bart wrote:
> bart wrote:
>> 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.
> 
> ...or you can even try to slice a toric section of a torus...
// e.g. like this:
//===========8<=============
camera {location  -z}

#local R1=0.6;
#local R2=0.55;
#local r1=0.3;
#local r2=0.22;

#local p=r1*1.05;
#local dp=0.001;

#local infty=difference{
   torus{R1,r1}
   torus{R2,r2}
   plane{z,p}
   plane{-z,-p-dp}
}

#object{infty
   pigment{rgb y}
}
//===========8<=============

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