> 
> If you are interesting I can extract and modify my sources to
> IC_Linear_Sphere_Sweep and IC_Lathe

Yes, that would be interesting.

Since exact compatibility with the original shapes won't be possible with
all nonlinear spline based shapes i think having macros taking a spline as
parameter would be a good solution.

> 
> > The second sample refers to the recent discussion in p.g. about adding a
> > distance function to the povray shapes internally to allow proximity
> > calculations.
> 
> Looks interesting and sufficient for basic shapes however has obvious
> limitation - closed list of objects.
> 

I think it would be very difficult to use this as a proximity pattern for
CSG shapes since the gradients of all the functions are different and
therefore the proximity is different for the single CSG elements.  Also
all differences are likely to produce artefacts (like on the upper left of
the central sphere here).

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 06 Feb. 2002 _____./\/^>_*_<^\/\.______

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