Looking very good, Bill.

I won't pretend that I fully understand the method used to obtain the 
surface but it seems to do a good job for a (relatively) simple surface. Do 
you mean that overhangs could occlude the center from 'higher' surfaces? I 
would understand that. Seems an interesting method. If you have time to port 
that out to the community, I (at least) would be very grateful. I can 
imagine a lot of applications.

Thomas

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