# Extract Streamlines arrival time

**URL:** https://discourse.vtk.org/t/extract-streamlines-arrival-time/7108
**Category:** Support
**Created:** [November 8, 2021, 12:04pm UTC](https://discourse.vtk.org/t/extract-streamlines-arrival-time/7108 "2021-11-08T12:04:23Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Francesco\_Montanaro](https://discourse.vtk.org/user_avatar/discourse.vtk.org/francesco_montanaro/32/4206_2.png) [@Francesco\_Montanaro](https://discourse.vtk.org/u/Francesco_Montanaro)
#### Post date: [November 8, 2021, 12:04pm UTC](https://discourse.vtk.org/t/extract-streamlines-arrival-time/7108/1 "2021-11-08T12:04:23Z")

</div>

Hi,  
I’m trying to extract “time” information for streamlines as the total time a particle needs for traveling from the starting point (of the streamline) to a certain position.  
I have already computed the streamlines associated to the Velocity vector by using the vtkStreamTracer class. However, I need also an information related to the temporal distance between two consecutive cells of the same streamline in order to compute the total arrival time.  
I was thinking of exploiting as information the “InitialIntergrationStep” but I don’t know if it is the correct way to do it.  
Thanks