# \#Lightmap **URL:** https://forums.unrealengine.com/tag/lightmap/1144.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Lightmass not Working In Unreal 5.7 on Mac](https://forums.unrealengine.com/t/lightmass-not-working-in-unreal-5-7-on-mac/2675230)
**Author:** [@ManuMah](https://forums.unrealengine.com/u/ManuMah)\ **Replies:** 5\ **Last updated:** [September 20, 2026, 9:54am UTC](https://forums.unrealengine.com/t/lightmass-not-working-in-unreal-5-7-on-mac/2675230 "2026-09-20T09:54:05Z")
Hi Guys! I have an issue with Lightmass in Unreal engine 5.7, (anything above 5.4.4) on my Mac. I have a 2021 M1 Pro MacBook Pro with 16 GB of shared ram, and it is running MacOS 26.02. When I attempt to build lightin… --- ## [Not all light sources are baked ](https://forums.unrealengine.com/t/not-all-light-sources-are-baked/2733765)
**Author:** [@AlkeyXXX](https://forums.unrealengine.com/u/AlkeyXXX)\ **Replies:** 1\ **Last updated:** [July 8, 2026, 1:43pm UTC](https://forums.unrealengine.com/t/not-all-light-sources-are-baked/2733765 "2026-07-08T13:43:32Z")
I have a level containing only a Skylight (set to Stationary with “Cast Shadows” disabled). Additionally, there are 36 Blueprints in the scene; each consists of a single wall mesh and two Point Lights. In total, there … --- ## [Crashes all the time with lightass scene](https://forums.unrealengine.com/t/crashes-all-the-time-with-lightass-scene/2475603)
**Author:** [@yellowborb](https://forums.unrealengine.com/u/yellowborb)\ **Replies:** 1\ **Last updated:** [June 25, 2026, 7:36pm UTC](https://forums.unrealengine.com/t/crashes-all-the-time-with-lightass-scene/2475603 "2026-06-25T19:36:56Z")
I have an issue that i saw many times in forums and no one seems to have find any solution to it. I have a very simple interior scene, with built/baked shadows and lightmaps. If i press play just after the level have be… --- ## [How can I create a pre-baked lighting room prefab in UE4?](https://forums.unrealengine.com/t/how-can-i-create-a-pre-baked-lighting-room-prefab-in-ue4/2723291)
**Author:** [@xipigta](https://forums.unrealengine.com/u/xipigta)\ **Replies:** 2\ **Last updated:** [June 10, 2026, 1:35pm UTC](https://forums.unrealengine.com/t/how-can-i-create-a-pre-baked-lighting-room-prefab-in-ue4/2723291 "2026-06-10T13:35:56Z")
I’m currently working on a very large-scale environment in UE4. The project requires a huge number of repeated interior rooms/buildings, so I would like to create reusable room prefabs that already contain baked lighting… --- ## [Movable objects turning black when using static lights](https://forums.unrealengine.com/t/movable-objects-turning-black-when-using-static-lights/2723673)
**Author:** [@Divyanshu](https://forums.unrealengine.com/u/Divyanshu)\ **Replies:** 1\ **Last updated:** [May 22, 2026, 6:38am UTC](https://forums.unrealengine.com/t/movable-objects-turning-black-when-using-static-lights/2723673 "2026-05-22T06:38:04Z")
Hello everyone, I am making a horror indoor game in which I am using static lights, but when I am placing the door actors, the frame of the door, which is assigned static, is being lit correctly, but the movable door mes… --- ## [How can I bake lighting for only a small specific area in UE5? ](https://forums.unrealengine.com/t/how-can-i-bake-lighting-for-only-a-small-specific-area-in-ue5/2721518)
**Author:** [@xipigta](https://forums.unrealengine.com/u/xipigta)\ **Replies:** 3\ **Last updated:** [May 15, 2026, 12:26pm UTC](https://forums.unrealengine.com/t/how-can-i-bake-lighting-for-only-a-small-specific-area-in-ue5/2721518 "2026-05-15T12:26:52Z")
I’m currently working on a very large-scale world in UE5, and for performance reasons I decided to use a traditional baked lighting workflow instead of Lumen. For this project, being able to bake lighting for only a sma… --- ## [Android VR project crashes when loading into a level](https://forums.unrealengine.com/t/android-vr-project-crashes-when-loading-into-a-level/2720667)
