One of the drawbacks in box2d is that it's not supporting concave polygon shapes .
for that box2d flex employs several algorithms and converts a complex shape to a set of polygons (I took the idea from 3d modeling)
at this point i would like to give credits to
sakri.net for he's shape outline algorithm
makc.coverthesky.com for he's polygon2d
both state that their algorithms are far from perfect but for a v0.2 it's a good start.
in this case I'll start from the demo and then...
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