# \#Lumen **URL:** https://forums.unrealengine.com/tag/lumen/30.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Lumen GI and Reflections feedback thread](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108)
**Author:** [@Daniel\_Wright](https://forums.unrealengine.com/u/Daniel_Wright)\ **Replies:** 2381\ **Last updated:** [November 6, 2026, 7:10am UTC](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108 "2026-11-06T07:10:39Z")
Hi everyone, I’m starting this thread for feedback and discussion about Lumen GI and Reflections in UE5. We’re under a lot of pressure with internal deadlines so can’t promise responses, but we will read everything here… --- ## [Trying to optimize hardware Lumen Reflections with Nsight Graphics](https://forums.unrealengine.com/t/trying-to-optimize-hardware-lumen-reflections-with-nsight-graphics/2848776)
**Author:** [@Yuri9447](https://forums.unrealengine.com/u/Yuri9447)\ **Replies:** 0\ **Last updated:** [November 2, 2026, 8:26am UTC](https://forums.unrealengine.com/t/trying-to-optimize-hardware-lumen-reflections-with-nsight-graphics/2848776 "2026-11-02T08:26:08Z")
Hi, I’m using Nsight Graphics 26.3 to optimize hardware lumen reflections. When captured a frame and located to lumen reflection region, I noticed that the Ray Tracing Traversal function is taking most of the total sampl… --- ## [Visible splits in lumen reflections(the rendered frame) when using large screenpercentage](https://forums.unrealengine.com/t/visible-splits-in-lumen-reflections-the-rendered-frame-when-using-large-screenpercentage/2794435)
**Author:** [@Yuri9447](https://forums.unrealengine.com/u/Yuri9447)\ **Replies:** 6\ **Last updated:** [October 27, 2026, 6:57pm UTC](https://forums.unrealengine.com/t/visible-splits-in-lumen-reflections-the-rendered-frame-when-using-large-screenpercentage/2794435 "2026-10-27T18:57:30Z")
Hi, Everyone. I noticed that if you settting r.ScreenPercentage to a very large value(in my case 200), and you enabled Lumen reflections and hardware raytracing, there will be visible split lines across the rendered fram… --- ## [UE 5.8 – Skeletal Meshes lose shadows with MegaLights at GI Medium (fix)](https://forums.unrealengine.com/t/ue-5-8-skeletal-meshes-lose-shadows-with-megalights-at-gi-medium-fix/2840756)
**Author:** [@3th3r](https://forums.unrealengine.com/u/3th3r)\ **Replies:** 0\ **Last updated:** [October 15, 2026, 12:22pm UTC](https://forums.unrealengine.com/t/ue-5-8-skeletal-meshes-lose-shadows-with-megalights-at-gi-medium-fix/2840756 "2026-10-15T12:22:56Z")
Title: UE 5.8 – Skeletal Meshes lose shadows with MegaLights at GI Medium (fix) In UE 5.8, Epic added some new CVars to the scalability settings. As a result, Skeletal Meshes are no longer represented in the Global Illu… --- ## [Lumen not turning on in 5.5-5.8, but works fine in 5.0 ](https://forums.unrealengine.com/t/lumen-not-turning-on-in-5-5-5-8-but-works-fine-in-5-0/2725383)
**Author:** [@Cold\_In\_July](https://forums.unrealengine.com/u/Cold_In_July)\ **Replies:** 2\ **Last updated:** [October 15, 2026, 8:40am UTC](https://forums.unrealengine.com/t/lumen-not-turning-on-in-5-5-5-8-but-works-fine-in-5-0/2725383 "2026-10-15T08:40:16Z")
hello everyone! I have issue turn on Lumen, for some reason its worked pefectly in 5.0, I turned it on according tutorials, but in 5.6-5.8 version its not working, when I switch from Lit to Lumen its said its disabled. S… --- ## [\[UE 5.8.3\]\[Lumen\] Broad interior light leakage in a sealed stock-cube room with Screen Probe Gather](https://forums.unrealengine.com/t/ue-5-8-3-lumen-broad-interior-light-leakage-in-a-sealed-stock-cube-room-with-screen-probe-gather/2839515)
