# CGNS: streamlines visualization problem

**URL:** https://discourse.paraview.org/t/cgns-streamlines-visualization-problem/13812
**Category:** ParaView Support
**Created:** [January 28, 2024, 8:44am UTC](https://discourse.paraview.org/t/cgns-streamlines-visualization-problem/13812 "2024-01-28T08:44:49Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![GabriB](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/g/34f0e0/32.png) [@GabriB](https://discourse.paraview.org/u/GabriB)
#### Post date: [January 28, 2024, 8:44am UTC](https://discourse.paraview.org/t/cgns-streamlines-visualization-problem/13812/1 "2024-01-28T08:44:49Z")

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Dear all,

I imported the .CGNS file of my simulation containing the velocity field of my domain.

I tried to extract the streamlines using Stream Tracer and Stream tracer with Custom source.

In both cases my streamlines are cut (really short segment).

I tried also to extend the Maximum streamlines length, but nothing changed.

Do you know why this is happening and how can I solve it?

Please find attached the streamlines Figures.

Many thanks in advance.

Regards,

Gabriele

 ![stream_2](https://discourse.paraview.org/uploads/default/original/2X/8/87f93e566d6fe1ed88d739860073bc2c5c129d99.png)  
 ![stream_3](https://discourse.paraview.org/uploads/default/original/2X/0/059a9b84d996a328ccf6d194f686329887497850.png)  
 ![stream_1](https://discourse.paraview.org/uploads/default/original/2X/2/23b520a9aded422d8ef7634a1cde1a2df04dd1e2.png)

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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: [January 29, 2024, 9:44am UTC](https://discourse.paraview.org/t/cgns-streamlines-visualization-problem/13812/2 "2024-01-29T09:44:16Z")

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Probably incorrect meshing, please share your data.

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### Author: ![GabriB](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/g/34f0e0/32.png) [@GabriB](https://discourse.paraview.org/u/GabriB)
#### Post date: [January 29, 2024, 12:32pm UTC](https://discourse.paraview.org/t/cgns-streamlines-visualization-problem/13812/3 "2024-01-29T12:32:17Z")

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Dear Mathieu,

Thanks in advance for your support.

For the related data, please refer to this topic:

> [@CGNS domain file: split domain surfaces](https://discourse.paraview.org/t/cgns-domain-file-split-domain-surfaces/13813):
>
> Dear all, I imported my CGNS domain file. When I load the domain everything is defined as “one-block” (please refer to the attached Figure). I would like to split my domain patches, like the domain boundaries and my geometry boundaries. Do you know how can I achieve that? Many thanks in advance. Regards, Gabriele

I “played” with the advance setting and I changed the Interpolation Type with Cell Locator instead of point Locator.

Now the streamlines looks uniform and not trimmed, but I cannot confirm if that was actually the problem that I was facing. (please see the attached Figure).

 ![image](https://discourse.paraview.org/uploads/default/original/2X/e/ed6136d6953eaeb143d5084ba30c871e26116a63.png)

Many thanks in adavance.

Regards,

Gabriele

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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: [January 29, 2024, 1:03pm UTC](https://discourse.paraview.org/t/cgns-streamlines-visualization-problem/13812/4 "2024-01-29T13:03:20Z")

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> [@GabriB](#):
>
> I “played” with the advance setting and I changed the Interpolation Type with Cell Locator instead of point Locator.

This is indeed a way to fix streamlines when you have incorrect T cells in your mesh.