# Problem Creating Contours From Hyper Tree Grid. BUG
**URL:** https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959
**Category:** ParaView Support
**Created:** [December 12, 2022, 5:46pm UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959 "2022-12-12T17:46:55Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@cdelv](https://discourse.paraview.org/u/cdelv)
#### Post date: [December 12, 2022, 5:46pm UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/1 "2022-12-12T17:46:55Z")
Hi, I have a program that outputs a Hyper Tree Grid time series to Paraview. I need to calculate an integral over a contour. To create the contour I tried:
- Apply the filter `HyperTreeGrid To DualGrid`. Then I can create the contour. The problem is that when I change the time steps everything disappears. Even if I go back to the original time step.
- Applied the filter `HyperTreeGrid To UnstructuredGrid` which works well on every time step. To create the contour I applied `Cell Data to Point Data` to the unstructured grid and then created the contour. The problem is that nothing appeared on the render view, as if no contour was created. Also, I can’t calculate anything with the contour.
The data comes from a simulation with adaptative mesh refinement using octrees.
Can someone help me sort this issue out?
Thanks.
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### Author:  [@cdelv](https://discourse.paraview.org/u/cdelv)
#### Post date: [December 13, 2022, 2:20am UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/2 "2022-12-13T02:20:10Z")
It seems this is a bug. I has been reported here [HyperTreeGridToDualGrid BUG](https://discourse.paraview.org/t/hypertreegridtodualgrid-bug/9287) a long time ago. What should be done to fix it?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 13, 2022, 8:08am UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/3 "2022-12-13T08:08:21Z")
Hi @cdelv
I don’t think the issue was ever opened on [https://gitlab.kitware.com/paraview/paraview/-/issues](https://gitlab.kitware.com/paraview/paraview/-/issues)
Could you open it ?
Best,
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 13, 2022, 8:08am UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/4 "2022-12-13T08:08:45Z")
FYI @Charles_Gueunet @jfausty @Yohann_Bearzi
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### Author:  [@cdelv](https://discourse.paraview.org/u/cdelv)
#### Post date: [December 13, 2022, 2:31pm UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/5 "2022-12-13T14:31:17Z")
Hi @mwestphal. I will open the issue. Thank you for your answer.
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### Author:  [@sharaborin](https://discourse.paraview.org/u/sharaborin)
#### Post date: [December 22, 2022, 6:18am UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/6 "2022-12-22T06:18:36Z")
Hi, it was opened a half of year ago [HyperTreeGridToDualGrid BUG](https://discourse.paraview.org/t/hypertreegridtodualgrid-bug/9287)
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### Author:  [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [December 22, 2022, 6:56am UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/7 "2022-12-22T06:56:09Z")
Hi Eugene,
You point from this community support post to another community support post. Bugs are not logged here - they are logged in our gitlab site. Mathieu posted the link to the gitlab site above. If you don’t see this issue reported on gitlab, feel free to open a new issue. My guess is this is bug 21174.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 22, 2022, 7:33am UTC](https://discourse.paraview.org/t/problem-creating-contours-from-hyper-tree-grid-bug/10959/8 "2022-12-22T07:33:43Z")
The issue has been opened by @cdelv[https://gitlab.kitware.com/paraview/paraview/-/issues/21703](https://gitlab.kitware.com/paraview/paraview/-/issues/21703)