Greg M. Johnson wrote:
> I said once you'd completed the turn--
> I'd assert you always want zero roll.

And it is very easy to calculate the transformation that gives zero
roll.

> Interesting Q:  Is there a way to compute
> instantaneous "sphere of curvature" on a
> plain ol' pov 35. spline?

I don't know. Anyway, you may have use of looking at the file in the
POV-Ray distribution

scenes/animations/splinefollow/splinefollow.pov

And maybe have a look at the Spline_Trans macro in transforms.inc - not
that it will perfectly fit your needs, but it can perhaps get you
started.

Rune
--
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rune|vision:  http://runevision.com (updated Oct 19)
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