"Dave Matthews" <ns### [at] nospamedu> wrote in message
news:42321bc0@news.povray.org...
> KnotPlot (http://www.pims.math.ca/knotplot/) exports to POVRay in
> bicubic patches, but I'd never bothered to look at the actual code very
> closely.  It's surprisingly (well, I was surprised!) easy to extract the
> splines from the patches.  In this example, I set the number of patches
> around the "tube" to 3 (in the misc. panel of KnotPlot), so then if you
> strip off the first vector from each patch (which I did with a judicious
> use of "replace" in Microsoft Word, since I'm a total dunce at
> programming), you can make an array that has the 3 edge splines listed
> in order (0 .. Tot/3 - 1, Tot/3 .. 2*Tot/3 - 1, 2*Tot/3, Tot - 1, where
> Tot is the size of the array.)  I originally did this to check out Mike
> Williams' Rope macro, but I haven't gotten that far yet.  Anyway, if you
> use the 3 edge splines, you can make a center spline by averaging the
> edge ones.  Then, the sky's the limit.
>
> Scene file available upon request.
>
> Dave Matthews
>

Hi, I'd be very interested in seeing the code.  Please please please pretty
please :)

Cheers Dre

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