# VtkHyperTreeGrid Super cursor issue in python

**URL:** https://discourse.paraview.org/t/vtkhypertreegrid-super-cursor-issue-in-python/7626
**Category:** Development
**Created:** [July 16, 2021, 8:47am UTC](https://discourse.paraview.org/t/vtkhypertreegrid-super-cursor-issue-in-python/7626 "2021-07-16T08:47:19Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Loic22](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/l/d6d6ee/32.png) [@Loic22](https://discourse.paraview.org/u/Loic22)
#### Post date: [July 16, 2021, 8:47am UTC](https://discourse.paraview.org/t/vtkhypertreegrid-super-cursor-issue-in-python/7626/1 "2021-07-16T08:47:19Z")

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Hello,

I notice a bug with the vtkHyperTreeGridNonOrientedMooreSuperCursor (and Von Neumann) using the Python interface. I am trying to get the cursor at neighbours of a specific cell but the call to the “GetNonOrientedGeometryCursor” (same issue with “Oriented”) function on super cursor leads to an error.

This is the problematic function call :

> cursor.GetNonOrientedGeometryCursor(SOUTH)

Which leads to the this error :

> ValueError: cannot create object of unknown type “vtkSmartPointer\_I41vtkHyperTreeGridNonOrientedGeometryCursorE”

I am using the vtk-9.0.1 installed with pip.

Thanks for your help;

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 3, 2021, 9:56am UTC](https://discourse.paraview.org/t/vtkhypertreegrid-super-cursor-issue-in-python/7626/2 "2021-08-03T09:56:41Z")

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You may want to take a look at the series of blog about HTG:  
[https://blog.kitware.com/hypertreegrid-in-vtk-an-introduction/](https://blog.kitware.com/hypertreegrid-in-vtk-an-introduction/)