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<p>Hi Martin,</p>
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<p>yes I am using conforming meshes. </p>
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<p>By the way <a href="https://www.dune-project.org/doc-2.2.1/doxygen/html/group__GeometryGenericReferenceElements.html" id="LPlnk133737" title="https://www.dune-project.org/doc-2.2.1/doxygen/html/group__GeometryGenericReferenceElements.html
Ctrl+Click or tap to follow the link">
https://www.dune-project.org/doc-2.2.1/doxygen/html/group__GeometryGenericReferenceElements.html</a> seems wrong for the 3d simplex (section 3.). Shouldn't be 1 bottom and 0 front in the face numbering picture? Otherwise vertex_idx+oppsite_face_idx != entity_dimension
for vertex_idx=3 or 2.</p>
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<p>Thank you very much,</p>
<p>Marco</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Martin Nolte <nolte@mathematik.uni-freiburg.de><br>
<b>Sent:</b> 25 February 2016 14:41<br>
<b>To:</b> dune@dune-project.org<br>
<b>Subject:</b> Re: [Dune] Extract neighbouring element opposite to a certain vertex</font>
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<div class="PlainText">Hi Marco,<br>
<br>
yes, you have to iterate over all intersections to find the corresponding <br>
neighboring entity (I assume you are using a conforming grid, otherwise the <br>
neighbor will not be unique).<br>
<br>
You seek the intersection satisfying<br>
<br>
indexInIndide() == Entity::dimension - vtxIdx.<br>
<br>
Note that, in general, the world dimension does not coincide with the <br>
dimension (though I guess it does in your case).<br>
<br>
As to your second question: There is no guarantee on the order the faces are <br>
traversed in.<br>
<br>
Best,<br>
<br>
Martin<br>
<br>
On 02/25/2016 03:29 PM, Agnese, Marco wrote:<br>
> Hi,<br>
><br>
> I have a simplex entity and I want to extract the neighbouring element<br>
> opposite to the vertex with local index vtxIdx.<br>
><br>
> Therefore I need to find the intersection opposite to this vertex.<br>
><br>
> This intersection has local index faceIdx=worlddim-vtxIdx. Is it right?<br>
><br>
><br>
> So if I extract entity.template subEntity<1>(faceIdx) I should be able to<br>
> extract this face. Am I correct? But the face extracted in this way is not an<br>
> intersection therefore I can't use it to find the neighbouring entity. Is<br>
> there a solution here?<br>
><br>
><br>
> The other solution is to loop over the intersections and extract the vtxIdx-th<br>
> one. But does it work always? Or which is the ordering of this intersections?<br>
><br>
> I would expect to have them sorted accordingly the face local index (so<br>
> faceIdx) but that seems not to be the case. What am I missing?<br>
><br>
><br>
> Thank you very much for your help,<br>
><br>
> cheers,<br>
><br>
> Marco.<br>
><br>
><br>
><br>
><br>
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<br>
-- <br>
Dr. Martin Nolte <nolte@mathematik.uni-freiburg.de><br>
<br>
Universität Freiburg phone: +49-761-203-5630<br>
Abteilung für angewandte Mathematik fax: +49-761-203-5632<br>
Hermann-Herder-Straße 10<br>
79104 Freiburg, Germany<br>
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