# Unable to use Stream tracer with custom source filter

**URL:** https://discourse.paraview.org/t/unable-to-use-stream-tracer-with-custom-source-filter/16207
**Category:** ParaView Support
**Created:** [February 21, 2025, 3:58am UTC](https://discourse.paraview.org/t/unable-to-use-stream-tracer-with-custom-source-filter/16207 "2025-02-21T03:58:18Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![physahel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/physahel/32/3179_2.png) [@physahel](https://discourse.paraview.org/u/physahel)
#### Post date: [February 21, 2025, 3:58am UTC](https://discourse.paraview.org/t/unable-to-use-stream-tracer-with-custom-source-filter/16207/1 "2025-02-21T03:58:18Z")

</div>

Dear Support members,

I am trying to plot 3D magnetic field lines on the **unstructured grid** (data from the AMR model) but the **Stream tracer with custom** source filter is not working. First, I converted the cell data to point data type and then followed the relevant steps. For reference, you can see the LIC method is working perfectly for the data cube (attached png).

 ![magnetic_field](https://discourse.paraview.org/uploads/default/original/3X/5/6/561bc883df9709afae1fa7bb260063fb6bbf0e6b.jpeg)

It would be really helpful if you could look at the issue. Here is the Google Drive link to download the data and the state file. Thank you for your time.

link: [pfss\_extrapolation - Google Drive](https://drive.google.com/drive/folders/1c2tmrEygDRpQLrCMX9hbSijf1JgwUw95?usp=sharing)

Best regards,  
Sahel Dey

---

<div class="post-metadata">

### 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: [February 21, 2025, 9:03am UTC](https://discourse.paraview.org/t/unable-to-use-stream-tracer-with-custom-source-filter/16207/2 "2025-02-21T09:03:24Z")

</div>

Somehown the streamtracer doesnt like Voxels for some reason. Using a tetrahedralize before the streamtracer fixes the issue:

 ![image](https://discourse.paraview.org/uploads/default/original/3X/b/f/bf885732095b90d14f33b2570272cd56aedff5db.jpeg)

---

<div class="post-metadata">

### Author: ![physahel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/physahel/32/3179_2.png) [@physahel](https://discourse.paraview.org/u/physahel)
#### Post date: [February 21, 2025, 1:32pm UTC](https://discourse.paraview.org/t/unable-to-use-stream-tracer-with-custom-source-filter/16207/3 "2025-02-21T13:32:59Z")

</div>

Hi Mathieu,

Thank you so much for the prompt reply. With the tetrahedralize filter, I am able to visualise 3D magnetic field lines.

Thanks & regards,  
Sahel