# Lightmap bug ? ugly artefact....

**URL:** <https://forums.unrealengine.com/t/lightmap-bug-ugly-artefact/324502>\
**Category:** Rendering\
**Tags:** unreal-engine, Lightmap, Rendering, question\
**Created:** [July 8, 2015, 1:33pm UTC](https://forums.unrealengine.com/t/lightmap-bug-ugly-artefact/324502 "2015-07-08T13:33:49Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![anonymous\_user\_cc69b907](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_cc69b907](https://forums.unrealengine.com/u/anonymous_user_cc69b907)\
**Post date:** [July 10, 2015, 1:07pm UTC](https://forums.unrealengine.com/t/lightmap-bug-ugly-artefact/324502/6 "2015-07-10T13:07:22Z")

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Hey Alec,

If you scroll up to my answer there is a link to all of the sources for how to set up light map files and the entire process from a modeling program to UE4. I will link it again here.

> **[Understanding Lightmapping in Unreal Engine](https://docs.unrealengine.com/5.1/en-US/understanding-lightmapping-in-unreal-engine/)**
>
> Techniques and guidelines for setting up lightmap UVs for Static Meshes.

Here is also a link to some lightmap troubleshooting.

> **[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 — https://unrealcommunity.wiki/! You will be able to find content from...

Doing some external research and experimenting will help you better understand proper implementation.

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