[Gmsh] How many ways to improve the quality of the mesh in gmsh-2.3-windows ?

[liang dong]

hi 
I can find three ways to improve the quality of the mesh in gmsh—2.3-windows.
1  change Element size factor  mesh—general-- Element size factor
2 optimize button      mesh ---optimize button
3 optimize netgen button  mesh---optimize netgen button
Any other ways to improve the quality of the mesh in gmsh-2.3-windows?
Can you tell me in detail?
                                                                                          dongliang


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