# Crop surface mesh (vtk file)

**URL:** https://discourse.slicer.org/t/crop-surface-mesh-vtk-file/2405
**Category:** Support
**Created:** [March 22, 2018, 7:35pm UTC](https://discourse.slicer.org/t/crop-surface-mesh-vtk-file/2405 "2018-03-22T19:35:35Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![Joelle](https://avatars.discourse-cdn.com/v4/letter/j/50afbb/32.png) [@Joelle](https://discourse.slicer.org/u/Joelle)
#### Post date: [March 25, 2018, 6:03pm UTC](https://discourse.slicer.org/t/crop-surface-mesh-vtk-file/2405/5 "2018-03-25T18:03:04Z")

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Hey  
My goal is to compare symmetry of the surface. But only on a certain part of the model. For this I need to be able to cut the model and save it as a new one.

I tried to work with ROI but I didn’t manage to only compare the ROI with each other.

To compare the surface I already asked once 🙂 (see link) [Surface similarity of a model](https://discourse.slicer.org/t/surface-similarity-of-a-model/2287)  
Thanks again

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