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If the mesh contains quads, the edge swapping algorithm switches to generic improve, which introduces quads everywhere. This is not intended if one domain contains a tensor product mesh. Thus, call the optimizer for each face if mesh contains quads but mp.quad is not set.
Netgen mesh generator
NETGEN is an automatic 3d tetrahedral mesh generator. It accepts input from constructive solid geometry (CSG) or boundary representation (BRep) from STL file format. The connection to a geometry kernel allows the handling of IGES and STEP files. NETGEN contains modules for mesh optimization and hierarchical mesh refinement. Netgen 6.x supports scripting via a Python interface. Netgen is open source based on the LGPL license. It is available for Unix/Linux, Windows, and OSX.
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