# Weird shadows from windows? **URL:** \ **Category:** Rendering\ **Tags:** window, glass, Shadows, lightning, build, unreal-engine, question\ **Created:** [July 21, 2016, 4:02pm UTC](https://forums.unrealengine.com/t/weird-shadows-from-windows/364702 "2016-07-21T16:02:42Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![mateo226](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@mateo226](https://forums.unrealengine.com/u/mateo226)\ **Post date:** [July 21, 2016, 4:02pm UTC](https://forums.unrealengine.com/t/weird-shadows-from-windows/364702/1 "2016-07-21T16:02:42Z")
Hello everyone! This is my first post here so sorry if I posted it in the wrong section… Basically I am new to UE4 and I want to create windows. The problem is that I get weird blocky shadows from my windows. I also get a few warnings when building lightning: **Object has overlapping UVs.** **Lightmap UV are overlapping by 16.3%. Please adjust content - Enable Error Coloring to visualize.** My glass material is from here: My window object: > **[Shower wall first 90 - Koło - Free 3d models - Free 3D Base](https://free3dbase.com/3d-model/shower-wall-first-90/1154/221)** > > Download high quality free 3d models of well-known companies in formats 3ds, dxf, obj. Pobieraj wysokiej jakości darmowe modele 3d produktów znanych firm. And a picture of my problem: ![99344-problem.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/d/1/ed1cd86c2018b81c3f71373827c22966c047a581.png) Any help is appreciated! Thank you very much! EDIT: I just realised this should be in the rendering section… Im really sorry… ---
**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\ **Post date:** [July 21, 2016, 6:18pm UTC](https://forums.unrealengine.com/t/weird-shadows-from-windows/364702/2 "2016-07-21T18:18:40Z")
Hey mateo, I’ve moved the post to the Rendering section for you. Also, you may want to take a look at the Wiki Lighting Troubleshooting Guide for some insight to these types of common issues. Specifically the following ones: - [Overalpping UVs error](https://wiki.unrealengine.com/LightingTroubleshootingGuide#What_is_this_.E2.80.9COverlapping_UV_error.E2.80.9D_non-sense_when_I_build_lighting.3F) - [Lightmap Resolutions](https://wiki.unrealengine.com/LightingTroubleshootingGuide#Lightmap_Resolution_.2F_Shadow_Quality) Between these two sections it should help you resolve your issues. If you’re not sure about lightmapping and how to fix this in a 3D modeling program you can see our documentation linked below for more in-depth details. - [Lightmapping](https://docs.unrealengine.com/latest/INT/Engine/Content/Types/StaticMeshes/LightmapUnwrapping/) I hope this helps. Tim ---
**Author:** ![mateo226](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@mateo226](https://forums.unrealengine.com/u/mateo226)\ **Post date:** [July 21, 2016, 6:29pm UTC](https://forums.unrealengine.com/t/weird-shadows-from-windows/364702/3 "2016-07-21T18:29:07Z")
Thank you very much Tim! I’ve seen a few answers from you before and it seems like you know what youre doing 🙂 I am reading these links as I am writing this and I will post an update after. ---
**Author:** ![mateo226](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@mateo226](https://forums.unrealengine.com/u/mateo226)\ **Post date:** [July 21, 2016, 6:42pm UTC](https://forums.unrealengine.com/t/weird-shadows-from-windows/364702/4 "2016-07-21T18:42:12Z")
I have read all of the provided links… I tried channging the lightmap resolution, I tried changing the build lightning quality, I created the second UV channel about 20 times now. I changed the lightmap index to 1 aswell… Im starting to think UE4 isn’t for me… Lightning is really complicated… I also added another window model to see whether the problem would go away, but it didnt, in fact now it has weird shadows on the border: ![99477-problem2.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/1/4/014a17bbe9c362b7616a42ed23a7448e6b60a973.png) ---
**Author:** ![anonymous\_user\_a43bf927](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_a43bf927](https://forums.unrealengine.com/u/anonymous_user_a43bf927)\ **Post date:** [July 26, 2016, 6:31am UTC](https://forums.unrealengine.com/t/weird-shadows-from-windows/364702/5 "2016-07-26T06:31:09Z")
you must set the lightmass resolution of the floor bigger instead of the window