# \#Global-Illumination **URL:** https://forums.unrealengine.com/tag/global-illumination/332.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Lightmass fails to build on Apple Silicon Macs in UE 5.6+ when Embree is enabled. ](https://forums.unrealengine.com/t/lightmass-fails-to-build-on-apple-silicon-macs-in-ue-5-6-when-embree-is-enabled/2736545)
**Author:** [@magnuslonngi](https://forums.unrealengine.com/u/magnuslonngi)\ **Replies:** 0\ **Last updated:** [July 18, 2026, 1:12am UTC](https://forums.unrealengine.com/t/lightmass-fails-to-build-on-apple-silicon-macs-in-ue-5-6-when-embree-is-enabled/2736545 "2026-07-18T01:12:32Z")
Summary On Apple Silicon Macs, static lighting builds consistently fail in Unreal Engine 5.6, 5.7, and 5.8 when Embree is enabled. The same project builds successfully in Unreal Engine 5.5.4. Disabling Embree by adding … --- ## [Lumen GI & Reflections in VR](https://forums.unrealengine.com/t/lumen-gi-reflections-in-vr/2709206)
**Author:** [@unrealVR](https://forums.unrealengine.com/u/unrealVR)\ **Replies:** 5\ **Last updated:** [May 28, 2026, 1:00pm UTC](https://forums.unrealengine.com/t/lumen-gi-reflections-in-vr/2709206 "2026-05-28T13:00:16Z")
Unreal Engine 5.7 brings full Lumen Global Illumination and reflections to runtime-generated meshes — even in VR. --- ## [\[5.5.3\] Lumen Bounce Light in SceneCaptureComponent2D ](https://forums.unrealengine.com/t/5-5-3-lumen-bounce-light-in-scenecapturecomponent2d/2707737)
**Author:** [@GlennORU](https://forums.unrealengine.com/u/GlennORU)\ **Replies:** 3\ **Last updated:** [March 24, 2026, 3:22pm UTC](https://forums.unrealengine.com/t/5-5-3-lumen-bounce-light-in-scenecapturecomponent2d/2707737 "2026-03-24T15:22:14Z")
Hi everyone, We’re running UE 5.5.3 in Ubuntu in a projection lab working to get a panoramic display of sorts. For that we’ve split the monitor up into thirds where the main camera renders to the middle third while left… --- ## [Lighting Cinematic Tool 1.0 - Official Release (Free for 2 Weeks)](https://forums.unrealengine.com/t/lighting-cinematic-tool-1-0-official-release-free-for-2-weeks/2698494)
**Author:** [@Argentum\_Studio](https://forums.unrealengine.com/u/Argentum_Studio)\ **Replies:** 2\ **Last updated:** [February 9, 2026, 2:33pm UTC](https://forums.unrealengine.com/t/lighting-cinematic-tool-1-0-official-release-free-for-2-weeks/2698494 "2026-02-09T14:33:14Z")
Lighting Cinematic Tool 1.0 - Official Release (Free for 2 Weeks) Hi everyone, we’re happy to share the release of our new tool for Unreal Engine cinematics - Lighting Cinematic Tool. FAB Release UE5.5+ Lighting Cinem… --- ## [Alternative to Lumen](https://forums.unrealengine.com/t/alternative-to-lumen/2381387)
**Author:** [@B.S.forever](https://forums.unrealengine.com/u/B.S.forever)\ **Replies:** 0\ **Last updated:** [March 8, 2025, 11:06pm UTC](https://forums.unrealengine.com/t/alternative-to-lumen/2381387 "2025-03-08T23:06:40Z")
Why doesn’t Epic Games buy this technology and implement it in UE 5.6 as an additional way of global illumination :smile: (But more optimized as said in the video) It would also be a cleaner way, not noisy lumens. … --- ## [Why are my emmision lights varying in intensity when character or camera moves closer or away](https://forums.unrealengine.com/t/why-are-my-emmision-lights-varying-in-intensity-when-character-or-camera-moves-closer-or-away/686283)
**Author:** [@LukeOUZA](https://forums.unrealengine.com/u/LukeOUZA)\ **Replies:** 4\ **Last updated:** [February 20, 2025, 8:54am UTC](https://forums.unrealengine.com/t/why-are-my-emmision-lights-varying-in-intensity-when-character-or-camera-moves-closer-or-away/686283 "2025-02-20T08:54:02Z")
\[https://vimeo.com/768266611\](https://Video of Issue) Hey guys, new to unreal here: I’m putting together a scene with some wall segments that have emissive materials on them, but for some reason the left side segments … --- ## [HOW CAN I REDUCE THE GLOBAL ILLUMINATION?](https://forums.unrealengine.com/t/how-can-i-reduce-the-global-illumination/2238556)
