> The last bit about the non-linear transformations....
> [...clipped...]
> So to get the new point, take old point and move( change) by formula amount.

I've been thinking about this one, too (non-linear transformations).
It's a difficult problem. It would be easy (relatively) to take a shape
and skew it based on some function. However, I think there would be a
lot of work to also take into account surface normal, textures and
everything else which dictates what an object would look like at a
skewed point. I don't think it is impossible at all, just a very tricky
and uncomfortable problem. I sure ain't the guy to take on that one!

jb

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