# How to flips some inverted normals

**URL:** https://discourse.vtk.org/t/how-to-flips-some-inverted-normals/14555
**Category:** Support
**Created:** [September 10, 2024, 2:59pm UTC](https://discourse.vtk.org/t/how-to-flips-some-inverted-normals/14555 "2024-09-10T14:59:42Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![Paulo\_Carvalho](https://discourse.vtk.org/user_avatar/discourse.vtk.org/paulo_carvalho/32/370_2.png) [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)
#### Post date: [September 11, 2024, 3:47pm UTC](https://discourse.vtk.org/t/how-to-flips-some-inverted-normals/14555/3 "2024-09-11T15:47:53Z")

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Hello,

Check whether your mesh is manifold. That is, whether it can be unfolded into a 2D surface like those paper polyhedra we made during the school years. Being able to be unfolded, it allows to make all normals point into the same direction. Please, take a look at this: [Remove faces in contact with non-manifold edges](https://discourse.vtk.org/t/remove-faces-in-contact-with-non-manifold-edges/4116)

best,

PC

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