# 3D Lasso on a volume
**URL:** https://discourse.vtk.org/t/3d-lasso-on-a-volume/10733
**Category:** Support
**Created:** [February 20, 2023, 5:45pm UTC](https://discourse.vtk.org/t/3d-lasso-on-a-volume/10733 "2023-02-20T17:45:28Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [February 20, 2023, 5:45pm UTC](https://discourse.vtk.org/t/3d-lasso-on-a-volume/10733/1 "2023-02-20T17:45:28Z")
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?
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### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [February 20, 2023, 11:00pm UTC](https://discourse.vtk.org/t/3d-lasso-on-a-volume/10733/2 "2023-02-20T23:00:57Z")
Any suggestions for the steps required ?
please
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### Author:  [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [February 21, 2023, 1:53am UTC](https://discourse.vtk.org/t/3d-lasso-on-a-volume/10733/3 "2023-02-21T01:53:23Z")
This feature is not implemented in VTK but you can easily add it to your VTK-based application. See more information on the implementation in 3D Slicer [here](https://discourse.vtk.org/t/how-to-delete-hide-specific-points-from-vtkvolume/10431/2).
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### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [February 21, 2023, 7:26am UTC](https://discourse.vtk.org/t/3d-lasso-on-a-volume/10733/4 "2023-02-21T07:26:01Z")
@lassoan
Thanks for your quick reply and your help.
Can you show me the place where I draw the lasso curve by mouse points ?