Extrude CAP problem

"CAP" procedure of extruding works not so good

Here is the demo of problem

http://www.babylonjs-playground.com/#EALGM#0

Problem in Polygon triangulation algoritm. Will be nice if babylon include some effective triangulation algoritms.

I think it can be good base https://github.com/mapbox/earcut for it. Unfortunately I'm weak to realize it myself Image may be NSFW.
Clik here to view.