# 3D Lasso on volume

**URL:** https://discourse.paraview.org/t/3d-lasso-on-volume/11454
**Category:** ParaView Support
**Created:** [February 21, 2023, 12:03am UTC](https://discourse.paraview.org/t/3d-lasso-on-volume/11454 "2023-02-21T00:03:00Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![andreahmed](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/aeb1de/32.png) [@andreahmed](https://discourse.paraview.org/u/andreahmed)
#### Post date: [February 21, 2023, 12:03am UTC](https://discourse.paraview.org/t/3d-lasso-on-volume/11454/1 "2023-02-21T00:03:01Z")

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Hello,  
I’m looking for an algorithm or an example for a 3D Lasso on 3D Volume.  
I was looking for VtkVolumePicker class, but in the example there is no volume that is input into that class, all I see is picker.Pick(x,y,0,ren).  
Can you point to me an algorithm to achieve 3D Lasso rendering on a selected volume using mouse?  
I have seen that paraview implement a lasso drawing tool, but I’m lost in the source code don’t know where is it