# select Self intersecting face in vtk

**URL:** https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200
**Category:** Support
**Created:** [December 15, 2022, 5:04am UTC](https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200 "2022-12-15T05:04:20Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![hye00525](https://discourse.vtk.org/user_avatar/discourse.vtk.org/hye00525/32/4904_2.png) [@hye00525](https://discourse.vtk.org/u/hye00525)
#### Post date: [December 15, 2022, 5:04am UTC](https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200/1 "2022-12-15T05:04:20Z")

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Hello, I would like to check the presence or absence of self intersecting face in stl mesh using vtk. Is there a filter that can do this?

Thank you. I look forward to your reply.

 ![image](https://discourse.vtk.org/uploads/default/original/2X/7/7b442422ceac6b042129c5fd38924b1e051787ec.png)

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### Author: ![spyridon97](https://discourse.vtk.org/user_avatar/discourse.vtk.org/spyridon97/32/7069_2.png) [@spyridon97](https://discourse.vtk.org/u/spyridon97)
#### Post date: [December 16, 2022, 12:17am UTC](https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200/2 "2022-12-16T00:17:06Z")

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Can you elaborate more on what this operation is supposed to do ?

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<div class="post-metadata">

### Author: ![hye00525](https://discourse.vtk.org/user_avatar/discourse.vtk.org/hye00525/32/4904_2.png) [@hye00525](https://discourse.vtk.org/u/hye00525)
#### Post date: [December 16, 2022, 8:58am UTC](https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200/3 "2022-12-16T08:58:30Z")

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Make sure that the mesh I created does not have a self-intersecting face.  
Because a crush occurs in the Tetgen library (Tetrahedralization lib, [https://wias-berlin.de/software/tetgen/](https://wias-berlin.de/software/tetgen/)) when there is a self-intersecting face.