**Author:** [@krisz\_0325](https://forums.unrealengine.com/u/krisz_0325)\ **Replies:** 1\ **Last updated:** [December 23, 2024, 1:59pm UTC](https://forums.unrealengine.com/t/how-can-i-reduce-the-global-illumination/2238556 "2024-12-23T13:59:31Z")
Hi, I’m trying to reduce my Global Illumination (Lumen) to medium level because I want a performance friendly game. I’m using SM5 DirectX 11 and Lumen for reflections and Gi so I want to reduce the quality of it to get… --- ## [NVRTX 5.0: a review](https://forums.unrealengine.com/t/nvrtx-5-0-a-review/624958)
**Author:** [@jblackwell](https://forums.unrealengine.com/u/jblackwell)\ **Replies:** 12\ **Last updated:** [November 11, 2024, 5:49pm UTC](https://forums.unrealengine.com/t/nvrtx-5-0-a-review/624958 "2024-11-11T17:49:47Z")
This is simply a short review of my time spent experimenting with NVRTX, Nvidia’s enhanced branch of Unreal Engine. Their modifications to UE4 included upgraded RTGI methods and denoisers, their RTXDI light sampling sche… --- ## [Adding a shadow to a texturesample in a material](https://forums.unrealengine.com/t/adding-a-shadow-to-a-texturesample-in-a-material/1840041)
**Author:** [@InnocentPRO](https://forums.unrealengine.com/u/InnocentPRO)\ **Replies:** 0\ **Last updated:** [May 4, 2024, 5:20pm UTC](https://forums.unrealengine.com/t/adding-a-shadow-to-a-texturesample-in-a-material/1840041 "2024-05-04T17:20:25Z")
Hey there, basically, i have a skybox made from a sphere that has a material, that material is composed of 4 texturesamplecube nodes and what it needs to become a skybox. My problem is that some of the skybox textures ar… --- ## [Lumen shadows pop when object comes close](https://forums.unrealengine.com/t/lumen-shadows-pop-when-object-comes-close/1822596)
**Author:** [@broomp4](https://forums.unrealengine.com/u/broomp4)\ **Replies:** 6\ **Last updated:** [April 29, 2024, 10:30am UTC](https://forums.unrealengine.com/t/lumen-shadows-pop-when-object-comes-close/1822596 "2024-04-29T10:30:01Z")
Can anyone tell me why this issue is happening? The lighting and shadows change when objects come to within a certain distance away from the camera. I have virtual shadow maps enabled. I’ve tried all sorts of distance … --- ## [Seams appear in rendered cubemaps](https://forums.unrealengine.com/t/seams-appear-in-rendered-cubemaps/1782360)
**Author:** [@msuleskyp](https://forums.unrealengine.com/u/msuleskyp)\ **Replies:** 5\ **Last updated:** [April 9, 2024, 8:03pm UTC](https://forums.unrealengine.com/t/seams-appear-in-rendered-cubemaps/1782360 "2024-04-09T20:03:26Z")
Hello All! I’m trying to render out a high res 360 render for a virtual meeting space. I tried rendering with panos first, but we couldn’t get high enough render resolution out of them. I’m now trying to render 6 separa… --- ## [Global Illumination Scalability Issues](https://forums.unrealengine.com/t/global-illumination-scalability-issues/1775490)
**Author:** [@Gregory\_Manuel1](https://forums.unrealengine.com/u/Gregory_Manuel1)\ **Replies:** 5\ **Last updated:** [April 4, 2024, 4:42pm UTC](https://forums.unrealengine.com/t/global-illumination-scalability-issues/1775490 "2024-04-04T16:42:02Z")
Hello, So i am having an issue in my interior part of my level. It is supposed to be a dark ice cave illuminated by these glowing rocks you see. On epic and high settings for global illumination i am getting the in… --- ## [Flickering lighting around foliage with Lumen](https://forums.unrealengine.com/t/flickering-lighting-around-foliage-with-lumen/1642155)
