# Differences in brightness of meshes **URL:** \ **Category:** Rendering\ **Tags:** brightness, lightning, unreal-engine, Rendering, question\ **Created:** [November 9, 2016, 1:10am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806 "2016-11-09T01:10:35Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![RonnyNeumann](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@RonnyNeumann](https://forums.unrealengine.com/u/RonnyNeumann)\ **Post date:** [November 9, 2016, 1:10am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/1 "2016-11-09T01:10:35Z")
Howdy πŸ˜ƒ i tried building a room using some prepared parts i modeled using cinema4D, they are quite simple as you can see and they have the same material (all options are the same too) but i still get those differences in brightness. It would be awesome if someone had an idea how to fix this! πŸ™‚ ![114303-highresscreenshot00000.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/c/e/7ce19ddad366d04dba5a2d57b7f8969a209a79ca.jpeg) ---
**Author:** ![Night\_Watcher](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/night_watcher/32/1145400_2.png) [@Night\_Watcher](https://forums.unrealengine.com/u/Night_Watcher)\ **Post date:** [November 9, 2016, 3:59am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/2 "2016-11-09T03:59:17Z")
I can’t really tell what the issue from just the screenshot. It can be that your wall UV are not using 0 to 1 space, and they are overlapping. Maybe your light is not bouncing properly, did you try to use a skylight? Can you post images of your lighting setup, and you meshes UV? ---
**Author:** ![RonnyNeumann](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@RonnyNeumann](https://forums.unrealengine.com/u/RonnyNeumann)\ **Post date:** [November 9, 2016, 4:23am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/3 "2016-11-09T04:23:28Z")
Hi Night Watcher πŸ™‚ the uvs and the setup should be ok i think: ![114310-uv_001.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/7/b/27bbb26ff59699ddf970663518d01b7ea1c8939b.jpeg) ![114321-uv_002.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/9/2/1925e4f3367a2619d8c21c78edf5007ae22e8030.jpeg) ![114322-setup.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/4/a/e4adb3cd39c2a86a9f6c6a4c10d54345ba49965b.jpeg) I noticed that the error disappears when i adjust the Indirect Lighting cache Quality from ILCQ Point to ILCQ Off. If i change the setting to ILCQ Volume the difference in brightness is far less noticable. Maybe that can help in figuring out the source of the problem and in finding a solution. ![114323-dtile.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/1/d/81d151f6bf7ee96a4274c52959001711dbaf0732.jpeg) Let me know if you need more detailed screenshots of the settings from the lightsources πŸ™‚ ---
**Author:** ![Night\_Watcher](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/night_watcher/32/1145400_2.png) [@Night\_Watcher](https://forums.unrealengine.com/u/Night_Watcher)\ **Post date:** [November 9, 2016, 7:28am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/4 "2016-11-09T07:28:33Z")
Check out this guide to troubleshoot lighting in ue4: > **[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 β€” ue4community.wiki! You will be able to find content from the official... ---
**Author:** ![Night\_Watcher](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/night_watcher/32/1145400_2.png) [@Night\_Watcher](https://forums.unrealengine.com/u/Night_Watcher)\ **Post date:** [November 9, 2016, 7:32am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/5 "2016-11-09T07:32:34Z")
Also what do you mean by difference in brightness, can point out the two areas that have a different brightness? ---
**Author:** ![RonnyNeumann](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@RonnyNeumann](https://forums.unrealengine.com/u/RonnyNeumann)\ **Post date:** [November 9, 2016, 11:21am UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/6 "2016-11-09T11:21:58Z")
Thanks for the link, i will go through it right away πŸ™‚ the two meshes have the same material: ![114336-highresscreenshot00001.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/1/9/c19ba0fc0bb9bc46c614cec277464979b798c644.jpeg) ---
**Author:** ![S-ed](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/s-ed/32/1194558_2.png) [@S-ed](https://forums.unrealengine.com/u/S-ed)\ **Post date:** [November 9, 2016, 12:35pm UTC](https://forums.unrealengine.com/t/differences-in-brightness-of-meshes/375806/7 "2016-11-09T12:35:48Z")
Looks like a ligthmap issue. Have You looked in Unlit mode? > **[Modular Asset Lighting Problem](https://forums.unrealengine.com/showthread.php?46269-Modular-Asset-Lighting-Problem)** > > Hello all! I just started working on my first set of modular assets (which are primarily different sized tiles) and I’ve gotten them to fit correctly and everything but now the problem is lighting. It is being lit differently on some tiles. Also,...