"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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