**Author:** [@SilentGarud](https://forums.unrealengine.com/u/SilentGarud)\ **Replies:** 0\ **Last updated:** [October 11, 2026, 2:51pm UTC](https://forums.unrealengine.com/t/ue-5-8-3-lumen-broad-interior-light-leakage-in-a-sealed-stock-cube-room-with-screen-probe-gather/2839515 "2026-10-11T14:51:48Z")
Summary I reproduced broad interior wall illumination in a fresh Blank Blueprint project using six overlapping opaque stock Cube meshes and one exterior Directional Light. The closed room has no skylight, atmosphere, fog… --- ## [5.8 Lumen disables Planar Reflection?](https://forums.unrealengine.com/t/5-8-lumen-disables-planar-reflection/2836791)
**Author:** [@Cronoss95](https://forums.unrealengine.com/u/Cronoss95)\ **Replies:** 3\ **Last updated:** [October 7, 2026, 2:14pm UTC](https://forums.unrealengine.com/t/5-8-lumen-disables-planar-reflection/2836791 "2026-10-07T14:14:46Z")
Hi! Sorry for the longer post, but I wasnt able to determine a solution via AI and I hope someone here maybe knows the solution. I tried to upgrade my project from 5.7 to 5.8. My scene uses planar reflection in the mai… --- ## [Lumen HWRT GPU page fault: persistent SBT / RayTracingSceneMetadata reference s a released index buffer](https://forums.unrealengine.com/t/lumen-hwrt-gpu-page-fault-persistent-sbt-raytracingscenemetadata-reference-s-a-released-index-buffer/2838275)
**Author:** [@Gamelp\_01](https://forums.unrealengine.com/u/Gamelp_01)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 1:26pm UTC](https://forums.unrealengine.com/t/lumen-hwrt-gpu-page-fault-persistent-sbt-raytracingscenemetadata-reference-s-a-released-index-buffer/2838275 "2026-10-07T13:26:06Z")
Summary I’m using “Lumen Hardware Raytracing” and disabled “Generate Mesh Distance Fields” and had a lot of GPU crashes in the editor and in standalone game/shipping build. This all of information I gathered from AI anal… --- ## [5.8 Lumen Overwrites Planar Reflection Actor](https://forums.unrealengine.com/t/5-8-lumen-overwrites-planar-reflection-actor/2836896)
**Author:** [@Cronoss95](https://forums.unrealengine.com/u/Cronoss95)\ **Replies:** 0\ **Last updated:** [October 3, 2026, 1:37pm UTC](https://forums.unrealengine.com/t/5-8-lumen-overwrites-planar-reflection-actor/2836896 "2026-10-03T13:37:33Z")
Summary In 5.8, a Planar Reflection actor renders no reflection when Lumen Global Illumination is active, even with Reflections Method set to None. The same setup works in 5.7. With only the planar actor placed (no Post… --- ## [Lumen Medium causing black flickering artefacts](https://forums.unrealengine.com/t/lumen-medium-causing-black-flickering-artefacts/2798205)
**Author:** [@Glenn\_Donaldson1](https://forums.unrealengine.com/u/Glenn_Donaldson1)\ **Replies:** 0\ **Last updated:** [September 17, 2026, 2:27pm UTC](https://forums.unrealengine.com/t/lumen-medium-causing-black-flickering-artefacts/2798205 "2026-09-17T14:27:18Z")
Summary When the cube floor model is at exactly world origin 0,0,0 and the top face of the floor is at zero. Then you will get this black flickering occurring when using lumen medium specifically. If the floor is moved u… --- ## [Echoes of the Lost - solo-developed survival horror in UE 5.8](https://forums.unrealengine.com/t/echoes-of-the-lost-solo-developed-survival-horror-in-ue-5-8/2794440)
**Author:** [@SLM\_CryNet](https://forums.unrealengine.com/u/SLM_CryNet)\ **Replies:** 0\ **Last updated:** [September 17, 2026, 7:36am UTC](https://forums.unrealengine.com/t/echoes-of-the-lost-solo-developed-survival-horror-in-ue-5-8/2794440 "2026-09-17T07:36:34Z")
Hi everyone! I’d like to share Echoes of the Lost, a single-player cinematic survival horror I’m developing solo, part-time, in Unreal Engine 5.8. The Steam page is now live, and I’ve put together an announcement teaser… --- ## [Echoes of the Lost - solo-developed survival horror in UE 5.8 (Lumen, no Nanite)](https://forums.unrealengine.com/t/echoes-of-the-lost-solo-developed-survival-horror-in-ue-5-8-lumen-no-nanite/2776241)
