# Subsetting Data for in situ visualization
**URL:** https://discourse.paraview.org/t/subsetting-data-for-in-situ-visualization/14675
**Category:** In Situ Support
**Created:** [May 20, 2024, 3:28pm UTC](https://discourse.paraview.org/t/subsetting-data-for-in-situ-visualization/14675 "2024-05-20T15:28:15Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Muzafarwani](https://discourse.paraview.org/u/Muzafarwani)
#### Post date: [May 20, 2024, 3:28pm UTC](https://discourse.paraview.org/t/subsetting-data-for-in-situ-visualization/14675/1 "2024-05-20T15:28:15Z")
I want to know can Paraview/Catalyst handle a scenario where Paraview is used for in situ visualization and a mesh is defined for a variable and visualization happens for x time steps out of N time steps for one variable of a simulation, After few time steps I don’t want to transfer the whole variable for visualization only a part of that variable, as only certain part of the variable has changed in between the time steps.
Can it be done with Paraview. I read a paper link below
> **[Adaptive Performance-Constrained In Situ Visualization of Atmospheric...](https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7776519)**
>
> While many parallel visualization tools now provide in situ visualization capabilities, the trend has been to feed such tools with large amounts of unprocessed output data and let them render everything at the highest possible resolution. This leads...
They have done it using Paraview by using reduction but they have not mentioned how they have done it. I want to know how it can be done using Paraview/Catalyst and if yes can you share any such example
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [May 21, 2024, 9:48am UTC](https://discourse.paraview.org/t/subsetting-data-for-in-situ-visualization/14675/2 "2024-05-21T09:48:43Z")
@nicolas.vuaille @Francois_Mazen