> When doing some DIFFERENCEs where the, um, surfaces of the objects are
> in the same plane it cuts a hole INTO the first object. not sure if it's
> supposed to do this, or if it's a bug of somekind.

I couldn't see the problem from your code (I didn't really know what I was
looking for).  First, a difference is intended to cut a hole in the first
object, subtracting one object from another.  Secondly, whenever two surfaces
coincide, it will always cause a problem, since the render will have to decide
which intersection to use.  As a general rule, you should never have two
surfaces directly coincide (sometimes it's OK, but not usually).

-Nathan

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