[Gmsh] Gmsh 4 format - How to associate elements with physical entities

[Santiago Serebrinsky]

Hi all,

With Gmsh 2.2 format, it was very easy to tell which elements were
associated with each of the PhysicalEntities. Such tag was present in the
line describing the element data.

With Gmsh 4, I could not find such association.
Every element is part of a block with a given tagEntity, but I found no
relation between those tagEntity values and PhysicalNames.

Is that described anywhere?

Thanks.

Santiago
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