**Author:** [@OliverWithAnO](https://forums.unrealengine.com/u/OliverWithAnO)\ **Replies:** 0\ **Last updated:** [May 7, 2026, 7:25pm UTC](https://forums.unrealengine.com/t/android-vr-project-crashes-when-loading-into-a-level/2720667 "2026-05-07T19:25:23Z")
Hello, I’m currently working on a port of a VR experience to update the underlying systems and to go from version 5.2 to 5.6 Currently I’m encountering an issue where the packaged project crashes when loading back into… --- ## [Light leaking through mesh imported from Maya (UE5) ](https://forums.unrealengine.com/t/light-leaking-through-mesh-imported-from-maya-ue5/2713418)
**Author:** [@XIIRod](https://forums.unrealengine.com/u/XIIRod)\ **Replies:** 4\ **Last updated:** [April 20, 2026, 6:02am UTC](https://forums.unrealengine.com/t/light-leaking-through-mesh-imported-from-maya-ue5/2713418 "2026-04-20T06:02:58Z")
Hey everyone, I’m having some trouble with light leaking on a model I exported from Maya as an FBX. Texturing went fine, but I’m seeing light hitting areas that should be completely dark. I’m pretty new to Unreal and I… --- ## [Stationary light source does not create static shadows (likely a bug)](https://forums.unrealengine.com/t/stationary-light-source-does-not-create-static-shadows-likely-a-bug/2706187)
**Author:** [@GrigLog](https://forums.unrealengine.com/u/GrigLog)\ **Replies:** 7\ **Last updated:** [March 15, 2026, 3:36pm UTC](https://forums.unrealengine.com/t/stationary-light-source-does-not-create-static-shadows-likely-a-bug/2706187 "2026-03-15T15:36:47Z")
The description of the Stationary type of mobility states that the shadowing of a light source with it must be baked by Lightmass: But as of 5.7.4 (the same issue was present in 5.7.3, by the way), this is not the cas… --- ## [Issue with Lightmaps on VR Quest deploy](https://forums.unrealengine.com/t/issue-with-lightmaps-on-vr-quest-deploy/2705366)
**Author:** [@rickyviking](https://forums.unrealengine.com/u/rickyviking)\ **Replies:** 0\ **Last updated:** [March 11, 2026, 8:57am UTC](https://forums.unrealengine.com/t/issue-with-lightmaps-on-vr-quest-deploy/2705366 "2026-03-11T08:57:50Z")
Hi All, we are having an issue with lightmaps for a VR project that is deployed on Quest standalone (Android). At runtime, when moving the view direction, the lightmaps kind of “switch” to a weird state, as if they were … --- ## [Weird and awful shadows in UE4.27 ](https://forums.unrealengine.com/t/weird-and-awful-shadows-in-ue4-27/2697345)
**Author:** [@KitNight\_off](https://forums.unrealengine.com/u/KitNight_off)\ **Replies:** 2\ **Last updated:** [March 3, 2026, 5:17pm UTC](https://forums.unrealengine.com/t/weird-and-awful-shadows-in-ue4-27/2697345 "2026-03-03T17:17:10Z")
Hi, I’m having a problem with shadows on UE4.27. I made a bedside table mesh in Blender that is a 1k poly model, I’m blocking out my scene and don’t have any textures yet. I baked my lights in production mode, but for s… --- ## [Lightmap discrepancies between DX11 and DX12](https://forums.unrealengine.com/t/lightmap-discrepancies-between-dx11-and-dx12/2701822)
