>I'm using primitive in a different sense than you are.  There
>are five CSG operations, counting inverse, but only three of
>them are primitive operations (as the term is used in Forth
>programming) The other two can be expressed in terms of the
>three primitives, and one actually is expressed that way in
>the source.

I know that difference is actually the intersection with the inverse.

Am I on the right track with merge ?

merge {
 object1
 object2
}

==

union {
 intersection {
   object1
   object2 inverse
  }
  intersection {
    object2
    object1 inverse
  }
}

Gail
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