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I don't see why the union of a cylinder and a torus doesn't meet your
requirements. If I'm not mistaken, the derivatives of the surfaces of the
cylinder and the torus (if done correctly) should be equal at the
intersection, so there shouldn't be any abrupt changes in the smoothness of
both surfaces.
Or perhaps I'm misunderstanding your wishes...
Fernando.
"Rune" <run### [at] mobilixnet dk> wrote in message
news:3c824c95@news.povray.org...
> I found a function myself that works. I use this function in an isosurface
> which I scale by <1,1,0.2>. However, is it possible to make it faster?
>
> (sqrt(max(0,sqrt(x^2+y^2)*2-1)^4+z^2)-1)
>
> Rune
> --
> 3D images and anims, include files, tutorials and more:
> Rune's World: http://rsj.mobilixnet.dk (updated Feb 16)
> POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
> POV-Ray Webring: http://webring.povray.co.uk
>
>
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