Finding unconnected regions in a triangulation

[Kaushik Das]

Hi all,

Is there any way to find or count number of unconnected regions in a triangulation. Triangulation will have non zero refinement levels. 

Thanks,

Kaushik 

[Bruno Turcksin]

Kaushik,

You could use get_face_connectivity_of_cells() or get_vertex_connectivity_of_cells() (depending on what you mean by connected) to have a sparsity pattern. This maps to a graph where the nodes are the cells, now you just need to check if the graph is connected see here

Best,

Bruno

[Kaushik Das]

Hi   Bruno, thank you very much for your quick reply. This is what I was looking for. Thanks. But I have another question, is there a way the generate these graph by only considering a subset of cells from a triangulation? Like cells that has a specific fe_index or material_id or flags? Thank you. 

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[Daniel Arndt]

Kaushik,

The implementation for those functions is pretty simple so it shouldn't be too hard to modify them to meet your needs, see https://dealii.org/current/doxygen/deal.II/grid__tools_8cc_source.html#l03828.

Best,

Daniel

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[Kaushik Das]

I see. thanks for the tip. 

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