# Lights not building right? **URL:** \ **Category:** Rendering\ **Tags:** building-lighting, light, lighting-scenarios, light-build, unreal-engine, Lighting, question\ **Created:** [October 18, 2019, 11:09pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143 "2019-10-18T23:09:00Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![TuXsOrDs](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TuXsOrDs](https://forums.unrealengine.com/u/TuXsOrDs)\ **Post date:** [October 18, 2019, 11:09pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/1 "2019-10-18T23:09:00Z")
Im making a low poly scene and made some jack o lanterns with lights in them as seen here: ![290454-before-light-build.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/5/d/b5d6dfa59ebb638ee04796551b2cd213da861c7e.jpeg) So I have the little “Preview” because i haven’t built the lighting yet. Once I build the lighting I get this: ![290455-after-lighting-build.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/6/d/a6df3eb7e02a8520b94a1b7d90a6700a0c451563.jpeg) I dot want it to look like the second picture after I build the geometry and lighting. I like the glow in the pumkins and the light coming from them on the ground. Is there something I can do to prevent this from happening? ---
**Author:** ![Dividuum](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/dividuum/32/748742_2.png) [@Dividuum](https://forums.unrealengine.com/u/Dividuum)\ **Post date:** [October 19, 2019, 11:18am UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/2 "2019-10-19T11:18:08Z")
Hi there! Are the lights set to stationary and geo set to static? You made sure this is not a lightmap issue? Stationary Light Overlap looks fine? Are you receiving any errors? ---
**Author:** ![Blackforcedragon](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/blackforcedragon/32/1010299_2.png) [@Blackforcedragon](https://forums.unrealengine.com/u/Blackforcedragon)\ **Post date:** [October 19, 2019, 2:01pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/3 "2019-10-19T14:01:15Z")
You need to use a convexity map, it is a pink and whit texture, and you need to sett the material in lit like this: ![290488-h2.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/7/8/878a3d1e84abe94af1e56b959f0a2f54eeba6e2a.png) ---
**Author:** ![TuXsOrDs](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TuXsOrDs](https://forums.unrealengine.com/u/TuXsOrDs)\ **Post date:** [October 19, 2019, 2:28pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/4 "2019-10-19T14:28:40Z")
I’m fairly new to lighting in UE4 but I didn’t receive any errors. ---
**Author:** ![TuXsOrDs](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TuXsOrDs](https://forums.unrealengine.com/u/TuXsOrDs)\ **Post date:** [October 19, 2019, 2:29pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/5 "2019-10-19T14:29:55Z")
Where would I apply this material? I’m Slightly confused I am fairly new to lighting in UE4 ---
**Author:** ![Blackforcedragon](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/blackforcedragon/32/1010299_2.png) [@Blackforcedragon](https://forums.unrealengine.com/u/Blackforcedragon)\ **Post date:** [October 19, 2019, 2:45pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/6 "2019-10-19T14:45:21Z")
the Ambient Oculus texture give you the colors for your object the convexity map will give you the light, you need to make the convexity map and make it white where you want light to show. try whit this texture on a cube if you want: ![290490-h3.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/5/0/9505a3346bb4bae08b72118a78bc3df3b5f6d34d.png) ---
**Author:** ![Blackforcedragon](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/blackforcedragon/32/1010299_2.png) [@Blackforcedragon](https://forums.unrealengine.com/u/Blackforcedragon)\ **Post date:** [October 19, 2019, 4:43pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/7 "2019-10-19T16:43:38Z")
you conect the convexity map and a vector 3 to a multiplayer, then conect it to Emissive color. like in the image I send you. ---
**Author:** ![Dividuum](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/dividuum/32/748742_2.png) [@Dividuum](https://forums.unrealengine.com/u/Dividuum)\ **Post date:** [October 19, 2019, 6:47pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/8 "2019-10-19T18:47:35Z")
If I get you right you want to make the inside of the pumpkin emissive? It’s a work around, but will probably not fix the lighting issue outside of the pumpkin. ---
**Author:** ![Dividuum](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/dividuum/32/748742_2.png) [@Dividuum](https://forums.unrealengine.com/u/Dividuum)\ **Post date:** [October 19, 2019, 6:54pm UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/9 "2019-10-19T18:54:40Z")
Well if you do not know what lightmaps are then you should probably first have a look how baked lighting works in unreal. > **[Lighting the Environment](https://docs.unrealengine.com/4.27/en-US/BuildingWorlds/LightingAndShadows/)** > > Using Lighting and shadowing geometry, using Global Illumination, and setting up reflections. > **[CPU Lightmass Global Illumination](https://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Lightmass/)** > > A run down of all the features and settings of Lightmass. > **[Unwrapping UVs for Lightmaps](https://docs.unrealengine.com/4.27/en-US/WorkingWithContent/Types/StaticMeshes/LightmapUnwrapping/)** > > Techniques and guidelines for properly setting up UVs for static meshes > **[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 — ue4community.wiki! You will be able to find content from the official... I recommend to have a look at these documents, maybe you find out what your problem is. Otherwise I recommend that you upload your project, or show some pictures of your light properties or the lightmass world settings. Otherwise dignosis will be impossible. ---
**Author:** ![TuXsOrDs](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TuXsOrDs](https://forums.unrealengine.com/u/TuXsOrDs)\ **Post date:** [October 20, 2019, 1:33am UTC](https://forums.unrealengine.com/t/lights-not-building-right/457143/10 "2019-10-20T01:33:29Z")
I put a point light inside the pumpkin and I wanted that to be the light.