[Gmsh] Control mesh size through API

[Bin Wen]

Hi guys,

I am working on using Gmsh as a library to generate meshes. The element
size I am getting is too small. I would like to find a good way to control
the element size (fine mesh on the zigzag boundary and coarse in the middle
of the domain,), and find that providing a field may be a solution.
However, I had hard time to find examples of how to set field through Gmsh
API. I am wondering if you have any suggestion or examples that could be
used as reference.

A good example could be the API version of tutorial t.10 on Gmsh
documentation (http://geuz.org/gmsh/doc/texinfo/gmsh.html#t10_002egeo).

Many thanks!
Bin
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