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"Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmail com> wrote:
> Yes, that is possible. Just create 3 bivariate functions with the appropriate
> Bernstein polynomials and feed them to the parametric object. But you need
> patience for that...
Pffft. Then forget it. None of us Povvers have any patience for that kind of
thing..
We want the instant gratification of hand-coding 1776 lines of SDL that hands us
that first frame of a 3600-frame animation by the very next day!
> > Then, given a point <m, n> (or <u, v>) on the surface, one could place things ON
> > the surface of the patch.
>
> Yes, this image shows some white spheres and cylinders following a path in the
> UV-space on the surface of a NURBS-patch:
>
> http://dataduppedings.no/subcube/POV-Ray_Images/NURBS_Grid.jpg
Right - I've admired that one also.
I haven't yet gotten to coding any NURBS objects - but I'm sure it's an
inevitability ;)
> See also the attached image where the I've put some sphere sweeps on a Bezier
> patch. (Notice that you can read out the radii for the sphere swept curves
> (0.06, 0.46 and 0.48) in the UV-mapped texture.)
Yes - that's a neat trick. I can already see the 2 rotating sets of rolling
spheres in a bowl-shaped Bezier patch, oscillating in simple harmonic motion.
Very nice images as always - you surely have some great macros worked out in
order to be able to make all these "custom" renders in short order.
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