You might try two separate polygons with nearly identical vertices,
each in appropriate order, to build one side separately from the other.
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code UW/Br Root 200 work 831.656.2149
Monterey California 93943-5000 USA fax 831.656.3679
Virtual worlds/underwater robots/Internet http://web.nps.navy.mil/~brutzman
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