**Author:** [@SLM\_CryNet](https://forums.unrealengine.com/u/SLM_CryNet)\ **Replies:** 0\ **Last updated:** [September 16, 2026, 1:20pm UTC](https://forums.unrealengine.com/t/echoes-of-the-lost-solo-developed-survival-horror-in-ue-5-8-lumen-no-nanite/2776241 "2026-09-16T13:20:59Z")
Hi everyone! I’d like to share Echoes of the Lost, a single-player cinematic survival horror I’m developing solo, part-time, in Unreal Engine 5.8. The Steam page is now live, and I’ve put together an announcement teaser… --- ## [Lumen And SceneCapture2D (UE5)](https://forums.unrealengine.com/t/lumen-and-scenecapture2d-ue5/2711389)
**Author:** [@Nizami\_Nz](https://forums.unrealengine.com/u/Nizami_Nz)\ **Replies:** 1\ **Last updated:** [September 9, 2026, 1:42am UTC](https://forums.unrealengine.com/t/lumen-and-scenecapture2d-ue5/2711389 "2026-09-09T01:42:39Z")
If anyone has encountered a problem where SceneCaptureComponent2D displays an incorrect image (without Lumen), here is the solution: Enable Global Illumination Method → Lumen (even if it’s already set in the global se… --- ## [UE 5.7.4 Lumen HWRT Inline RayTracing GPU Page Fault during Streaming / Geometry Lifetime Changes ](https://forums.unrealengine.com/t/ue-5-7-4-lumen-hwrt-inline-raytracing-gpu-page-fault-during-streaming-geometry-lifetime-changes/2762741)
**Author:** [@MistletoeGQ](https://forums.unrealengine.com/u/MistletoeGQ)\ **Replies:** 1\ **Last updated:** [September 8, 2026, 9:57am UTC](https://forums.unrealengine.com/t/ue-5-7-4-lumen-hwrt-inline-raytracing-gpu-page-fault-during-streaming-geometry-lifetime-changes/2762741 "2026-09-08T09:57:56Z")
We are investigating a recurring GPU crash in UE 5.7.4 with Lumen Hardware Ray Tracing using the Inline Ray Tracing path. The crash occurs inside Lumen HWRT compute shaders, most notably: LumenRadiosityHardwareRayTraci… --- ## [UE5.7 - Fix: Lumen not working for SM5 DX11 and DX12](https://forums.unrealengine.com/t/ue5-7-fix-lumen-not-working-for-sm5-dx11-and-dx12/2676047)
**Author:** [@Uno1982](https://forums.unrealengine.com/u/Uno1982)\ **Replies:** 4\ **Last updated:** [September 4, 2026, 4:24pm UTC](https://forums.unrealengine.com/t/ue5-7-fix-lumen-not-working-for-sm5-dx11-and-dx12/2676047 "2026-09-04T16:24:22Z")
When using the cvar r.Lumen.Supported.SM5=1 which was working fine in 5.6 … UE5.7 presents with the following in DX11 and DX12 SM5 https://github.com/uno1982/UnrealEngine/tree/5.7-Lumen-D3D-SM5-Fix Fix: Restore Lume… --- ## [Tutorial: Lifelike Outdoor Lighting in 5 minutes \[Youtube\]](https://forums.unrealengine.com/t/tutorial-lifelike-outdoor-lighting-in-5-minutes-youtube/1872655)
**Author:** [@Hotsun](https://forums.unrealengine.com/u/Hotsun)\ **Replies:** 1\ **Last updated:** [August 20, 2026, 4:22pm UTC](https://forums.unrealengine.com/t/tutorial-lifelike-outdoor-lighting-in-5-minutes-youtube/1872655 "2026-08-20T16:22:12Z")
Hi, I made a tutorial to show you how to achieve lifelike outdoor lighting in 5 minutes without any plugins. Enjoy. --- ## [Benefits of Physically Based Lighting Values vs. Game-Scaled Values in UE5](https://forums.unrealengine.com/t/benefits-of-physically-based-lighting-values-vs-game-scaled-values-in-ue5/2743798)
