> You might try replacing your polygons with flat boxes, that might fix
> it.
Ah, of course, this is the proper solution and should be used in
preference to mine. That's what I get for not reading the whole question
:-(

-- 
Six is a number perfect in itself, and not because God created the world
in six days;  rather the contrary is true.  God created the world in six
days because this number is perfect,  and it would remain perfect,  even
if the work of the six days did not exist.              -- St. Augustine

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