Matthias Hochsteger d08e2daa06 Do edge swapping for faces individually with tensor product meshes
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.
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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.

Description
Mesh generator
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