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I have a 2D unit cell consisting of 25 plane surfaces (its meshed form
is attached). I am generating a 3D cuboid mesh which will be about 20x20
unit cells using Translate, Duplicata, and Extrude. I would like to be
able to select all the surfaces that compose a face of the cuboid and
assign them to a physical group. I've done this in the past for a
different unit cell using "If" and "For" flow control and carefully
assigning the surfaces generated from Extrude to lists and then setting
the Physical groups equal to the lists. However, it was challenging to
ensure that I was capturing the correct surfaces. It would be much nicer
to say request all the surfaces that lie in a plane. Is such a selection
criteria possible in gmsh? I would guess not because it's not very
general, e.g. it would only really be applicable to flat entities. If
it's not possible, I would appreciate any suggestions for efficient ways
of assigning elementary entities to physical groups. Maybe my current
way is the best way...
