[Gmsh] Force certain Tetrahedron quality

[Florian M. Wagner]

Dear gmsh users,

I would like to force gmsh to a certain tetrahedron quality. In Tetgen, 
I was used to a quality criterion -q ( 
http://wias-berlin.de/software/tetgen/1.5/doc/manual/manual005.html#cmd-q ), 
which forced a maximum *ratio of the tetrahedral edge lengths and the 
radius of the circumscribing sphere*.

Is there anything comparable in gmsh, which I could call from the 
command line (I would like to do a convergence test in comparison to an 
analytical solution)?
Up till know I just played with characteristic length scaling and viewed 
mesh statistics, but can they be enforced as well?

Thank you very much for your help
Florian

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