It
> should be the position of both camera and lights.
>
Are you sure you've put the keyword 'hollow' in your object definition?
Media can only be computed in a hollow object

Marc

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