**Author:** [@eunseolkim](https://forums.unrealengine.com/u/eunseolkim)\ **Replies:** 0\ **Last updated:** [August 14, 2026, 2:17pm UTC](https://forums.unrealengine.com/t/benefits-of-physically-based-lighting-values-vs-game-scaled-values-in-ue5/2743798 "2026-08-14T14:17:41Z")
Hi, I’m currently evaluating a physically based lighting workflow in UE5 and would like to understand what practical benefits it offers compared with using lower, game-scaled lighting values. My goal is not strict 1:1 … --- ## [How to fix lumen flickering issue without anti aliasing?](https://forums.unrealengine.com/t/how-to-fix-lumen-flickering-issue-without-anti-aliasing/2743053)
**Author:** [@Leonature](https://forums.unrealengine.com/u/Leonature)\ **Replies:** 1\ **Last updated:** [August 12, 2026, 10:37am UTC](https://forums.unrealengine.com/t/how-to-fix-lumen-flickering-issue-without-anti-aliasing/2743053 "2026-08-12T10:37:22Z")
I’m trying to make lumen work with my artstyle but the solutions I’ve searched to fix the lumen flickering are with using TSR anti aliasing. Unfortunately anti aliasing doesn’t work with my pixelated artstyle. (I’m… --- ## [UE 5.8.0 - blank + openXR plugin + instanced stereo = instant crash in VR](https://forums.unrealengine.com/t/ue-5-8-0-blank-openxr-plugin-instanced-stereo-instant-crash-in-vr/2735638)
**Author:** [@maxbrown](https://forums.unrealengine.com/u/maxbrown)\ **Replies:** 7\ **Last updated:** [August 9, 2026, 3:25pm UTC](https://forums.unrealengine.com/t/ue-5-8-0-blank-openxr-plugin-instanced-stereo-instant-crash-in-vr/2735638 "2026-08-09T15:25:44Z")
Summary instant crash when running instanced stereo + on blank (lumen) project What Type of Bug are you experiencing? Platform Other Steps to Reproduce create blank project enable openXR add some content + vrPawn play… --- ## [Black geometry in mirror kaleidoscope with Lumen Reflections](https://forums.unrealengine.com/t/black-geometry-in-mirror-kaleidoscope-with-lumen-reflections/2736172)
**Author:** [@ACHEU](https://forums.unrealengine.com/u/ACHEU)\ **Replies:** 1\ **Last updated:** [July 17, 2026, 1:14pm UTC](https://forums.unrealengine.com/t/black-geometry-in-mirror-kaleidoscope-with-lumen-reflections/2736172 "2026-07-17T13:14:48Z")
I am trying to render out a parametric kaleidoscope of mirrored surfaces reflecting some emissive video textures and it seems to work at some angles but as you can see im getting these black reflections of geometry. Ray … --- ## [Raghava Halo | Interactive Real Estate Sales Experience | Unreal Engine 5.6 | Pixel Streaming ](https://forums.unrealengine.com/t/raghava-halo-interactive-real-estate-sales-experience-unreal-engine-5-6-pixel-streaming/2735885)
**Author:** [@Surbhi\_Infotech](https://forums.unrealengine.com/u/Surbhi_Infotech)\ **Replies:** 0\ **Last updated:** [July 15, 2026, 1:06pm UTC](https://forums.unrealengine.com/t/raghava-halo-interactive-real-estate-sales-experience-unreal-engine-5-6-pixel-streaming/2735885 "2026-07-15T13:06:13Z")
Hello Unreal Engine Community, We are Surbhi Infotech, a PropTech company from India specializing in interactive real estate experiences powered by Unreal Engine. We’re excited to share one of our latest… --- ## [Lumen no longer working in UE5.5 DX11 SM5](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402)
**Author:** [@Uno1982](https://forums.unrealengine.com/u/Uno1982)\ **Replies:** 28\ **Last updated:** [July 5, 2026, 6:27pm UTC](https://forums.unrealengine.com/t/lumen-no-longer-working-in-ue5-5-dx11-sm5/2126402 "2026-07-05T18:27:05Z")
UE5.4 Lumen working with DX11 and SM5 which was an really fast and awesome pipeline for non nanite traditional LODs and lower end hardware 120FPS Default settings other than DX11 and SM5 (would be more but im capped … --- ## [How come some games are seen as extremely realistic, like Silent Breath? ](https://forums.unrealengine.com/t/how-come-some-games-are-seen-as-extremely-realistic-like-silent-breath/2725652)
