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Alpha shape, crust algorithm, surface reconstruction...

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Hi all, I'm looking for a good ressource on 2d "non-convex hull" algorithms, of which there apparenly exist quite a few. What I'm looking for is a sort of crust- or surface reconstruction algorithm, which processes a set of points and return a list or array containing those points which define the surface or crust of the set. A good ressource about alpha hulls / alpha shapes would also be greatly appreciated. ...and in this case "ressource" definitely also includes copy-paste'able source code :-) Cheers, Mike

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