# velocity vector transformation from cartesian to polar

**URL:** https://discourse.paraview.org/t/velocity-vector-transformation-from-cartesian-to-polar/4063
**Category:** ParaView Support
**Created:** [April 14, 2020, 6:14am UTC](https://discourse.paraview.org/t/velocity-vector-transformation-from-cartesian-to-polar/4063 "2020-04-14T06:14:31Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![jurij.gostisa](https://discourse.paraview.org/user_avatar/discourse.paraview.org/jurij.gostisa/32/3453_2.png) [@jurij.gostisa](https://discourse.paraview.org/u/jurij.gostisa)
#### Post date: [April 14, 2020, 6:14am UTC](https://discourse.paraview.org/t/velocity-vector-transformation-from-cartesian-to-polar/4063/1 "2020-04-14T06:14:31Z")

</div>

I would like to transform a velocity on the cylinder in a way to get radial and tangential velocity components. To do that, I would need a theta value as shown on the picture, but ranging from 0 to 2pi

 ![image](https://discourse.paraview.org/uploads/default/original/2X/1/1ad29458c2f97f56c1d3f13ff9c954596da1b098.jpeg)

I am not that good with programmable filter and cannot figure it out for my multi-block dataset:

> **[circumferentialPlane.vtm and 1 more file](https://wetransfer.com/downloads/211c637154d8bc036ea2b788ec09f5bc20200414061358/91a943)**
>
> 2 files sent via WeTransfer, the simplest way to send your files around the world

Jurij