**Author:** [@yetmax](https://forums.unrealengine.com/u/yetmax)\ **Replies:** 1\ **Last updated:** [April 4, 2024, 3:01am UTC](https://forums.unrealengine.com/t/flickering-lighting-around-foliage-with-lumen/1642155 "2024-04-04T03:01:18Z")
Hi there! I’m creating a forest environment using Lumen, and I’m having some pretty strong flickering artifacts whenever there are trees around. See for yourselves: The light hitting that window is a directional … --- ## [LightmassReplace node not working with GPU Lightmass?](https://forums.unrealengine.com/t/lightmassreplace-node-not-working-with-gpu-lightmass/550200)
**Author:** [@Pantoth](https://forums.unrealengine.com/u/Pantoth)\ **Replies:** 1\ **Last updated:** [March 8, 2024, 8:28am UTC](https://forums.unrealengine.com/t/lightmassreplace-node-not-working-with-gpu-lightmass/550200 "2024-03-08T08:28:41Z")
Hi everyone! After switching from good old CPU Lightmass to GPU Lightmass (and some tinkering with Luoshuang’s GPU Lightmass) I’m at a point where I’m happy with the result. But what I discovered recently: The really g… --- ## [Lumen - Global illumination inconsistent behaviour](https://forums.unrealengine.com/t/lumen-global-illumination-inconsistent-behaviour/1413571)
**Author:** [@Agint](https://forums.unrealengine.com/u/Agint)\ **Replies:** 0\ **Last updated:** [November 23, 2023, 2:13am UTC](https://forums.unrealengine.com/t/lumen-global-illumination-inconsistent-behaviour/1413571 "2023-11-23T02:13:09Z")
I am getting really inconsistent results when using a camera to fly around some items and buildings. You can see in my demo, that the sides of the cubes are getting darker and brighter when moving the camera. In this th… --- ## [latest UE5 lumen reflection flicker only when playing](https://forums.unrealengine.com/t/latest-ue5-lumen-reflection-flicker-only-when-playing/1356753)
**Author:** [@H4x03D](https://forums.unrealengine.com/u/H4x03D)\ **Replies:** 0\ **Last updated:** [November 1, 2023, 11:31pm UTC](https://forums.unrealengine.com/t/latest-ue5-lumen-reflection-flicker-only-when-playing/1356753 "2023-11-01T23:31:08Z")
Hi! When I have my lumen scene in the viewport, I get no flickering at all. However, when I play the game, I get reflection flickering: The red part flickers fast (in the screenshot I got a half transparent frame… --- ## [Lumen GI behaves in strange way](https://forums.unrealengine.com/t/lumen-gi-behaves-in-strange-way/1226796)
**Author:** [@skokonXD](https://forums.unrealengine.com/u/skokonXD)\ **Replies:** 3\ **Last updated:** [July 13, 2023, 6:25am UTC](https://forums.unrealengine.com/t/lumen-gi-behaves-in-strange-way/1226796 "2023-07-13T06:25:45Z")
Is this normal? I’m using default settings --- ## [Lumen reflections problem when strobe video, latency / refresh rate ?](https://forums.unrealengine.com/t/lumen-reflections-problem-when-strobe-video-latency-refresh-rate/1203398)
**Author:** [@WBDeSportVaL](https://forums.unrealengine.com/u/WBDeSportVaL)\ **Replies:** 2\ **Last updated:** [June 26, 2023, 5:42pm UTC](https://forums.unrealengine.com/t/lumen-reflections-problem-when-strobe-video-latency-refresh-rate/1203398 "2023-06-26T17:42:41Z")
Hello, Here’s my problem. I have integrated a led screen on my stage, but I have a rendering problem with lumen, the reflections don’t load quickly enough and when there are strobes or fast videos the reflections are su… --- ## [Lumen rendering latency / refresh rate in real time ??](https://forums.unrealengine.com/t/lumen-rendering-latency-refresh-rate-in-real-time/1203410)
