[Dune] Extract neighbouring element opposite to a certain vertex
nolte at mathematik.uni-freiburg.de
Thu Feb 25 15:41:51 CET 2016
yes, you have to iterate over all intersections to find the corresponding
neighboring entity (I assume you are using a conforming grid, otherwise the
neighbor will not be unique).
You seek the intersection satisfying
indexInIndide() == Entity::dimension - vtxIdx.
Note that, in general, the world dimension does not coincide with the
dimension (though I guess it does in your case).
As to your second question: There is no guarantee on the order the faces are
On 02/25/2016 03:29 PM, Agnese, Marco wrote:
> 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,
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> Dune at dune-project.org
Dr. Martin Nolte <nolte at mathematik.uni-freiburg.de>
Universität Freiburg phone: +49-761-203-5630
Abteilung für angewandte Mathematik fax: +49-761-203-5632
79104 Freiburg, Germany
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