# Issue with Particlepath filter

**URL:** https://discourse.paraview.org/t/issue-with-particlepath-filter/5516
**Category:** ParaView Support
**Tags:** vtk
**Created:** [October 7, 2020, 12:45pm UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516 "2020-10-07T12:45:18Z")
**Posts on this page:** 7
**Page:** 1

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### Author: ![physahel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/physahel/32/3179_2.png) [@physahel](https://discourse.paraview.org/u/physahel)
#### Post date: [October 7, 2020, 12:45pm UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/1 "2020-10-07T12:45:18Z")

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Dear Support members,

I am trying to analyze here how streamlines and pathlines look like from my simulation data. For streamlines: I am using Mask points filter on some physics variables to choose seeds at every time step. Now when I try to use particlepath filter with same mask points(only intial), in the next time step all points are disappeared. So I couldn’t get pathlines for those selected seeds. Could you please help me to resolve this issue ?

Thanking you  
Best Regards,  
Sahel

 ![swirl_stream](https://discourse.paraview.org/uploads/default/original/2X/2/257753327ef019ed11f3eba5c2e732dc84eccf52.jpeg)

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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: [October 7, 2020, 1:04pm UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/2 "2020-10-07T13:04:05Z")

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Maskpoints will not select the same points at each timesteps. You will have to extract the points you want using a non random criteria.

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### Author: ![physahel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/physahel/32/3179_2.png) [@physahel](https://discourse.paraview.org/u/physahel)
#### Post date: [October 7, 2020, 2:54pm UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/3 "2020-10-07T14:54:18Z")

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Okay, thanks for the suggestion.

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### Author: ![physahel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/physahel/32/3179_2.png) [@physahel](https://discourse.paraview.org/u/physahel)
#### Post date: [October 7, 2020, 3:40pm UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/4 "2020-10-07T15:40:09Z")

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Is it possible to save coordinates of masking points as a .csv/.txt file in Paraview?

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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: [October 8, 2020, 8:15am UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/5 "2020-10-08T08:15:11Z")

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Yes, you can then reload them in ParaView.

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### Author: ![physahel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/physahel/32/3179_2.png) [@physahel](https://discourse.paraview.org/u/physahel)
#### Post date: [October 8, 2020, 8:27am UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/6 "2020-10-08T08:27:19Z")

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Please tell me how to save mask points to the .csv file. I tried to save them in the usual way but it only shows save option for input data but not mask points.

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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: [October 8, 2020, 9:21am UTC](https://discourse.paraview.org/t/issue-with-particlepath-filter/5516/7 "2020-10-08T09:21:48Z")

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Click on the mask point filter, then File -\> SaveData