The -optim option allows to preserve the initial sizes of the mesh edges in order to improve the mesh quality without modifying the edge lengths.

The prescribed size at a mesh vertex is computed (by the MMG3D_DoSol API function) as the mean of the lengths of the edges passing through this vertex.

Note that we preserve the mean of the edge lengths at vertices: thus, if the edges passing through a vertex have very different sizes, the resulting mesh may be far from the initial one.

This option is useless if you provide a sizemap with your mesh.

Example(s): mmg3d_opt1.

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