# Descriptions of generated streamtracer attributes

**URL:** https://discourse.vtk.org/t/descriptions-of-generated-streamtracer-attributes/4206
**Category:** Support
**Created:** [September 13, 2020, 11:31am UTC](https://discourse.vtk.org/t/descriptions-of-generated-streamtracer-attributes/4206 "2020-09-13T11:31:12Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Samuel\_James](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/s/3e96dc/32.png) [@Samuel\_James](https://discourse.vtk.org/u/Samuel_James)
#### Post date: [September 13, 2020, 11:31am UTC](https://discourse.vtk.org/t/descriptions-of-generated-streamtracer-attributes/4206/1 "2020-09-13T11:31:12Z")

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Hi all,

When integrating a streamline the streamtracer generates attributes angular velocity, rotation, and vorticity. Are there any documented descriptions of these attributes or how they are derived?

Thanks,  
Sam

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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: [September 14, 2020, 7:28am UTC](https://discourse.vtk.org/t/descriptions-of-generated-streamtracer-attributes/4206/2 "2020-09-14T07:28:38Z")

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[https://vtk.org/doc/nightly/html/classvtkStreamTracer.html](https://vtk.org/doc/nightly/html/classvtkStreamTracer.html)  
[https://gitlab.kitware.com/vtk/vtk/-/blob/master/Filters/FlowPaths/vtkStreamTracer.cxx](https://gitlab.kitware.com/vtk/vtk/-/blob/master/Filters/FlowPaths/vtkStreamTracer.cxx)