dave vanhorn wrote:
> Has anyone done one of these, either by CSG or isosurface?  I've been 
> playing with stretched rings, but they just don't look right.
> 

The simplest CSG would probably be for example, a union of spheres
along the shape. The shape of infty symbol
is the lemniscate - see e.g.
http://mathworld.wolfram.com/Lemniscate.html
there you can find the parametric equations for it.

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