Observe attached image with a cube differenced from a heightfield.
How do I get the cube to completely difference from the heightfield
without leaving the planar surface?  Also, if I enlarge the cube
being differenced along the vertical axis, it effectively 'pushes'
the surface of the heightfield...

-- 
Tim Cook
http://empyrean.scifi-fantasy.com

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GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
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