algorithm - How to find the 'outline' of a (concave) graph in 2D plane? -

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i have connected graph in 2d plane composed of vertices , edges defined between them. overall shape of graph not convex, i.e. adjacent vertices on convex hull not connected edge. there existing algorithm finds 'outline' of graph? issue that's troubling me outline polygon may contain vertices not vertices in original graph, rather intersection of 2 edges, i'm not quite sure how deal it...

thanks!

niko


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