Wasn't it Kurts who wrote:
>hi,
>
>do you think i'ts possible to use this kind of equation to make pov object :
>
>  x = f(u,v)
>  y = g(u,v)
>  z = h(u,v)
>
>  and how ?
>
>  thanks for your ideas.

Those are called parametric equations, and the relevant section of the
documentation is "6.5.5 Parametric Object". It may help to have looked
at isosurfaces before studying this section.

See also the parametric page of my isosurface tutorial
<http://www.econym.demon.co.uk/isotut/parametric.htm>
and the page on Ingo Janssen's "param.inc" which uses a similar syntax
to generate a mesh2 object of the same shape.
<http://www.econym.demon.co.uk/isotut/param.htm>

-- 
Mike Williams
Gentleman of Leisure

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