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95b4b49fc7
Linux distributions typically prefer system provided libraries, so optionally use it when found. (This also allows to use the github provided tarball, which omits the pybind11 submodule). Fix the PYBIND_INCLUDE_DIR usage: - remove misleading find_path invocation, which may point to the system wide pybind11 - use pybind11_INCLUDE_DIR which is provided by both find_package(pybind11) and bundled pybind11/CMakeLists.txt - pybind11_INCLUDE_DIR is used by pybind11_add_module, use it also for ngcore (core/register_archive.hpp)
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.