in news:41dfc3b8@news.povray.org Warp wrote:

>   Unless you can apply the non-linear transformation on a per-object
> basis (so that its shadow and its reflection/refraction on other
> objects etc are also transformed correctly), the effect is rather
> useless (except for making some abstract art).

Usefull or not, the interesthing thing is that it is done and that it is 
done using POV-Ray. In the paper he also discusses non-linear 
transformation on per object basis.
 
>   Also, I would like to know whether the rays used to render those
>   images  were really curved or [...]

The paper on the site describes how it's done. 

So far, I havn't found the source, if it's onlne at all, although the 
paper suggests it.

Ingo

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