# Light Shuttering Issue

**URL:** <https://forums.unrealengine.com/t/light-shuttering-issue/349404>\
**Category:** Rendering\
**Tags:** Shadows, unreal-engine, Lighting, question\
**Created:** [March 3, 2016, 11:40am UTC](https://forums.unrealengine.com/t/light-shuttering-issue/349404 "2016-03-03T11:40:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tocs](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/tocs/32/562939_2.png) [@Tocs](https://forums.unrealengine.com/u/Tocs)\
**Post date:** [March 3, 2016, 11:40am UTC](https://forums.unrealengine.com/t/light-shuttering-issue/349404/1 "2016-03-03T11:40:30Z")

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Hi, I have a little problem with the lighting when shone at a slight angle along the face of an object. It creates a shuttering sort of effect. If I increase the angle of the light to the face it looks good. Is there a way to fix this?

I have played around with the light map density and it has no change to this. Is there anything or should I just change the sunlight angle as a workaround?

 ![80815-lighting+example.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/9/4/29417ae38f460c48b6980253b76e2fe62cc5c87d.png)

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**Author:** ![anonymous\_user\_2ed5b4c7](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_2ed5b4c7](https://forums.unrealengine.com/u/anonymous_user_2ed5b4c7)\
**Post date:** [March 3, 2016, 1:30pm UTC](https://forums.unrealengine.com/t/light-shuttering-issue/349404/2 "2016-03-03T13:30:49Z")

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Hi!

If you use **Dynamic Lighting** only in your scene, you should change **Shadow Bias**. Also you can adjust the **Shadow Filter Sharpness** to get the best results.

 ![80820-shadow01.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/e/7/ce73be6e4b345c3dcb275985a27a8b031ec7f6d0.jpeg)

 ![80821-shadow02.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/0/c/80c8138786d24cdc03ace2691bda90959c675647.jpeg)

But if you not planning to use **Dynamic Lighting** , then after building **Lightmaps** , shadow striping will disappear.

 ![80822-shadow03.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/f/3/0f3b1a413bfc421f01f90d0ac32ae4e1557e6f34.jpeg)

For more information about the lighting in UE4, please read this LightingTroubleshootingGuide.

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**Author:** ![Tocs](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/tocs/32/562939_2.png) [@Tocs](https://forums.unrealengine.com/u/Tocs)\
**Post date:** [March 4, 2016, 10:08am UTC](https://forums.unrealengine.com/t/light-shuttering-issue/349404/3 "2016-03-04T10:08:07Z")

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Thank you. I was playing around with the object not the light source. Moving the bias up to 1.5 gives a decent result.