**Author:** [@tpelham42](https://forums.unrealengine.com/u/tpelham42)\ **Replies:** 1\ **Last updated:** [March 3, 2026, 5:06pm UTC](https://forums.unrealengine.com/t/lightmap-discrepancies-between-dx11-and-dx12/2701822 "2026-03-03T17:06:43Z")
I’m using UE5.3 GPU lightmass which bakes great results in DX12, but if I change the RHI to DX11 there are visible seams and other lighting discrepancies. There appears to be light leakage, but if I rebake in DX11 then t… --- ## [Material Error on Startup that I cannot Fix](https://forums.unrealengine.com/t/material-error-on-startup-that-i-cannot-fix/2694344)
**Author:** [@DanielOS96](https://forums.unrealengine.com/u/DanielOS96)\ **Replies:** 1\ **Last updated:** [January 23, 2026, 1:53pm UTC](https://forums.unrealengine.com/t/material-error-on-startup-that-i-cannot-fix/2694344 "2026-01-23T13:53:17Z")
I get this error every time I start the UE5 editor. I have baked a scene with the M\_ProcGrid material so the bUsedWithStaticLighting becomes available, ticked the box so it is on and saved the material. I still get this … --- ## [Why are my lightmaps blotchy and inverted?](https://forums.unrealengine.com/t/why-are-my-lightmaps-blotchy-and-inverted/2689781)
**Author:** [@Anthony\_Attwood](https://forums.unrealengine.com/u/Anthony_Attwood)\ **Replies:** 1\ **Last updated:** [January 5, 2026, 10:09pm UTC](https://forums.unrealengine.com/t/why-are-my-lightmaps-blotchy-and-inverted/2689781 "2026-01-05T22:09:02Z")
Here’s a few screenshots to compare with. The materials here are basic vector 3’s with nothing additional to have them as basic and standard as possible. As you can see, the lightmaps look alright. Despite an odd se… --- ## [lightmass crashing](https://forums.unrealengine.com/t/lightmass-crashing/2555552)
**Author:** [@User-0befe8ef7d](https://forums.unrealengine.com/u/User-0befe8ef7d)\ **Replies:** 10\ **Last updated:** [January 3, 2026, 7:53am UTC](https://forums.unrealengine.com/t/lightmass-crashing/2555552 "2026-01-03T07:53:58Z")
i keep getting this ■■■■ crash i tried to force log and go through every line of the log but couldnt find any fix Assertion failed: TextureUniformBase \[File:D:\\build++UE5\\Sync\\Engine\\Source\\Runtime\\Engine\\Private\\Mater… --- ## [Volumetric Lightmap Streaming Workaround - Multiple VLM - GPU Lightmass Memory Limit](https://forums.unrealengine.com/t/volumetric-lightmap-streaming-workaround-multiple-vlm-gpu-lightmass-memory-limit/746598)
**Author:** [@Kettenotter](https://forums.unrealengine.com/u/Kettenotter)\ **Replies:** 4\ **Last updated:** [December 3, 2025, 4:14pm UTC](https://forums.unrealengine.com/t/volumetric-lightmap-streaming-workaround-multiple-vlm-gpu-lightmass-memory-limit/746598 "2025-12-03T16:14:38Z")
Guide for: Baking and Switching between multiple Volumetric Lightmaps Why? Per Sublevel baking is supported - but when you use volumetric lightmaps you have to bake everything at once - on larger worlds this will increas… --- ## [What is wrong with the shadows? (SpeedTree)](https://forums.unrealengine.com/t/what-is-wrong-with-the-shadows-speedtree/324155)
**Author:** [@Extroding](https://forums.unrealengine.com/u/Extroding)\ **Replies:** 2\ **Last updated:** [October 27, 2025, 3:05pm UTC](https://forums.unrealengine.com/t/what-is-wrong-with-the-shadows-speedtree/324155 "2025-10-27T15:05:20Z")
I have already bought the UE4 SpeedTree subscription and as always it’s happening again. I have these problems on the shadows’s trees as in all the object/3d Models that I tried to introduce into the program. I don’t rea… --- ## [LOD lightmaps](https://forums.unrealengine.com/t/lod-lightmaps/462959)
