ImportError from wheel installation

Hello - thank you so much for the energy that you are investing in providing a wheel installation for VTK.

I have successfully installed the software, but am running into errors on import.

When installing from conda, I get the following error:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
/srv/conda/envs/notebook/lib/python3.7/site-packages/vtkmodules/vtkRenderingOpenGL2.py in <module>
      4     # use relative import for installed modules
----> 5     from .vtkRenderingOpenGL2Python import *
      6 except ImportError:

ImportError: libGL.so.1: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-7c7f66f02cd3> in <module>
----> 1 import vtk

/srv/conda/envs/notebook/lib/python3.7/site-packages/vtk.py in <module>
     30     all_spec = importlib.util.find_spec('vtkmodules.all')
     31     all_m = importlib.util.module_from_spec(all_spec)
---> 32     all_spec.loader.exec_module(all_m)
     33 
     34     # import vtkmodules

/srv/conda/envs/notebook/lib/python3.7/site-packages/vtkmodules/all.py in <module>
     31 from .vtkIOXMLParser import *
     32 from .vtkDomainsChemistry import *
---> 33 from .vtkRenderingOpenGL2 import *
     34 from .vtkDomainsChemistryOpenGL2 import *
     35 from .vtkIOXML import *

/srv/conda/envs/notebook/lib/python3.7/site-packages/vtkmodules/vtkRenderingOpenGL2.py in <module>
      7     # during build and testing, the modules will be elsewhere,
      8     # e.g. in lib directory or Release/Debug config directories
----> 9     from vtkRenderingOpenGL2Python import *

ModuleNotFoundError: No module named 'vtkRenderingOpenGL2Python'

When installing with pip, I instead get the following error:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
/srv/conda/envs/notebook/lib/python3.7/site-packages/vtk/vtkOpenGLKit.py in <module>
      4     # use relative import for installed modules
----> 5     from .vtkOpenGLKitPython import *
      6 except ImportError:

ImportError: libGL.so.1: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-7c7f66f02cd3> in <module>
----> 1 import vtk

/srv/conda/envs/notebook/lib/python3.7/site-packages/vtk/__init__.py in <module>
     10 from .vtkRenderingKit import *
     11 from .vtkIOKit import *
---> 12 from .vtkOpenGLKit import *
     13 from .vtkParallelKit import *
     14 from .vtkWrappingKit import *

/srv/conda/envs/notebook/lib/python3.7/site-packages/vtk/vtkOpenGLKit.py in <module>
      7     # during build and testing, the modules will be elsewhere,
      8     # e.g. in lib directory or Release/Debug config directories
----> 9     from vtkOpenGLKitPython import *

ModuleNotFoundError: No module named 'vtkOpenGLKitPython'

Note also that this is happening on a headless system (through a Jupyter notebook, running on a JupyterHub installed on EKS), which may be pertinent information.

Thanks!

Inizia riproducendo import vtk nell’ambiente headless JupyterHub segnalato su EKS, utilizzando sia installazioni conda sia pip. Ispeziona i percorsi di importazione in vtkmodules/vtkRenderingOpenGL2.py e vtk/vtkOpenGLKit.py; il lavoro è completato quando il pacchetto viene importato correttamente nella configurazione headless segnalata, senza incorrere in errori relativi a moduli mancanti.