I think this kind of thing is called a “pole of inaccessibility”. The wikipedia pages talks a bit about computation methods. The polylabel algorithm is reasonably easy to implement (i.e, even I could do it! 
).
I think this kind of thing is called a “pole of inaccessibility”. The wikipedia pages talks a bit about computation methods. The polylabel algorithm is reasonably easy to implement (i.e, even I could do it! ).