# Building Lighting turns objects black. Again **URL:** \ **Category:** Rendering\ **Tags:** building-lighting, unreal-engine\ **Created:** [May 20, 2022, 9:01am UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808 "2022-05-20T09:01:47Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Last\_Farmer](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/last_farmer/32/906838_2.png) [@Last\_Farmer](https://forums.unrealengine.com/u/Last_Farmer)\ **Post date:** [May 20, 2022, 9:01am UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/1 "2022-05-20T09:01:47Z")
Hi. Well, I have created just a simple room, but the damned light building turns everything black even if… - Meshes are imported form Maya as .FBX -They have normals facing out. - And they have UVs (channel 0) - The applied material is just a colored surface and nothing more. - Meshes and lights are set as Static. - The scene scale is right (no weird sizes) Has anyone ever found a solution to this baking issue that seems to emerge year after year on different forums like a divine punishment ? Thank you. ![005_LightingInterior_C_error](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/3/2/13298b1994431ae48cb873e1351a3b6217ab7e3c.jpeg) ---
**Author:** ![anonymous\_user\_f26c856c1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_f26c856c1](https://forums.unrealengine.com/u/anonymous_user_f26c856c1)\ **Post date:** [May 21, 2022, 3:05pm UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/2 "2022-05-21T15:05:16Z")
Hi! Ususally (99%?) when objects turn black is a lightmap issue!! Are you sure you are using the correct uv channel for the lighting? Could you show the uv you are using for the lightmap? ---
**Author:** ![Last\_Farmer](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/last_farmer/32/906838_2.png) [@Last\_Farmer](https://forums.unrealengine.com/u/Last_Farmer)\ **Post date:** [May 21, 2022, 3:47pm UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/3 "2022-05-21T15:47:21Z")
Hi Maklgirl. The Uvs I’m using are quite simple: the geometries are just boxes and I have 2 channel: Channel 0: the original. Channel 1: generated automatically by the building (but I tried to import objects with 2 UV channel defined manually as well). Here they are… (I’m using Unreal 5) Thank you. ![005_LightingInterior_C_errorB](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/0/2/802b9ee0882118b346d2f5eeec9bba75b27e2a3b.jpeg) ---
**Author:** ![Last\_Farmer](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/last_farmer/32/906838_2.png) [@Last\_Farmer](https://forums.unrealengine.com/u/Last_Farmer)\ **Post date:** [May 23, 2022, 9:51am UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/4 "2022-05-23T09:51:40Z")
Problem solved !! The issue was given by the Lumen system in UE5. It doesn’t support light baking and disable all lightmaps !! ![Lumen](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/9/e/79ee2b2587148e5d3d8c019872c4ebe40be595cc.jpeg) ---
**Author:** ![disdrei](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@disdrei](https://forums.unrealengine.com/u/disdrei)\ **Post date:** [July 20, 2022, 4:11am UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/5 "2022-07-20T04:11:08Z")
so how did you deactivate? im new to unreal and keep getting stuck on this with all baking. thank you ---
**Author:** ![Last\_Farmer](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/last_farmer/32/906838_2.png) [@Last\_Farmer](https://forums.unrealengine.com/u/Last_Farmer)\ **Post date:** [July 20, 2022, 8:07am UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/6 "2022-07-20T08:07:51Z")
Just go on Project Settings and turn on the Lumen in the Lighting section. Ehe traditional light baking willl turn off automatically. ---
**Author:** ![Nariman\_Rafati](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/nariman_rafati/32/771896_2.png) [@Nariman\_Rafati](https://forums.unrealengine.com/u/Nariman_Rafati)\ **Post date:** [November 7, 2023, 4:02pm UTC](https://forums.unrealengine.com/t/building-lighting-turns-objects-black-again/561808/7 "2023-11-07T16:02:58Z")
Hi, I am new and I have the same problem. Could you address it more specifically? We should go to the rendering tab and change the Light Units? Also, changing Dynamic Global Illumination Method and Reflection Method? Also, do you know the differences between Build Lighting and Bake GPU Lighting? This is a project in which everything is static and only lights are changing in different scenarios. Then participants will experience it through VR. Best, Nariman