# Square artifacts when baking stationary light

**URL:** <https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338>\
**Category:** Rendering\
**Tags:** Lightmass, stationary-lights, unreal-engine, Lightmap, lighting-problem, question, baked\
**Created:** [March 11, 2020, 8:06am UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338 "2020-03-11T08:06:10Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![YarosVishnevsky](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@YarosVishnevsky](https://forums.unrealengine.com/u/YarosVishnevsky)\
**Post date:** [March 11, 2020, 8:06am UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/1 "2020-03-11T08:06:10Z")

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Good afternoon! Has anyone encountered a similar error - square artifacts when baking light?

 ![297667-безымянныи5.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/5/c/c5cb21df1d299a45f3cb0df507710c20d957228d.jpeg)

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**Author:** ![Groupie935](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Groupie935](https://forums.unrealengine.com/u/Groupie935)\
**Post date:** [November 26, 2020, 1:09am UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/2 "2020-11-26T01:09:40Z")

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I have the same problem!

Any help would be great!

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**Author:** ![DanDoherty\_Arm](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DanDoherty\_Arm](https://forums.unrealengine.com/u/DanDoherty_Arm)\
**Post date:** [March 31, 2021, 4:24pm UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/3 "2021-03-31T16:24:12Z")

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I fixed this by checking Force No Precomputed Lighting and baked twice. This will remove all lightmaps, rebaked and it fixed it. I give no guarantees, though.

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**Author:** ![DanDoherty\_Arm](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DanDoherty\_Arm](https://forums.unrealengine.com/u/DanDoherty_Arm)\
**Post date:** [March 31, 2021, 4:24pm UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/4 "2021-03-31T16:24:27Z")

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I fixed this by checking Force No Precomputed Lighting and baked twice. This will remove all lightmaps, rebaked and it fixed it. I give no guarantees, though.

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**Author:** ![YarosVishnevsky](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@YarosVishnevsky](https://forums.unrealengine.com/u/YarosVishnevsky)\
**Post date:** [March 31, 2021, 4:27pm UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/5 "2021-03-31T16:27:07Z")

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i tried it but it didn’t work for me

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**Author:** ![DanDoherty\_Arm](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DanDoherty\_Arm](https://forums.unrealengine.com/u/DanDoherty_Arm)\
**Post date:** [March 31, 2021, 4:36pm UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/6 "2021-03-31T16:36:08Z")

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What about adding thickness to the object that’s casting the shadow? Instead of it being a 1 sided poly. (no idea if yours is 1 sided, but this may also help fix)

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**Author:** ![YarosVishnevsky](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@YarosVishnevsky](https://forums.unrealengine.com/u/YarosVishnevsky)\
**Post date:** [March 31, 2021, 4:42pm UTC](https://forums.unrealengine.com/t/square-artifacts-when-baking-stationary-light/462338/7 "2021-03-31T16:42:17Z")

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thanks interesting answer, I will try. but the truth also shows up on landscape