# Particle Tracking

**URL:** https://discourse.vtk.org/t/particle-tracking/4466
**Category:** Support
**Created:** [October 22, 2020, 6:27am UTC](https://discourse.vtk.org/t/particle-tracking/4466 "2020-10-22T06:27:05Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![jbensabat](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/j/6de8d8/32.png) [@jbensabat](https://discourse.vtk.org/u/jbensabat)
#### Post date: [October 22, 2020, 6:27am UTC](https://discourse.vtk.org/t/particle-tracking/4466/1 "2020-10-22T06:27:05Z")

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Hello  
We are trying to visualize pathlines using particle tracking (vtkParticleTracer) with an unstructured grid  
there is one example _TestParticleTracers_, which works on a regular grid.  
We used the sample example adapting it so it uses an unstructured grid.  
on request and execute it seems that it does not find “vectors”.  
I guess we are doing something wrong.  
is there any more detailed documentation on this ?  
best  
jac

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### Author: ![demacdo](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/d/fbc32d/32.png) [@demacdo](https://discourse.vtk.org/u/demacdo)
#### Post date: [March 28, 2021, 3:06pm UTC](https://discourse.vtk.org/t/particle-tracking/4466/2 "2021-03-28T15:06:10Z")

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Hi there, did you ever get vtkParticleTracer to work? I’m also having a hard time getting it to work on unstructured data. Thanks!

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### Author: ![mwestphal](https://discourse.vtk.org/user_avatar/discourse.vtk.org/mwestphal/32/19_2.png) [@mwestphal](https://discourse.vtk.org/u/mwestphal)
#### Post date: [March 29, 2021, 11:10am UTC](https://discourse.vtk.org/t/particle-tracking/4466/3 "2021-03-29T11:10:16Z")

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vtkParticleTracer can be tricky to use.

You need to make sure your data is distributed.