Tor Olav Kristensen wrote:
> 
> [...]
> 
> Then we are talking about exactly the same thing.
> 
> You said that a vector function transformation should
> not be able to deform a box; such a transformation of
> a box should always result in a box. From this I
> reasoned that this would mean that that transformation
> step would be linear.(*)
> 

Well, i think in fact you are right but the reason is somewhat different -
a function based transform would be somewhat difficult to invert and
transforming objects requires the inverse transform...

You could of course transform at least some objects directly and not by
transforming the ray instead like it is currently done but this would be a
completely different thing.

Christoph

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