# streamlines tracing
**URL:** https://discourse.paraview.org/t/streamlines-tracing/13790
**Category:** ParaView Support
**Created:** [January 24, 2024, 6:22pm UTC](https://discourse.paraview.org/t/streamlines-tracing/13790 "2024-01-24T18:22:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@CELESTE\_GIULIANO](https://discourse.paraview.org/u/CELESTE_GIULIANO)
#### Post date: [January 24, 2024, 6:22pm UTC](https://discourse.paraview.org/t/streamlines-tracing/13790/1 "2024-01-24T18:22:49Z")
Hi, i’am new in Paraview. I’m trying to visualise the streamlines of a velocity field. The file that i have is a .vtp file (the . vtp is a solution of CFD simulation, obtained with SimVascular). I’m trying, for doing that, to use the filter “streamtracer”. But i didn’t succeded. I don’t understand what the problem is.
[SOLUTION\_FILE (2).zip](https://discourse.paraview.org/uploads/short-url/yF2F1hqPqXewW3Ocak3pq992FF7.zip) (1.8 MB)
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [January 25, 2024, 8:40am UTC](https://discourse.paraview.org/t/streamlines-tracing/13790/2 "2024-01-25T08:40:18Z")
> [@CELESTE\_GIULIANO](#):
>
> streamlines of a velocity field
Your data does not contain the field, only the surface, you cannot trace streamlines with that.
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### Author:  [@CELESTE\_GIULIANO](https://discourse.paraview.org/u/CELESTE_GIULIANO)
#### Post date: [January 25, 2024, 12:57pm UTC](https://discourse.paraview.org/t/streamlines-tracing/13790/3 "2024-01-25T12:57:10Z")
thanks a lot. i have understood the problem. i was totally wrong. Now i succeded in tracking the streamlines.