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163135981e
Functions with a python typed argument (kwargs in this case) cannot use py::call_guard<py::gil_scoped_release>() because it means, the GIL is not held when the function returns (and cleans up arguments/temporary variables). Thus, remove the global call guard and create a local variable py::gil_scoped_release gil_release; after arguments are processed and before meshing starts. This local variable is destroyed before the function returns (acquiring the GIL again).
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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