On Fri, 15 Oct 1999 08:56:37 -0700, Ken wrote:
> Actually the code was intentionaly left as it was to illustrate the
>problem. What I am confused about though is why the coincident surface
>problem is manifesting itself on the surface areas of the sphere that
>are in no way in contact with any of the csg operation. 

Because the whole thing is part of the csg operation.  Taking out the 
irrelevant parts, you're left with this, which is obviously wrong:

difference {
  sphere   {<0,0,0>, 1 pigment { rgb 1 }}
  sphere   {<0,0,0>, 1 pigment { rgb 1 }}
  sphere   {<0,0,0>, 1 pigment { rgb 1 }}
  :
  :
}

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