> My instinct would be to avoid the analysis approach, and do sampling
> on the original function.  That doesn't take a lot of sophisticated
> math.  I can't even remember the chain rule without looking it up
> (and the last time I did so was, like, 2005), but I have used
> sampling to estimate normals on a form based on parametric functions.
> I did this for the smooth triangles of the elliptical toroids in
> RoundEdge.  Normals, of course, can be easily converted to slopes.
>

   I'm still trying to grasp the concept of "sampling a function"... how
I would do that? With another function? If someone can please post a
simple example...

--
jaime

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