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index to -1 this fixes 2 issues: * If extruded outwards in occ and curvature turned on, if sides are not set to index -1 then they are curved back towards the face again * If no different facedescriptor is set, blayer.Boundaries() would wrongly return the whole boundary and not only the layer part of the side.
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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