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Use tolerance in GetElementOfPoint when using a search tree I'm getting artifacts at domain edges (see attached), because no tolerance is used when calling `elementsearchtree->GetIntersecting()` inside `GetElementOfPoint`.  See merge request !29
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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.
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