**Author:** [@Kligan](https://forums.unrealengine.com/u/Kligan)\ **Replies:** 12\ **Last updated:** [October 2, 2025, 3:54pm UTC](https://forums.unrealengine.com/t/lod-lightmaps/462959 "2025-10-02T15:54:54Z")
Is there a way to somehow control lightmap resolution for LODs? I’m so sick of baking light only to find out that there are horrible pop-ins on LODs because their lightmap resolution is so different from each other. For… --- ## [Engine Crashes when encoding Texture after build Lighting](https://forums.unrealengine.com/t/engine-crashes-when-encoding-texture-after-build-lighting/419172)
**Author:** [@mikezen](https://forums.unrealengine.com/u/mikezen)\ **Replies:** 1\ **Last updated:** [August 25, 2025, 9:52am UTC](https://forums.unrealengine.com/t/engine-crashes-when-encoding-texture-after-build-lighting/419172 "2025-08-25T09:52:26Z")
Hello, i get a crash after the lightmaps have been baked at high/Production setting… and it says “encoding textures 49%” lightmass setting : static lighting level scale : 0.5 num indirect light bounces :10 num Sky l… --- ## [Sudden FPS Drop, Shadow Depths Spike, and Nanite/LOD Issues ](https://forums.unrealengine.com/t/sudden-fps-drop-shadow-depths-spike-and-nanite-lod-issues/2650391)
**Author:** [@Utsav138](https://forums.unrealengine.com/u/Utsav138)\ **Replies:** 0\ **Last updated:** [August 23, 2025, 10:21pm UTC](https://forums.unrealengine.com/t/sudden-fps-drop-shadow-depths-spike-and-nanite-lod-issues/2650391 "2025-08-23T22:21:14Z")
Hi, I need some help troubleshooting performance issues in my UE5 project. A few days ago I was getting over 60 FPS, but now I’m only seeing around 20–30 FPS even though I haven’t changed any major settings. Here are the… --- ## [Unreal Lightmass executable is outdated](https://forums.unrealengine.com/t/unreal-lightmass-executable-is-outdated/680381)
**Author:** [@eco\_bach2](https://forums.unrealengine.com/u/eco_bach2)\ **Replies:** 15\ **Last updated:** [August 8, 2025, 2:32pm UTC](https://forums.unrealengine.com/t/unreal-lightmass-executable-is-outdated/680381 "2025-08-08T14:32:06Z")
After doing a custom compile of latest 5.1 preview editor source and trying to build my lighting I get the following warning Warning: Failed to build lighting!!! Unreal Lightmass executable is outdated. Recompile Unreal… --- ## [LOD and Light bake](https://forums.unrealengine.com/t/lod-and-light-bake/2523216)
**Author:** [@Shunitzo](https://forums.unrealengine.com/u/Shunitzo)\ **Replies:** 1\ **Last updated:** [May 24, 2025, 12:59pm UTC](https://forums.unrealengine.com/t/lod-and-light-bake/2523216 "2025-05-24T12:59:11Z")
I have used UE for a few years, but I still can’t comprehend light baking… For some reason LOD 1 to N won’t bake light normaly. LOD 0 looks fine. I use GPU Lightmass, but normal bake gives same results. Any ideas… --- ## [Empty Volumetric Lightmap](https://forums.unrealengine.com/t/empty-volumetric-lightmap/2343304)
**Author:** [@raptorred67](https://forums.unrealengine.com/u/raptorred67)\ **Replies:** 10\ **Last updated:** [April 19, 2025, 9:38pm UTC](https://forums.unrealengine.com/t/empty-volumetric-lightmap/2343304 "2025-04-19T21:38:17Z")
Hello, I am in 5.5 working on a baked-lighting project using the regular Build menu (not GPU Lightmass) and have come up against a weird issue. My volumetric lightmap seems to be completely empty. When I visualize it in… --- ## [GPU Lightmass support for RX7000/RDNA3 GPU's](https://forums.unrealengine.com/t/gpu-lightmass-support-for-rx7000-rdna3-gpus/2450307)
**Author:** [@stormergames001](https://forums.unrealengine.com/u/stormergames001)\ **Replies:** 0\ **Last updated:** [April 10, 2025, 9:33pm UTC](https://forums.unrealengine.com/t/gpu-lightmass-support-for-rx7000-rdna3-gpus/2450307 "2025-04-10T21:33:22Z")
My question is simple, what are the known issues/compatibility for GPU lightmass lightmap baking with AMD RX7000/RDNA3 GPU’s? I am using an RX 7900 XTX and I have had zero success with baking light maps through GPU light… --- ## [Can you expose override lightmap resolution for static meshes to blueprints?](https://forums.unrealengine.com/t/can-you-expose-override-lightmap-resolution-for-static-meshes-to-blueprints/284536)
