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Also for a polygon with a hole: demo.py [t-shape_hole_extra_edge.txt](https://github.com/Botffy/polyskel/files/5183884/t-shape_hole_extra_edge.txt) 

We are trying to solve that through postprocessing of the skeleton in our port of the library: https://github.com/prochitecture/bpypolyskel/issues/5#issuecomment-706172626

> I'll link to your port in the Readme :) That would be nice. Here is the description of our port: A port of Botffy/polyskel library for Blender that outputs...

Hi @SuperKLA Blender 2.79 isn't supported anymore. Please install the latest stable version of Blender (currently 3.2).

Hi @zhaojingliang You can try it again later or use another OSM server. The related setting is located at the bottom of the addon preferences.

Can you point to that building on the map?

Yes, there is a problem. Thank you for reporting it. It will be fixed in the next release of the addon. I hope it will be in March.

Hi @jayliu50 , There is option "OSM data server" at the very bottom of the addon preferences. You could try another data server. You could also download a small file...

Please attach a screenshot of the roof and a screenshot of the related building on a map.

Roofs are UV'd