# How to describe the motion trajectory of a particle

**URL:** https://discourse.paraview.org/t/how-to-describe-the-motion-trajectory-of-a-particle/15740
**Category:** ParaView Support
**Tags:** vtk
**Created:** [November 19, 2024, 1:55am UTC](https://discourse.paraview.org/t/how-to-describe-the-motion-trajectory-of-a-particle/15740 "2024-11-19T01:55:26Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Guanlong](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/g/82dd89/32.png) [@Guanlong](https://discourse.paraview.org/u/Guanlong)
#### Post date: [November 19, 2024, 1:55am UTC](https://discourse.paraview.org/t/how-to-describe-the-motion-trajectory-of-a-particle/15740/1 "2024-11-19T01:55:26Z")

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Hello researchers, I have two VTK files containing particle information, which includes two types of particles. I want to track the motion trajectory of a particle with type = 1 and obtain the results shown in the following figure. What should I do?

 ![1731981021301](https://discourse.paraview.org/uploads/default/original/2X/9/9065933e1fdd43561d6df1dee516c76d75d5c33a.png)  
[VTK\_case.zip](https://discourse.paraview.org/uploads/short-url/uXWkAU7zmgoUkifWRO5jY2ISknj.zip) (3.4 MB)

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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: [November 19, 2024, 8:52am UTC](https://discourse.paraview.org/t/how-to-describe-the-motion-trajectory-of-a-particle/15740/2 "2024-11-19T08:52:37Z")

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Hi @Guanlong

Your archive contains two files, which are two separate 2D point clouds.  
Point do have a `type` property and you can extract the point for type==1 if you want.

However, there is no timesteps inside to create a particle path with.

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<div class="post-metadata">

### Author: ![Guanlong](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/g/82dd89/32.png) [@Guanlong](https://discourse.paraview.org/u/Guanlong)
#### Post date: [November 20, 2024, 2:13am UTC](https://discourse.paraview.org/t/how-to-describe-the-motion-trajectory-of-a-particle/15740/3 "2024-11-20T02:13:32Z")

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Thank you for your reply. I want to upload multiple VTK files, but the website has a file size limit, so I can only upload two files. Is there any other way to upload files? I don’t know how to obtain the trajectory of particles.

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<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: [November 20, 2024, 8:28am UTC](https://discourse.paraview.org/t/how-to-describe-the-motion-trajectory-of-a-particle/15740/4 "2024-11-20T08:28:16Z")

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