# integration time in streamline datasheet

**URL:** https://discourse.paraview.org/t/integration-time-in-streamline-datasheet/6757
**Category:** ParaView Support
**Tags:** python, vtk
**Created:** [March 22, 2021, 7:16am UTC](https://discourse.paraview.org/t/integration-time-in-streamline-datasheet/6757 "2021-03-22T07:16:21Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![mohammad\_faghih](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mohammad_faghih/32/6098_2.png) [@mohammad\_faghih](https://discourse.paraview.org/u/mohammad_faghih)
#### Post date: [March 22, 2021, 7:16am UTC](https://discourse.paraview.org/t/integration-time-in-streamline-datasheet/6757/1 "2021-03-22T07:16:21Z")

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When we generate some streamlines in paraview and export the spreadsheet out, one column is the Integration Time.  
I want to know how I can control this? I may need to increase or decrease resolution of the streamlines and I assume the Integration Time would effect how many points are used to comprise streamlines, thus can change a streamline’s resolution.

Thanks

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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: [March 22, 2021, 11:33am UTC](https://discourse.paraview.org/t/integration-time-in-streamline-datasheet/6757/2 "2021-03-22T11:33:26Z")

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Change the value of the “Initial Step Length” in the advanced options of the streamtracer.

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### Author: ![mohammad\_faghih](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mohammad_faghih/32/6098_2.png) [@mohammad\_faghih](https://discourse.paraview.org/u/mohammad_faghih)
#### Post date: [March 22, 2021, 6:07pm UTC](https://discourse.paraview.org/t/integration-time-in-streamline-datasheet/6757/3 "2021-03-22T18:07:48Z")

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Thanks!  
This might be tangential to my post topic, but still related to streamline generation.

I have a 2-D case from OpenFOAM and as you know 2-D cases in OpenFOAM are one cell thick in the third dimension.  
When I generate streamlines from my inlet in paraView, I get two rows of streamlines lying on the back and front planes; however I only want one row of streamlines from the center of the cells.  
I am not sure if I made myself clear or not. If not, please let me know so that I can provide more context.  
Thanks

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<div class="post-metadata">

### Author: ![mohammad\_faghih](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mohammad_faghih/32/6098_2.png) [@mohammad\_faghih](https://discourse.paraview.org/u/mohammad_faghih)
#### Post date: [March 22, 2021, 8:09pm UTC](https://discourse.paraview.org/t/integration-time-in-streamline-datasheet/6757/4 "2021-03-22T20:09:34Z")

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Ok, I found it.  
First you need to apply a cell center filter to your inlet patch, then use the custom streamline filter to have your streamlines start from cell centers.