# Flip normal / primitive

**URL:** <https://discourse.slicer.org/t/flip-normal-primitive/26007>\
**Category:** Support\
**Created:** [November 1, 2022, 6:01pm UTC](https://discourse.slicer.org/t/flip-normal-primitive/26007 "2022-11-01T18:01:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mohammed\_alshakhas](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mohammed_alshakhas/32/10025_2.png) [@mohammed\_alshakhas](https://discourse.slicer.org/u/mohammed_alshakhas)\
**Post date:** [November 1, 2022, 6:01pm UTC](https://discourse.slicer.org/t/flip-normal-primitive/26007/1 "2022-11-01T18:01:34Z")

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i often segment and export scan models . after exporting the software I’m using for surgical simulation often get the models dark . i need to export to mesh mixer and do a flip to normal .

is there a way to avoid or correct that In slicer ?

thanks

 ![Screen Shot 2022-10-25 at 20.13.38](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/9/e9020a2d2cabef599f0823705c95a5513598c256.jpeg)

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [November 1, 2022, 7:13pm UTC](https://discourse.slicer.org/t/flip-normal-primitive/26007/2 "2022-11-01T19:13:27Z")

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You should be able to do the same thing with the Surface Toolbox:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/2/c2648f96d022a1845aff093c40b9a8d38496fcac.png)