# Cell Normals Array

**URL:** https://discourse.slicer.org/t/cell-normals-array/20206
**Category:** Support
**Created:** [October 18, 2021, 4:01pm UTC](https://discourse.slicer.org/t/cell-normals-array/20206 "2021-10-18T16:01:19Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![adamy](https://avatars.discourse-cdn.com/v4/letter/a/a88e57/32.png) [@adamy](https://discourse.slicer.org/u/adamy)
#### Post date: [October 18, 2021, 4:01pm UTC](https://discourse.slicer.org/t/cell-normals-array/20206/1 "2021-10-18T16:01:19Z")

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The surface models module creates point normals by default. How can I create an array containing normals of all of the cells (not point normals)?

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### Author: ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)
#### Post date: [October 18, 2021, 4:20pm UTC](https://discourse.slicer.org/t/cell-normals-array/20206/2 "2021-10-18T16:20:10Z")

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Use the normals filter with this option:  
[https://vtk.org/doc/nightly/html/classvtkPolyDataNormals.html#a4c27b2bfa1f4924ada7cffccf5aae643](https://vtk.org/doc/nightly/html/classvtkPolyDataNormals.html#a4c27b2bfa1f4924ada7cffccf5aae643)

Search on the forum (or on google) how to calculate normals if you don’t know how to use this filter. I’m sure there are examples