I have trying (somewhat successfully) to "chop" heightfields.  I first used
a bounded_by statement to make the heightfield round (to cut of the corners)
but then trying to remove a "chunk" from the inside is difficult.  When I
tried using the difference statement it never works and whatever the object
is (cube for example) ends up showing up regardless of using difference or
union.  I finally tried using a difference with a cube (with a clear
pigment) which seems to work but according to the Povray docs I shouldn't be
trying a "difference" with a heightfield.  I guess my question is are there
any "easy" ways to remove material from a hieghtfield without going to
convoluted methods??

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