I hope i understand what you are trying to ask here.
If you just create a group of lines hoping it will be meshed, thats not how gmsh would work. Since a line is a 1D element, which actually meshes in 1D. In order for gmsh to understand that it needs to mesh a 2D or 3D domain, you have to specify it as a "surface = 2D" and "volume = 3D". Regards, Aly Abdelaziz
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