# Programmable Filter Doesn't Update after Time step

**URL:** https://discourse.paraview.org/t/programmable-filter-doesnt-update-after-time-step/10875
**Category:** ParaView Support
**Created:** [November 28, 2022, 6:47pm UTC](https://discourse.paraview.org/t/programmable-filter-doesnt-update-after-time-step/10875 "2022-11-28T18:47:41Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Devin\_Richard\_Bayly](https://discourse.paraview.org/user_avatar/discourse.paraview.org/devin_richard_bayly/32/5533_2.png) [@Devin\_Richard\_Bayly](https://discourse.paraview.org/u/Devin_Richard_Bayly)
#### Post date: [November 28, 2022, 6:47pm UTC](https://discourse.paraview.org/t/programmable-filter-doesnt-update-after-time-step/10875/1 "2022-11-28T18:47:41Z")

</div>

Hi there,

I’m trying to take the difference of two timesteps of my data to isolate the sections of greatest change in a 2d mesh. When I manually click “apply” I see the results that I want, but when I attempt to click play to step through time, the results of the programmable filter don’t show up. [Here’s a little screen recording of the issue](https://drive.google.com/open?id=1sQ-XhOs29riPYLmih3DkcC2gtG1X3Epd&usp=drive_copy). It seems like the `update` just didn’t propagate to the filter for some reason even though both of it’s input  
dependencies in the pipeline changed.  
[image\_filter\_demo.pvsm](https://discourse.paraview.org/uploads/short-url/dkgfaZCTdndZB7is2VOIeizE9aK.pvsm) (1.1 MB)  
[test\_data.hdf5](https://drive.google.com/open?id=1KvuRR_PLRVoitSowD5xcQF69N7_UHftv&usp=drive_copy)  
I tried adding the same information from my `programmableSource` to the `requestInformation` of the filter, but that doesn’t seem like the right move.