>  From the perspective of pixels, "close enough is good enough".  At
> least for the proof of concept.
>
> I also remember seeing somewhere that there was a "POV Outline" or
> somesuch thing that someone wrote on the web...  does anyone have any
> experience with that?

If you only want a rough approximation of the intersection, why not use 
the "intersection" keyword?

Example of the locus of intersection between two hollow spheres:

#declare HollowSphere = difference{sphere{0,1}sphere{0,0.99}}

intersection
{
  object{ HollowSphere }
  object{ HollowSphere translate x*.3}
  pigment{ color rgb .1 }
}

You could then use trace with that object to find the surface if you 
want to place other objects on it.

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