Scaling the vertical component down to +/- 1, and making it a little thinner 
got me to where I need to be.. Thanks!  :)


"Nicolas George" <nicolas$george@salle-s.org> wrote in message 
news:457d33ff$1@news.povray.org...
> "dave vanhorn"  wrote in message <457cb234@news.povray.org>:
>> Has anyone done one of these, either by CSG or isosurface?
>
> An infinity symbol is not a 3D object, so the question is: how do intend 
> to
> make it 3D? Do you want it infinitely thin? Flat but thick? Round?
>
> You can do something easy with a sphere sweep:
>
>  sphere_sweep {
>    b_spline
>    9,
>    <-2, -2, 0>, 0.2,
>    < 0,  0, 0>, 0.2,
>    < 2,  2, 0>, 0.2,
>    < 2, -2, 0>, 0.2,
>    < 0,  0, 0>, 0.2,
>    <-2,  2, 0>, 0.2,
>    <-2, -2, 0>, 0.2,
>    < 0,  0, 0>, 0.2,
>    < 2,  2, 0>, 0.2
>  }

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