I think you missed posting an image? And perhaps the data too?
AlphaShape doesn't work for this?
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I tried all possible alphas, for which the alphaShape changes, but I couldn't capture the interior of this polygon. Maybe it's because of the sharp 90-degree-edges?
The Input data was too many unordered points defining the boundary of the polygon.
...
https://www2.pic-upload.de/img/33311040/sketch-1497040111343.png
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