[Gmsh] Save all nodes but not 2D shell meshes in the physical surfaces

[Xingsheng Sun]

Hi All,

I am using Transfinite commend to generate 3D hex meshes. Now I want to
save all the 3D meshes, and only the nodes, but NOT the 2D shell meshes, in
the predefined physical surfaces. I used "Mesh.SaveGroupsOfNodes = 1", but
the 2D shell meshes are always in the output file. Could any people tell me
how to resolve the problem? Thanks in advance.

Best,
Xingsheng
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