**Author:** [@WBDeSportVaL](https://forums.unrealengine.com/u/WBDeSportVaL)\ **Replies:** 4\ **Last updated:** [June 21, 2023, 4:24pm UTC](https://forums.unrealengine.com/t/lumen-rendering-latency-refresh-rate-in-real-time/1203410 "2023-06-21T16:24:01Z")
Hello, Here’s my problem. I have integrated a led screen on my stage, but I have a rendering problem with lumen, the reflections don’t load quickly enough and when there are strobes or fast videos the reflections are su… --- ## [Lumen reflections rendering latency / refresh rate in real time ??](https://forums.unrealengine.com/t/lumen-reflections-rendering-latency-refresh-rate-in-real-time/1203578)
**Author:** [@WBDeSportVaL](https://forums.unrealengine.com/u/WBDeSportVaL)\ **Replies:** 1\ **Last updated:** [June 19, 2023, 1:47am UTC](https://forums.unrealengine.com/t/lumen-reflections-rendering-latency-refresh-rate-in-real-time/1203578 "2023-06-19T01:47:04Z")
Hello, Here’s my problem. I have integrated a led screen on my stage, but I have a rendering problem with lumen, the reflections don’t load quickly enough and when there are strobes or fast videos the reflections are su… --- ## [GPU Lightmass in UE 5.2 -- Specify GPU?](https://forums.unrealengine.com/t/gpu-lightmass-in-ue-5-2-specify-gpu/1192174)
**Author:** [@johnb4467](https://forums.unrealengine.com/u/johnb4467)\ **Replies:** 0\ **Last updated:** [June 7, 2023, 10:14pm UTC](https://forums.unrealengine.com/t/gpu-lightmass-in-ue-5-2-specify-gpu/1192174 "2023-06-07T22:14:41Z")
Hi everyone, For reference, this is in UE 5.2. I have a multi-GPU system, with a 2080 and a 1080. I use the 1080 to extend my desktops and route sound to a receiver, but isn’t something I want to use for Unreal. I’ve “… --- ## [\[Bug\] Lumen GI looks more accurate with "Allow Static Lighting" is checked.](https://forums.unrealengine.com/t/bug-lumen-gi-looks-more-accurate-with-allow-static-lighting-is-checked/1107284)
**Author:** [@Ibtesam\_Sadiq](https://forums.unrealengine.com/u/Ibtesam_Sadiq)\ **Replies:** 9\ **Last updated:** [April 19, 2023, 1:09am UTC](https://forums.unrealengine.com/t/bug-lumen-gi-looks-more-accurate-with-allow-static-lighting-is-checked/1107284 "2023-04-19T01:09:02Z")
Hi, I am wondering if Lumen has a bug regarding global illumination because the unreal engine documentation suggests that for Lumen lighting, we should disable the “Allow Static Lighting” option.But global illumination l… --- ## [UE 4.27 - Raytracing, shadow issues with RT shadows off](https://forums.unrealengine.com/t/ue-4-27-raytracing-shadow-issues-with-rt-shadows-off/780294)
**Author:** [@Pandemo](https://forums.unrealengine.com/u/Pandemo)\ **Replies:** 1\ **Last updated:** [April 16, 2023, 8:25pm UTC](https://forums.unrealengine.com/t/ue-4-27-raytracing-shadow-issues-with-rt-shadows-off/780294 "2023-04-16T20:25:04Z")
Hi, I’m trying to utilise RTXGI and raytraced AO for my project. Everything functions as expected including the issues with WPO foliage shadows. However I’m seeing some strange render issues with raytraced AO (I think) … --- ## [Lumen 5.2, anything new, better or broken?](https://forums.unrealengine.com/t/lumen-5-2-anything-new-better-or-broken/836448)
**Author:** [@rsena](https://forums.unrealengine.com/u/rsena)\ **Replies:** 2\ **Last updated:** [April 6, 2023, 2:15am UTC](https://forums.unrealengine.com/t/lumen-5-2-anything-new-better-or-broken/836448 "2023-04-06T02:15:12Z")
Is there any clear info on lumen 5.1 vs 5.2 or notes on 5.2 lumen? I can’t find docs on 5.2 to see what the differences are. Mainly, I am unsure if I should upgrade my 5.1 project to 5.2 for lumen improvements…or just st… --- ## [Shadows are noisy when Screen Space GI is enabled.](https://forums.unrealengine.com/t/shadows-are-noisy-when-screen-space-gi-is-enabled/834522)
