# Clipping based on .stl or .obj file

**URL:** https://discourse.paraview.org/t/clipping-based-on-stl-or-obj-file/11735
**Category:** ParaView Support
**Created:** [March 28, 2023, 11:43am UTC](https://discourse.paraview.org/t/clipping-based-on-stl-or-obj-file/11735 "2023-03-28T11:43:43Z")
**Posts on this page:** 1
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### Author: ![Charles\_Gueunet](https://discourse.paraview.org/user_avatar/discourse.paraview.org/charles_gueunet/32/40_2.png) [@Charles\_Gueunet](https://discourse.paraview.org/u/Charles_Gueunet)
#### Post date: [March 28, 2023, 12:51pm UTC](https://discourse.paraview.org/t/clipping-based-on-stl-or-obj-file/11735/3 "2023-03-28T12:51:02Z")

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Hello @HiAeroCycling ,

If your meshes are already triangulated, or if you can afford to **Tetrahedarlize** and **Extract Surface** , you may be interested in [the vespa project](https://gitlab.kitware.com/vtk-cgal/vespa), which brings powerful geometry processing filters to ParaView thanks to the [CGAL library](https://www.cgal.org/).  
In your case, you may want to look at the boolean operations as described in [the following blog](https://www.kitware.com/vespa-advanced-mesh-processing-based-on-cgal-for-vtk-and-paraview/)

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