# How to display stream lines from 3D vector field with tvtk and Python

**URL:** https://discourse.paraview.org/t/how-to-display-stream-lines-from-3d-vector-field-with-tvtk-and-python/7162
**Category:** Development
**Tags:** python, vtk
**Created:** [May 6, 2021, 2:00pm UTC](https://discourse.paraview.org/t/how-to-display-stream-lines-from-3d-vector-field-with-tvtk-and-python/7162 "2021-05-06T14:00:15Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![randalljames](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/r/7ab992/32.png) [@randalljames](https://discourse.paraview.org/u/randalljames)
#### Post date: [May 6, 2021, 2:00pm UTC](https://discourse.paraview.org/t/how-to-display-stream-lines-from-3d-vector-field-with-tvtk-and-python/7162/1 "2021-05-06T14:00:15Z")

</div>

Hi all, I am trying to visualize stream lines from 3D velocity fields in a format lets say 10x10x100x100x3 where I have ten time steps, ten slices, 100x100 pixels inplane resolution and 3 vector components for each voxel. For every time step, my velocity field changes a bit. How can I display (moving) streamlines of my velocity field? Cheers Randall