# How to show cells that had a certain value at any given timestep?

**URL:** https://discourse.paraview.org/t/how-to-show-cells-that-had-a-certain-value-at-any-given-timestep/6424
**Category:** ParaView Support
**Created:** [February 9, 2021, 8:32am UTC](https://discourse.paraview.org/t/how-to-show-cells-that-had-a-certain-value-at-any-given-timestep/6424 "2021-02-09T08:32:10Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Terry](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/t/b9e5f3/32.png) [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [February 9, 2021, 8:32am UTC](https://discourse.paraview.org/t/how-to-show-cells-that-had-a-certain-value-at-any-given-timestep/6424/1 "2021-02-09T08:32:10Z")

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Hi,

I do CFD with phase changes and I need to see what had been melted. The general goal is an comparison with micrographs from experiments. A heat source melts my material (a value changes from 0 to 1) and the material resolidifies (value goes back to 0).

So I need to be able to show all cells that had myValue=1 at any given time in one final result.

Any help on how to achieve this is appreciated!  
Regards  
Terry

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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 9, 2021, 8:53am UTC](https://discourse.paraview.org/t/how-to-show-cells-that-had-a-certain-value-at-any-given-timestep/6424/2 "2021-02-09T08:53:03Z")

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Not sure this is doable easily, but at least you can easily recover the cells with myValue==1 by using Edit-\>FindData window.

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### Author: ![Terry](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/t/b9e5f3/32.png) [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [February 9, 2021, 9:04am UTC](https://discourse.paraview.org/t/how-to-show-cells-that-had-a-certain-value-at-any-given-timestep/6424/3 "2021-02-09T09:04:14Z")

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Thank you.  
So far i got Segmentation fault (core dumped). Was I doing to many things at the same time with two times paraview open and a pvpython script running?

There might exist a way to output an vtk set of the wanted cells via an openFoam function. That sure won’t be easy as well, though.