In article <web.4405855061f3c539f37ab23e0@news.povray.org>,
 "Roman Reiner" <lim### [at] gmxde> wrote:

> "tgl" <aub### [at] sympaticoca> wrote:
> > Hello All
> > Is it possible to create an elliptical torus with a varying major diameter
> > and a constant minor diameter?
> >   Thanx,
> >   tgl
> 
> it should be possible with isosurfaces. see e.g.
> http://www.econym.demon.co.uk/isotut/variable.htm
> Another possibility would be to approximate the surface with a spheresweep,
> see 2.4.1.10 Sphere Sweep
> http://www.povray.org/documentation/view/3.6.1/284/
> 
> Regards Roman


as roman say, i think using sphere sweep is a right solution. computing 
points of an ellipse is easy.


-- 
klp

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