On Tue, 07 Sep 1999 16:34:22 -0500, Larry Fontaine wrote:

>In addition to this,
>   difference { object a object b }
>is the same as
>   intersection { object a object {b inverse } }
>
>I think the latter computes faster? 

There's no way to know, because POV internally turns a difference into
the equivalent intersection.  Other than a little bit in the parser, 
there is no "difference" code in POV.

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