# How to make Filter time aware when one of its input is from temporal reader

**URL:** https://discourse.paraview.org/t/how-to-make-filter-time-aware-when-one-of-its-input-is-from-temporal-reader/4960
**Category:** Development
**Created:** [July 27, 2020, 1:19pm UTC](https://discourse.paraview.org/t/how-to-make-filter-time-aware-when-one-of-its-input-is-from-temporal-reader/4960 "2020-07-27T13:19:44Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![sharon](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/67e7ee/32.png) [@sharon](https://discourse.paraview.org/u/sharon)
#### Post date: [July 27, 2020, 1:19pm UTC](https://discourse.paraview.org/t/how-to-make-filter-time-aware-when-one-of-its-input-is-from-temporal-reader/4960/1 "2020-07-27T13:19:44Z")

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Dear All,  
I write one filter that has two input, one is vtkPolyData and the other is vtkTable. It special is vtkTable is from time series files.  
When i load time series files for vtkTable data, then i apply it with my filter, i expect my filter will update when user click the button “play”, but the result is only vtkTable update…filter result in render view is not update…

How to “tell” the filter to update according to animation start?

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<div class="post-metadata">

### Author: ![sharon](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/s/67e7ee/32.png) [@sharon](https://discourse.paraview.org/u/sharon)
#### Post date: [July 29, 2020, 10:05am UTC](https://discourse.paraview.org/t/how-to-make-filter-time-aware-when-one-of-its-input-is-from-temporal-reader/4960/2 "2020-07-29T10:05:59Z")

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You need re-implement method “RequestInformation” and set vtkStreamingDemandDrivenPipeline::TIME\_RANGE and vtkStreamingDemandDrivenPipeline::TIME\_STEPS for output Information.  
You can get them from input, then set the same for output, if you want to keep them match