NETGEN import error when running core_smesh_netgen.py example

[pauloz1890]

Thanks for the awesome repo sven. I've been looking to implement SMESH with pythonOCC after I was disappointed that SMESH is no included in pythonOCC anymore. I've been able to install everything following your instructions but I cannot get core_smesh_netgen.py example working properly. When I run it I get the following error message:
File "core_smesh_netgen.py", line 21, in
from OCC.NETGENPlugin import *
File "...pythonocc_build/install/pythonocc/OCC/NETGENPlugin.py", line 32, in
_NETGENPlugin = swig_import_helper()
File "...pythonocc_build/install/pythonocc/OCC/NETGENPlugin.py", line 28, in swig_import_helper
_mod = imp.load_module('_NETGENPlugin', fp, pathname, description)
ImportError: ...pythonocc_build/install/pythonocc/OCC/_NETGENPlugin.so: undefined symbol: _ZN26NETGENPlugin_Hypothesis_2D21GetDefaultQuadAllowedEv

Any idea how to fix this? To be clear I've run the following without issue:
run_tests.py
core_smesh_unittest.py

How exactly does NETGEN work with SMESH? Did you take care of this in the installation procedure? Perhaps I've done something incorrectly? I skipped step5 - could it be this?

Thanks for your time.

[sven-hm]

Hi Paul, sounds like the netgen plugin is not built properly from the swig files...
maybe it's a problem with the swig version? Which version do you use?

Netgen can handle occ geometries and smesh provides an interface to formulate meshing hypothesis. But I have still some issues with setting the local_maxh in occgenmesh.cpp, as you might have seen in the git history. So it is not possible to provide local mesh constraints for the maximum face hight of a triangle in this version... I'm working on it but I'm still in the learning process somehow (:

[pauloz1890]

I used the latest SWIG-3.0.7. Was it a bad idea to use the latest version?

[sven-hm]

I only tried 3.0.2 and 3.0.5. Maybe you can try one of these, just to exclude this kind of problem?