[Dune] Extract neighbouring element opposite to a certain vertex

[Agnese, Marco]

Hi,

I have a simplex entity and I want to extract the neighbouring element opposite to the vertex with local index vtxIdx.

Therefore I need to find the intersection opposite to this vertex.

This intersection has local index faceIdx=worlddim-vtxIdx. Is it right?


So if I extract entity.template subEntity<1>(faceIdx) I should be able to extract this face. Am I correct? But the face extracted in this way is not an intersection therefore I can't use it to find the neighbouring entity. Is there a solution here?


The other solution is to loop over the intersections and extract the vtxIdx-th one. But does it work always? Or which is the ordering of this intersections?

I would expect to have them sorted accordingly the face local index (so faceIdx) but that seems not to be the case. What am I missing?


Thank you very much for your help,

cheers,

Marco.

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