# Weird lighting issue **URL:** \ **Category:** Rendering\ **Tags:** Shadows, building-lighting, unreal-engine, Rendering, Lighting\ **Created:** [January 22, 2023, 10:33pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929 "2023-01-22T22:33:59Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 22, 2023, 10:33pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/1 "2023-01-22T22:33:59Z")
After light building some of my models have strange shading, as if the UVs are inverted. I’m still a noob in Unreal so I have no idea what the issue could be. ![s03](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/4/d/64d951c93375638d7aaf1d3a934484ebc50adfca.jpeg) ![s04](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/a/d/aad1fe5803c1745099ce7565e1cd666cb2d294d7.jpeg) ![s05](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/8/c/b8c289945344e57be81f01463a516b274831c402.jpeg) ---
**Author:** ![SupportiveEntity](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@SupportiveEntity](https://forums.unrealengine.com/u/SupportiveEntity)\ **Post date:** [January 23, 2023, 1:14am UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/2 "2023-01-23T01:14:20Z")
Hey there @Misstarretje! Could it be that some of the face normals are off? If any of the faces are facing backwards, you can often see this effect! **Disclaimer: One or more of these links are unaffiliated with Epic Games. Epic Games is not liable for anything that may occur outside of this Unreal Engine domain. Please exercise your best judgment when following links outside of the forums.** [![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/c/9/9c9bbaf7d9124ac15bdddb7b4ea39b17f59bed28.jpeg "Use Face Orientation To Locate Incorrect Normals And How To Fix Them - Blender 2.8 Tutorial") ](https://www.youtube.com/watch?v=clzstqtN6YQ) ---
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 29, 2023, 8:13pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/3 "2023-01-29T20:13:56Z")
Thanks for the help! (Sorry for my late reply, though) I did several normal checks in Maya, exported new versions to Unreal but it doesn’t seem to be the problem. When I make a render in Maya, everything looks normal but in Unreal it’s living its own life. ---
**Author:** ![ZacD](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@ZacD](https://forums.unrealengine.com/u/ZacD)\ **Post date:** [January 29, 2023, 8:44pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/4 "2023-01-29T20:44:27Z")
Pretty sure you just need higher resolution light maps. There’s areas where one or two pixels are describing shading on a complex surface. ---
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 29, 2023, 8:54pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/5 "2023-01-29T20:54:16Z")
Hmm okay so I gotta bump it up until the blue areas are turning green? ---
**Author:** ![ZacD](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@ZacD](https://forums.unrealengine.com/u/ZacD)\ **Post date:** [January 29, 2023, 8:56pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/6 "2023-01-29T20:56:36Z")
Try going over kill first and making the green areas red. ---
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 29, 2023, 9:02pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/7 "2023-01-29T21:02:59Z")
![afbeelding](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/5/7/857259750496f95b1c42374bc7eccb0119f23cee.jpeg) The blue edges don’t seem to change at all, that’s pretty weird since the UVs are completely fine ---
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 29, 2023, 9:08pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/8 "2023-01-29T21:08:53Z")
Oh I fixed it! I had to put both lightmap resolutions on 512, even though the thinnest edges still remain blue but it doesn’t give any weird issues now. Thanks for the help guys! ---
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 29, 2023, 11:05pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/9 "2023-01-29T23:05:55Z")
Oops, disregard the last thing I said, the issue is still there ---
**Author:** ![SupportiveEntity](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@SupportiveEntity](https://forums.unrealengine.com/u/SupportiveEntity)\ **Post date:** [January 30, 2023, 1:21am UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/10 "2023-01-30T01:21:10Z")
Oh sorry to hear it didn’t work! Are there overlapping edges/hidden faces? I see the UVs get really tiny at some points. ---
**Author:** ![Misstarretje](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/misstarretje/32/598946_2.png) [@Misstarretje](https://forums.unrealengine.com/u/Misstarretje)\ **Post date:** [January 30, 2023, 8:04pm UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/11 "2023-01-30T20:04:23Z")
The UVs look like this, the big parts overlap because someone told me it’s okay as long as you don’t bake, but maybe that’s why it’s causing issues? ![afbeelding](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/1/c/21cc3f9c6871ceaf4b274af868e88c8d4459567b.png) ![afbeelding](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/f/c/dfcb0d2ed415415cb31957f549d0ccacc285b141.png) ---
**Author:** ![Arkiras](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/arkiras/32/1008648_2.png) [@Arkiras](https://forums.unrealengine.com/u/Arkiras)\ **Post date:** [January 31, 2023, 12:37am UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/12 "2023-01-31T00:37:06Z")
> [@Misstarretje](#): > > someone told me it’s okay as long as you don’t bake, but maybe that’s why it’s causing issues Well… you’re trying to bake. So probably… But if you generated a lightmap UV in unreal (defaults to being put in UV channel 1) then it should remove overlaps when it can I’d also suggest you try moving your lightsources a few cm away from any nearby surfaces, seems like your candle light is really close to the wall which can cause issues with lightmap baking. ---
**Author:** ![SupportiveEntity](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@SupportiveEntity](https://forums.unrealengine.com/u/SupportiveEntity)\ **Post date:** [January 31, 2023, 1:43am UTC](https://forums.unrealengine.com/t/weird-lighting-issue/754929/13 "2023-01-31T01:43:35Z")
I concur with Ark, could be that the light sources. Possibly rebake?