# extract the wall in 3D

**URL:** https://discourse.paraview.org/t/extract-the-wall-in-3d/14668
**Category:** ParaView Support
**Created:** [May 19, 2024, 3:31pm UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668 "2024-05-19T15:31:03Z")
**Posts on this page:** 7
**Page:** 1

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### Author: ![xq520](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/x/43a26b/32.png) [@xq520](https://discourse.paraview.org/u/xq520)
#### Post date: [May 19, 2024, 3:31pm UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/1 "2024-05-19T15:31:03Z")

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Hello, I want to extract the wall in 3D, the filter feature edge is in 2D, but what can I use in 3D to get surface wall?

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### Author: ![FEngineer](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/f/5f8ce5/32.png) [@FEngineer](https://discourse.paraview.org/u/FEngineer)
#### Post date: [May 19, 2024, 4:00pm UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/2 "2024-05-19T16:00:56Z")

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[paraview.simple.ExtractSurface — ParaView/Python 5.12.0-1019-g97d096cc52 documentation](https://kitware.github.io/paraview-docs/latest/python/paraview.simple.ExtractSurface.html) ?

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### Author: ![xq520](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/x/43a26b/32.png) [@xq520](https://discourse.paraview.org/u/xq520)
#### Post date: [May 20, 2024, 2:00am UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/3 "2024-05-20T02:00:08Z")

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Thanks for your kind reply.

The filiter extrasurface converts my data from an unstructured grid to a polygon dataset. But then how can I extract the wall in 3D?

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### Author: ![spyridon97](https://discourse.paraview.org/user_avatar/discourse.paraview.org/spyridon97/32/11569_2.png) [@spyridon97](https://discourse.paraview.org/u/spyridon97)
#### Post date: [May 20, 2024, 4:10am UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/4 "2024-05-20T04:10:51Z")

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What do you mean by wall? Describe it geometrically

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### Author: ![xq520](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/x/43a26b/32.png) [@xq520](https://discourse.paraview.org/u/xq520)
#### Post date: [May 20, 2024, 5:59am UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/5 "2024-05-20T05:59:00Z")

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Hello, I want to get span-average data across the z direction. Firstly, I think I should extract the airfoil wall as the image seen, then I do something else. Am I right? If not, could you give me some advice? The file is attached. Thanks a lot.

 ![image](https://discourse.paraview.org/uploads/default/original/2X/1/1ea7a93d11de44c5ffdd005fe39277d9ef93a72b.png)

> **[turbine.vtu](https://drive.google.com/file/d/1yblQitN_3I3SNEBbTNa5czcmj8ZFUfa-/view?usp=drive_link)**
>
> Google Drive file.

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### Author: ![spyridon97](https://discourse.paraview.org/user_avatar/discourse.paraview.org/spyridon97/32/11569_2.png) [@spyridon97](https://discourse.paraview.org/u/spyridon97)
#### Post date: [May 31, 2024, 9:19am UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/6 "2024-05-31T09:19:13Z")

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What is the span-average data across the z direction?

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### Author: ![xq520](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/x/43a26b/32.png) [@xq520](https://discourse.paraview.org/u/xq520)
#### Post date: [June 4, 2024, 8:22am UTC](https://discourse.paraview.org/t/extract-the-wall-in-3d/14668/7 "2024-06-04T08:22:34Z")

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That’s the space anerage in the z direction