# Dark lighting/shadow issue when rotating the model

**URL:** <https://discourse.slicer.org/t/dark-lighting-shadow-issue-when-rotating-the-model/18351>\
**Category:** Development\
**Created:** [June 27, 2021, 5:24am UTC](https://discourse.slicer.org/t/dark-lighting-shadow-issue-when-rotating-the-model/18351 "2021-06-27T05:24:32Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![seanchoi0519](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/seanchoi0519/32/10354_2.png) [@seanchoi0519](https://discourse.slicer.org/u/seanchoi0519)\
**Post date:** [June 27, 2021, 5:24am UTC](https://discourse.slicer.org/t/dark-lighting-shadow-issue-when-rotating-the-model/18351/1 "2021-06-27T05:24:32Z")

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Is there any way to resolve the darkness/shadow when I rotate this model output I obtained from ALPACA?

 ![Screen Shot 2021-06-27 at 3.23.34 PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/8/b8d711191b584f79105097f6b3d700f140b13794.jpeg)

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**Author:** ![seanchoi0519](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/seanchoi0519/32/10354_2.png) [@seanchoi0519](https://discourse.slicer.org/u/seanchoi0519)\
**Post date:** [June 27, 2021, 10:56am UTC](https://discourse.slicer.org/t/dark-lighting-shadow-issue-when-rotating-the-model/18351/2 "2021-06-27T10:56:06Z")

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![Screen Shot 2021-06-27 at 8.54.43 PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/f/1f88c59e3ae546ec00ee00f1e1adb2cbc270adf3.jpeg)

Not sure what is happening. It is fine when I look at the model at a certain angle though.

 ![Screen Shot 2021-06-27 at 8.55.21 PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/2/62e872f1a3d33b21272d629950bc2df911d10cc3.jpeg)

I would simply like the lighting to be uniform everywhere. I’ve fiddled around with Lights extension however struggling to achieve so. Is there a way to remove shadows altogether?

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**Author:** ![seanchoi0519](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/seanchoi0519/32/10354_2.png) [@seanchoi0519](https://discourse.slicer.org/u/seanchoi0519)\
**Post date:** [June 27, 2021, 11:59am UTC](https://discourse.slicer.org/t/dark-lighting-shadow-issue-when-rotating-the-model/18351/3 "2021-06-27T11:59:06Z")

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Resolved - Changed the “Interpolation” under models to Flat

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 28, 2021, 3:57pm UTC](https://discourse.slicer.org/t/dark-lighting-shadow-issue-when-rotating-the-model/18351/4 "2021-06-28T15:57:09Z")

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It looks like your model was turned inside out. If that is indeed the issue then you can fix it in Surface Toolbox module (compute surface normals section, enable “Auto-orient normals”).