[Dune] question about getting vertex data

[Timo Koch]

Dear Ilya,

for any 1d grid in any world dimension you will get the local vertex index (in local numbering of the inside element (entity of codimension 0)) by intersection.indexInInside() member function.
You can then use a mapper like Dune::MultipleCodimMultipleGeomTypeMapper (with a VertexLayout) to get the vertex index on the gridview using the subIndex() member function.
In total the call could look something like this

auto vertexIndex = vertexMapper.subIndex(element, intersection.indexInInside(), /*codimension=*/ 1);

I’m happy you are using Dune::FoamGrid and hope you find it useful. Do you mind sharing for what application / in which field you are using it?

Best wishes
Timo



> On 18. Dec 2017, at 23:13, Ponomarev, Ilya <ilya.ponomarev at phystech.edu> wrote:
> 
> Good evening.
> 
> I have FoamGrid mesh 1d in 3d world and data, that stored in massive.
> This data are associated with vertex (first massive) and cells (second massive).
> When I iterate over cells and work with intersections in FV method, how can I get the index of vertex, which coincides with intersection?
> 
> Best regards,
> Ilya Ponomarev.
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