# Can I calculate the normal of a closed area

**URL:** https://discourse.vtk.org/t/can-i-calculate-the-normal-of-a-closed-area/2457
**Category:** Support
**Created:** [January 20, 2020, 4:00am UTC](https://discourse.vtk.org/t/can-i-calculate-the-normal-of-a-closed-area/2457 "2020-01-20T04:00:13Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![3dprintingdoctor](https://discourse.vtk.org/user_avatar/discourse.vtk.org/3dprintingdoctor/32/1659_2.png) [@3dprintingdoctor](https://discourse.vtk.org/u/3dprintingdoctor)
#### Post date: [January 20, 2020, 4:00am UTC](https://discourse.vtk.org/t/can-i-calculate-the-normal-of-a-closed-area/2457/1 "2020-01-20T04:00:13Z")

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Can I calculate the normal of a closed 3d area. Such as the picked area from a sphere.

 ![image](https://discourse.vtk.org/uploads/default/original/2X/d/d17881702afa931c4430aa7140148b924d4dae24.png)