"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

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