**Author:** [@GuillotineStudio](https://forums.unrealengine.com/u/GuillotineStudio)\ **Replies:** 13\ **Last updated:** [June 4, 2026, 9:51am UTC](https://forums.unrealengine.com/t/how-come-some-games-are-seen-as-extremely-realistic-like-silent-breath/2725652 "2026-06-04T09:51:00Z")
I have been trying to create graphics similar to Silent Breath for almost 2 years in my project. I bought and used the exact same assets that Silent Breath used, such as the UDS and the forest that Silent Breath used. Bu… --- ## [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. --- ## [Foliage Grass flickering in the shadow UE5 Lumen](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118)
**Author:** [@jjhuang](https://forums.unrealengine.com/u/jjhuang)\ **Replies:** 14\ **Last updated:** [May 27, 2026, 7:27pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118 "2026-05-27T19:27:58Z")
How to solve this problem ? Lowpoly grass ? mesh Not visible form Lumen GI ? or Any settings I would like to try --- ## [Virtual Shadow Map Blocky Flickering UE 5.3.2](https://forums.unrealengine.com/t/virtual-shadow-map-blocky-flickering-ue-5-3-2/2562800)
**Author:** [@olegwer1](https://forums.unrealengine.com/u/olegwer1)\ **Replies:** 6\ **Last updated:** [May 20, 2026, 8:44am UTC](https://forums.unrealengine.com/t/virtual-shadow-map-blocky-flickering-ue-5-3-2/2562800 "2026-05-20T08:44:13Z")
https://youtu.be/Knlis2jOzZw An interior scene. Same on the viewport and Rendering. When I change shadows to ‘Shadow Map’ mode - there is no flickering. I tried to increase Lumen samples - no effect. Any idea how to ke… --- ## [Why does Lumen produce different initial lighting results when reopening an Unreal Engine project? ](https://forums.unrealengine.com/t/why-does-lumen-produce-different-initial-lighting-results-when-reopening-an-unreal-engine-project/2715902)
**Author:** [@FistOfFury1](https://forums.unrealengine.com/u/FistOfFury1)\ **Replies:** 5\ **Last updated:** [April 20, 2026, 1:26pm UTC](https://forums.unrealengine.com/t/why-does-lumen-produce-different-initial-lighting-results-when-reopening-an-unreal-engine-project/2715902 "2026-04-20T13:26:49Z")
When I first import a Datasmith file into my UE5 scene, the result looks like Picture 1: the lighting, shadows, and AO are extremely rich and heavy, almost like a cinematic photograph. The scene has very clear depth info… --- ## [SJOR - Film | UE 5.5 | Lumen](https://forums.unrealengine.com/t/sjor-film-ue-5-5-lumen/2715556)
**Author:** [@Antonisfyl](https://forums.unrealengine.com/u/Antonisfyl)\ **Replies:** 0\ **Last updated:** [April 15, 2026, 1:23pm UTC](https://forums.unrealengine.com/t/sjor-film-ue-5-5-lumen/2715556 "2026-04-15T13:23:05Z")
Hi guys, super excited to finally share the full film with you. For the past year, my brother and I have been creating a cinematic universe with a unique world and characters. Every character, every action, every shot, … --- ## [UE 5.5 - Heavy ghosting offset of my moving object](https://forums.unrealengine.com/t/ue-5-5-heavy-ghosting-offset-of-my-moving-object/2445296)
**Author:** [@Pataloon](https://forums.unrealengine.com/u/Pataloon)\ **Replies:** 4\ **Last updated:** [March 25, 2026, 2:07am UTC](https://forums.unrealengine.com/t/ue-5-5-heavy-ghosting-offset-of-my-moving-object/2445296 "2026-03-25T02:07:28Z")
Hi! I have an issue with my current project, a have huge ghosting visible on the right of any moving element, see for yourself. I tried all the Anti Aliasing methods and there is still that weird thing. Thank yo… --- ## [\[5.5.3\] 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… [Next page](https://forums.unrealengine.com/tag/lumen/30.md?match_all_tags=true&page=1&tags%5B%5D=Lumen)