[Gmsh] The first tag is the number of the physaical entity to which the element belongs?

[CHENJINX]

Hi,

 I have a question about how we can get the physical surface No. for
elements in GMSH File.



In default format of tetrahedorn Triangle mesh data as follow



117 2 3 0 1000028 0 436 359 371



117: Elm-number

2: Elm-type

3:　number of tags

0: The first tag is the number of the physaical entity to which the element
belongs.

1000028

0:　The third tag is the number of the mesh partition to which the element
belongs.

......



What reason does all entities of the first tag was show 0 for any Triangle
elements (ie. Elm-type 2)?

I wish to output the right first tag (the 3D element number with the 2D
Triangle of the Elm-type 2).

In addition, the 3D element number may be using the total Elm-number, or the
order for list of 3D element by itself.







Thank you.



CHEN J

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