[Gmsh] Unable to select surfaces using GUI

[Christophe Geuzaine]

> On 6 Jul 2020, at 21:51, A Chaube <achaube2 at illinois.edu> wrote:
> 
> Hello,
> 
> I have a complicated 2D mesh with lots of elements (which I cannot reduce in number), and I am extruding this into a 3D mesh. Upon extrusion, it becomes extremely challenging to keep track of new surfaces (needed for creating sidesets) - the easiest way seems to be to select them using the GUI.
> 
> However, the geometry model has no opacity for surfaces (just a wireframe marker), so everything looks really busy and it is impossible to click on the surface that I wish to select. Making mesh elements visible makes the model visually opaque and less busy, but some surface markers (the dotted crosses) simply disappear, making it impossible to select the right surface without a lot of effort (tracking common curves to deduce surface ID etc).
> 
> Could you please suggest a way to select physical surfaces when you have lots of different surfaces (12-20 per physical surface, and about 10 physical surfaces)?

You could use Tools->Visibility to hide/show only parts of the model, or Tools->Clipping. Once you have a mesh you can also only display mesh edges, which will allow to "see through".

Christophe

> 
> Thank you.
> Ash.
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine