# Light problem after i build it

**URL:** <https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812>\
**Category:** Rendering\
**Tags:** lighting-build, unreal-engine, lighting-problem, Lighting, question\
**Created:** [June 12, 2021, 6:14pm UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812 "2021-06-12T18:14:17Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![robogreek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robogreek](https://forums.unrealengine.com/u/robogreek)\
**Post date:** [June 12, 2021, 6:14pm UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/1 "2021-06-12T18:14:17Z")

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hello, i am very new to lighting, and i have this problem when i build lighting, i found and tried many things but nothing fixed it

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**Author:** ![ClockworkOcean](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/clockworkocean/32/1169999_2.png) [@ClockworkOcean](https://forums.unrealengine.com/u/ClockworkOcean)\
**Post date:** [June 12, 2021, 6:50pm UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/2 "2021-06-12T18:50:22Z")

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This vid has the solution ( probably )…

[![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/1/d/21d4ef070f9c7fd86271721cedfa73ee6555146d.jpeg "HTF do I? Fix weird banding issues in shadows on meshes") ](https://www.youtube.com/watch?v=_eruvJhZ460)

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**Author:** ![robogreek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robogreek](https://forums.unrealengine.com/u/robogreek)\
**Post date:** [June 13, 2021, 11:38am UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/3 "2021-06-13T11:38:17Z")

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hello, it didn’t fix the main problem but it fixed other small problem, thanks for answering

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**Author:** ![robogreek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robogreek](https://forums.unrealengine.com/u/robogreek)\
**Post date:** [June 13, 2021, 11:38am UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/4 "2021-06-13T11:38:18Z")

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Update: i didn’t find out the problem yet but i found some more info. if the light hits the walls, the walls change a bit like how they should be, but these things like “artifacts” stay there.

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**Author:** ![ClockworkOcean](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/clockworkocean/32/1169999_2.png) [@ClockworkOcean](https://forums.unrealengine.com/u/ClockworkOcean)\
**Post date:** [June 13, 2021, 11:50am UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/5 "2021-06-13T11:50:21Z")

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Ok, do you have a importance volume around the lot and try ( lightmass settings ) setting indirect lighting scale to 0.1-0.15 and 0.6 for smoothness.

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**Author:** ![robogreek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robogreek](https://forums.unrealengine.com/u/robogreek)\
**Post date:** [June 15, 2021, 8:10am UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/6 "2021-06-15T08:10:42Z")

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Update 2: i added a cube and it works fine, also i moved the back wall inside the room, built the lighting and for the specific wall it fixed

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**Author:** ![robogreek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@robogreek](https://forums.unrealengine.com/u/robogreek)\
**Post date:** [June 15, 2021, 8:10am UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/7 "2021-06-15T08:10:43Z")

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hello, it didn’t fix the problem, but thanks for answering. also check the screenshots in the comments Update 1 and Update 2

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**Author:** ![ClockworkOcean](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/clockworkocean/32/1169999_2.png) [@ClockworkOcean](https://forums.unrealengine.com/u/ClockworkOcean)\
**Post date:** [June 15, 2021, 8:19am UTC](https://forums.unrealengine.com/t/light-problem-after-i-build-it/484812/8 "2021-06-15T08:19:54Z")

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It did fix your problem, but now you have another problem. Your original problem as meshes shading differently, I don’t see that now.

That kind of square pattern on the wall, I have no idea how to get rid of that. Maybe re-post with a new subject…