Greg M. Johnson wrote:
> To get the vector for spheres:
> 
> #declare centerA=<10,5.0,-5.50>;
> #declare radiusA=3.1415;
> #declare centerB=<1.0,-45.0,15.50>;
> #declare radiusB=0.1415;
> 
> #declare 1stpoint=  centerA+ radiusA*vnormalize(centerB-centerA);
> #declare 2ndpoint=  centerB+ radiusB*vnormalize(centerA-centerB);
> 
> Then the vector in question is between 1stpoint and 2ndpoint.
> A treatment for "circles"  is the same as that for spheres with coplanar
> centers.

Thanks, but my purpose requires a solution for pairs of circles with any 
orientation and position relative to one another, not just coplanar circles.

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