**Author:** [@HypnoticShark](https://forums.unrealengine.com/u/HypnoticShark)\ **Replies:** 7\ **Last updated:** [March 18, 2025, 7:00am UTC](https://forums.unrealengine.com/t/can-you-expose-override-lightmap-resolution-for-static-meshes-to-blueprints/284536 "2025-03-18T07:00:15Z")
Hello, Can you expose the override lightmap res stuff to blueprints? right now you can only get it but not set it. I would like to set it through the construction script and this is not currently possible :slight\_smile: … --- ## [Weird light behavior in 5.3.2](https://forums.unrealengine.com/t/weird-light-behavior-in-5-3-2/2378269)
**Author:** [@Kratos\_again](https://forums.unrealengine.com/u/Kratos_again)\ **Replies:** 0\ **Last updated:** [March 6, 2025, 6:38pm UTC](https://forums.unrealengine.com/t/weird-light-behavior-in-5-3-2/2378269 "2025-03-06T18:38:29Z")
So I have almost finish my 5.53 arch project when I found out that support for my SDK VR is 5.4, so I decide to downgrade whole project and find out its not possible :smiley: anyway I dedicate my time to unwrap my whole … --- ## [light leak](https://forums.unrealengine.com/t/light-leak/2341490)
**Author:** [@Kratos\_again](https://forums.unrealengine.com/u/Kratos_again)\ **Replies:** 3\ **Last updated:** [February 18, 2025, 9:36am UTC](https://forums.unrealengine.com/t/light-leak/2341490 "2025-02-18T09:36:36Z")
I have this problem with Gpu lightmass and I am not sure how to solve it, light is hiden static, everything is boxed except ceiling but behind ceiling there is another double box ceiling so light doesn’t come from the ba… --- ## [Yet again lightmap issues...](https://forums.unrealengine.com/t/yet-again-lightmap-issues/2338895)
**Author:** [@Kligan](https://forums.unrealengine.com/u/Kligan)\ **Replies:** 0\ **Last updated:** [February 17, 2025, 10:33am UTC](https://forums.unrealengine.com/t/yet-again-lightmap-issues/2338895 "2025-02-17T10:33:32Z")
I was making a modular pipes set, and for some meshes I had to import custom LODs because those generated in-engine changed profile of the mesh too much and lead to visible LOD pop-ins. After finishing everything, setti… --- ## [Change Lightmaps like dynamic materials](https://forums.unrealengine.com/t/change-lightmaps-like-dynamic-materials/346821)
**Author:** [@kbit](https://forums.unrealengine.com/u/kbit)\ **Replies:** 5\ **Last updated:** [February 14, 2025, 2:04pm UTC](https://forums.unrealengine.com/t/change-lightmaps-like-dynamic-materials/346821 "2025-02-14T14:04:02Z")
Lightmaps. Is it possible to change lightmaps in real time like dynamic materials? As far as I know this option is not available in ue4, but is there any workaround? Purpose: need to add or remove objects in environ… --- ## [Lightmap and material](https://forums.unrealengine.com/t/lightmap-and-material/2332487)
**Author:** [@Kratos\_again](https://forums.unrealengine.com/u/Kratos_again)\ **Replies:** 2\ **Last updated:** [February 14, 2025, 1:51pm UTC](https://forums.unrealengine.com/t/lightmap-and-material/2332487 "2025-02-14T13:51:44Z")
I have interactive object where I change material, Lightmaps are build by gpu lightmass. So do I have to build lightmass for every material, because it doesn’t have logic to me, use same lightmass just different material… [Next page](https://forums.unrealengine.com/tag/lightmap/1144.md?match_all_tags=true&page=1&tags%5B%5D=Lightmap)