Tor Olav Kristensen wrote:
> 
> [...]
> 
> But then POV-Ray would need to examine the
> vector function in order to make sure that
> it does not represent a non-linear trans-
> formation.
> 
> And if it is only allowed to be a linear
> transformation, then I think that it will
> only be useful within isosurfaces, pigments
> and maybe patterns.
> 
> I suspect that this would not allow for new
> types of transformations. It would only make
> it easier to do certain transformation (that
> are already possible today).
> 
> Or am I wrong about all this ?

I have no idea what you are talking about.  A transform can always be seen
as a function -  you put in a vector and get out a vector.  Nothing
prevents you to use an arbitrary vector function for that and not just a
transformation matrix.  There might of course be problems when calculation
of the bounding box or similar things imply transformations being linear.

Christoph

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