# stream tracer and structured meshes

**URL:** https://discourse.paraview.org/t/stream-tracer-and-structured-meshes/2182
**Category:** ParaView Support
**Created:** [July 8, 2019, 7:31pm UTC](https://discourse.paraview.org/t/stream-tracer-and-structured-meshes/2182 "2019-07-08T19:31:27Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [July 8, 2019, 7:31pm UTC](https://discourse.paraview.org/t/stream-tracer-and-structured-meshes/2182/1 "2019-07-08T19:31:27Z")

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Hi guys,  
Jeff is having issues doing stream tracers on a large structured mesh. File format (that Jeff is writing) is .vtm. Is this a known bug, or are we doing something wrong?

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### Author: ![utkarsh.ayachit](https://discourse.paraview.org/user_avatar/discourse.paraview.org/utkarsh.ayachit/32/39_2.png) [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)
#### Post date: [July 8, 2019, 7:47pm UTC](https://discourse.paraview.org/t/stream-tracer-and-structured-meshes/2182/2 "2019-07-08T19:47:19Z")

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nothing known. feel free to report issue with details.

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### Author: ![Andy\_Bauer](https://discourse.paraview.org/user_avatar/discourse.paraview.org/andy_bauer/32/5442_2.png) [@Andy\_Bauer](https://discourse.paraview.org/u/Andy_Bauer)
#### Post date: [July 8, 2019, 8:07pm UTC](https://discourse.paraview.org/t/stream-tracer-and-structured-meshes/2182/3 "2019-07-08T20:07:17Z")

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The output of the stream tracer filter should be just polydata. Is he using group datasets or something like that to generate a composite dataset? I’m wondering why data is getting written out in a .vtm file?

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [July 9, 2019, 2:09am UTC](https://discourse.paraview.org/t/stream-tracer-and-structured-meshes/2182/4 "2019-07-09T02:09:24Z")

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Jeff will create a dataset that we can use to debug, and that I can send to Kitware. I will write up a bug when we can replicate. Thanks for the replies.