[Gmsh] mesh output with/without Physical Surfaces/Volumes

[Sitte, Matthias]

Hi all,

Taking my first baby steps with Gmsh, I created a simple “unit cube” geo script (see attached box1.geo file) with and without Physical Surfaces/Volumes. However, the mesh output (2D and 3D Frontal algorithm) seems to depend on whether or not I define Physical Surfaces/Volumes in the geo script (see other attached .geo and .msh files). This clearly looks very strange to me, so I’ wondering I’m making a (trivial? subtile?) mistake somewhere, but since I’m new to Gmsh I’m not able to locate it. Any help would be appreciated.

Best,
Matthias
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