**Author:** [@Matrix\_Moddz\_PT1](https://forums.unrealengine.com/u/Matrix_Moddz_PT1)\ **Replies:** 1\ **Last updated:** [March 30, 2023, 7:32pm UTC](https://forums.unrealengine.com/t/shadows-are-noisy-when-screen-space-gi-is-enabled/834522 "2023-03-30T19:32:34Z")
I have been using UE5 for over a year now and I have been struggling to understand how to fix this issue. So whenever I use screen space GI, the shadows become noisy and grainy, if I use other GI options, this issue dis… --- ## [\[BUG\] Realtime Lumen Global Illumination doesn't work well with "Allow Static Lighting" unchecked](https://forums.unrealengine.com/t/bug-realtime-lumen-global-illumination-doesnt-work-well-with-allow-static-lighting-unchecked/793472)
**Author:** [@Ibtesam\_Sadiq](https://forums.unrealengine.com/u/Ibtesam_Sadiq)\ **Replies:** 0\ **Last updated:** [March 18, 2023, 8:43am UTC](https://forums.unrealengine.com/t/bug-realtime-lumen-global-illumination-doesnt-work-well-with-allow-static-lighting-unchecked/793472 "2023-03-18T08:43:01Z")
If I disabled the “Allow Static Lighting” which having lumen enabled in unreal engine 5.1. it makes the shadows extremely dark and global illumination disappeared from most objects specially if I use Quixel Megascans’ as… --- ## [UE5: Lumen + Landscape LOD = unplayable framerates](https://forums.unrealengine.com/t/ue5-lumen-landscape-lod-unplayable-framerates/573583)
**Author:** [@Skowroshima](https://forums.unrealengine.com/u/Skowroshima)\ **Replies:** 18\ **Last updated:** [October 20, 2022, 12:36pm UTC](https://forums.unrealengine.com/t/ue5-lumen-landscape-lod-unplayable-framerates/573583 "2022-10-20T12:36:35Z")
I’ve noticed once I introduced landscapes to my UE5 projects, performance took a huge hit. After spending a large amount of time tweaking all possible settings to distill the source of the slowness, it seems this issue i… --- ## [How does Lumen read objects that are in a blueprint?](https://forums.unrealengine.com/t/how-does-lumen-read-objects-that-are-in-a-blueprint/669236)
**Author:** [@seangraefen](https://forums.unrealengine.com/u/seangraefen)\ **Replies:** 0\ **Last updated:** [October 14, 2022, 6:20am UTC](https://forums.unrealengine.com/t/how-does-lumen-read-objects-that-are-in-a-blueprint/669236 "2022-10-14T06:20:30Z")
Hi y’all, I am currently working with USD Stage Actors that load an entire scene into the engine as one Blueprint. I’ve started to notice that the reflections in my scene were looking really inaccurate, and the Indirect… --- ## [Lumen, is there any setting or console command to boost the emissive contribution?](https://forums.unrealengine.com/t/lumen-is-there-any-setting-or-console-command-to-boost-the-emissive-contribution/631662)
**Author:** [@Altrue](https://forums.unrealengine.com/u/Altrue)\ **Replies:** 3\ **Last updated:** [August 23, 2022, 8:12pm UTC](https://forums.unrealengine.com/t/lumen-is-there-any-setting-or-console-command-to-boost-the-emissive-contribution/631662 "2022-08-23T20:12:19Z")
Hi, I’m going crazy with this. There doesn’t seem to be any way to change the intensity of emissive materials when contributing to lumen. I just want my emissive materials to contribute a bit more to the intensity of t… --- ## [Why Lumen Is Causing Pitch Black Shadows Inside Buildings With Windows](https://forums.unrealengine.com/t/why-lumen-is-causing-pitch-black-shadows-inside-buildings-with-windows/622790)
**Author:** [@J0hn-C0nn0r](https://forums.unrealengine.com/u/J0hn-C0nn0r)\ **Replies:** 14\ **Last updated:** [August 8, 2022, 6:42pm UTC](https://forums.unrealengine.com/t/why-lumen-is-causing-pitch-black-shadows-inside-buildings-with-windows/622790 "2022-08-08T18:42:27Z")
Update: I still haven’t found a solution…I tried several things…this is what I found You can Disable Distance Field Shadows on an object to fix it (Such as removing the window and frame then setting the scale to 0 You … [Next page](https://forums.unrealengine.com/tag/global-illumination/332.md?match_all_tags=true&page=1&tags%5B%5D=Global-Illumination)