# Lights not building right?

**URL:** <https://forums.unrealengine.com/t/lights-not-building-right/457143>\
**Category:** Rendering\
**Tags:** building-lighting, light, lighting-scenarios, light-build, unreal-engine, Lighting, question\
**Created:** [October 18, 2019, 11:09pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143 "2019-10-18T23:09:00Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Dividuum](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/dividuum/32/748742_2.png) [@Dividuum](https://forums.unrealengine.com/u/Dividuum)\
**Post date:** [October 19, 2019, 6:54pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/9 "2019-10-19T18:54:40Z")

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Well if you do not know what lightmaps are then you should probably first have a look how baked lighting works in unreal.

> **[Lighting the Environment](https://docs.unrealengine.com/4.27/en-US/BuildingWorlds/LightingAndShadows/)**
>
> Using Lighting and shadowing geometry, using Global Illumination, and setting up reflections.

> **[CPU Lightmass Global Illumination](https://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Lightmass/)**
>
> A run down of all the features and settings of Lightmass.

> **[Unwrapping UVs for Lightmaps](https://docs.unrealengine.com/4.27/en-US/WorkingWithContent/Types/StaticMeshes/LightmapUnwrapping/)**
>
> Techniques and guidelines for properly setting up UVs for static meshes

> **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)**
>
> After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — ue4community.wiki! You will be able to find content from the official...

I recommend to have a look at these documents, maybe you find out what your problem is. Otherwise I recommend that you upload your project, or show some pictures of your light properties or the lightmass world settings. Otherwise dignosis will be impossible.

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