Returns a structure variable with default options to run Gmsh. The primary purpose of this function is to return a variable with all necessary fields that one need to edit, so that users are unlikely to forget any field.
Version : 1.0
Author : George Kourakos
Department of Land Air and Water
University of California Davis
no input required
opt: A structure variable with the following fields:
lc_gen : Maximum size of element
embed_points : Embed or not the point in the mesh. 1-> the Gmsh will try to use the points as mesh nodes. 0-> ignore points
embed_lines : Embed or not the lines in the mesh. 1-> the Gmsh will try to constrain the mesh on the lines. 0-> will ignorethe lines
el_type : valid options are 'triangle' and 'quad'
el_order : 1->linear, 2->quadratic
incomplete : in case of quadratic elements setting to 1 will generates incomplete elements. (However incomplete elements are not supported by mSim)
The default mSim mesh options are:
opt = lc_gen:  embed_points: 0 embed_lines: 0 el_type: 'triangle' el_order: 1 incomplete: 0