# Extracting points inside a surface

**URL:** https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989
**Category:** ParaView Support
**Created:** [February 16, 2022, 6:25pm UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989 "2022-02-16T18:25:35Z")
**Posts on this page:** 6
**Page:** 1

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### Author: ![SCRO1022](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/aca169/32.png) [@SCRO1022](https://discourse.paraview.org/u/SCRO1022)
#### Post date: [February 16, 2022, 6:25pm UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989/1 "2022-02-16T18:25:35Z")

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Hello,

i am trying to extract some points inside a surface. I have an multiblock dataset, as you can see in my attached image. Extractblock1 is the Geometry/Mesh from which i want to extract the surface. Extractblock2 contains my points. There is a filter named “Exctract enclosed points” which sounds like what i need. But the problem is, this filter doesnt let me choose the extracted surface to cut the points… what am i missing?

And is there even a possibility to extract these points which are in a defined range/offset of the surface?

Thanks for your help!

 ![grafik](https://discourse.paraview.org/uploads/default/original/2X/4/4195d66a20bbd7f3c9a83f934ef1227047259847.jpeg)

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### Author: ![SCRO1022](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/aca169/32.png) [@SCRO1022](https://discourse.paraview.org/u/SCRO1022)
#### Post date: [February 18, 2022, 10:14am UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989/2 "2022-02-18T10:14:59Z")

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I managed to extract the Droplets with Resample with Dataset Filter and using a threshold on the valid points but i don’t think that’s the best way to do it. Is there another option?  
And after i extracted them i tried to integrate the droplets to get the sum of the mass but this doesn’t work and it only gives me 0 values… why?

 ![grafik](https://discourse.paraview.org/uploads/default/original/2X/d/d8127381946ff70027b4cb36bc18ae86dd6f1b9b.jpeg)

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### Author: ![SCRO1022](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/aca169/32.png) [@SCRO1022](https://discourse.paraview.org/u/SCRO1022)
#### Post date: [February 22, 2022, 5:23pm UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989/3 "2022-02-22T17:23:36Z")

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Is there no one who can help me? 🫤

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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: [February 23, 2022, 8:41am UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989/4 "2022-02-23T08:41:28Z")

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ConvertToPointCloud + ExtractEnclosedPoint works great but you need to define the surface first.

To define this surface, you can select the surface cells, use ExtractSelection + LinearExtrusion.

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### Author: ![SCRO1022](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/aca169/32.png) [@SCRO1022](https://discourse.paraview.org/u/SCRO1022)
#### Post date: [February 23, 2022, 10:18am UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989/5 "2022-02-23T10:18:09Z")

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I don’t have a ConvertToPointCloud Filter. What settings do you use for the LinearExtrusion?

Thanks 🙂

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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: [February 23, 2022, 10:20am UTC](https://discourse.paraview.org/t/extracting-points-inside-a-surface/8989/6 "2022-02-23T10:20:58Z")

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As large as you need to enclose your points