Create one piece Polygonal Geometry 

My Alternativa3D Study Roadmap
*  by Michael Chau (michael@designquest.com.hk)
*  http://www.designquest.com.hk/_experiments/alternativa3d/
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*  How to create polygonal? 
*  Try to create one piece polygonal to easier understand
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*  forked from designquest's Create Polygonal Geometry 
*  Original code from : http://docs.alternativaplatform.com/display/TDEN/Building+geometry
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