On Tuesday, October 22, 2002, at 11:16 AM, [EMAIL PROTECTED] wrote:

Probably the simplest approch would be to
subtract the y coordinate from the
height of the stack for each point -- could be done in a loop fairly
quickly.
Thanks Richard!  That did the trick. I should have figured that one out,
but you know how it is after the 12th hour of writing code.
I don't understand why this works.  Are all shapes symmetrical up and down?

Dar

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