# Foliage Grass flickering in the shadow UE5 Lumen **URL:** \ **Category:** Rendering\ **Tags:** unreal-engine, UE5-0, Lumen, Rendering, question\ **Created:** [May 20, 2022, 4:19pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118 "2022-05-20T16:19:06Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![jjhuang](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jjhuang](https://forums.unrealengine.com/u/jjhuang)\ **Post date:** [May 20, 2022, 4:19pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/1 "2022-05-20T16:19:06Z")
[![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/b/7/eb7d8b51ffd1644c121abce57858dcfe6517accf.jpeg "UE5 lumen Foliage flickering") ](https://www.youtube.com/watch?v=pi-mPhBSQ0E) How to solve this problem ? Lowpoly grass ? mesh Not visible form Lumen GI ? or Any settings I would like to try ---
**Author:** ![DaEmpty](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DaEmpty](https://forums.unrealengine.com/u/DaEmpty)\ **Post date:** [May 23, 2022, 4:47pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/2 "2022-05-23T16:47:29Z")
I haven’t found a good solution yet. r.Lumen.ScreenProbeGather.\* is the namespace you are looking for. Reducing r.Lumen.ScreenProbeGather.DownsampleFactor does help a lot, but it is also expensive. You can disable r.Lumen.ScreenProbeGather.ScreenTraces.HZBTraversal, but it has massive impact on the image quality. ---
**Author:** ![jjhuang](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jjhuang](https://forums.unrealengine.com/u/jjhuang)\ **Post date:** [May 24, 2022, 5:41am UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/3 "2022-05-24T05:41:45Z")
Thanks, That help a lot , I will keep trying. ---
**Author:** ![Macler](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/macler/32/467494_2.png) [@Macler](https://forums.unrealengine.com/u/Macler)\ **Post date:** [May 24, 2022, 9:38am UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/4 "2022-05-24T09:38:21Z")
Im having the same problem. It feels like it is something with the sky light and the amount of light hitting the grass. Did you make any progress so far? ML ---
**Author:** ![jjhuang](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jjhuang](https://forums.unrealengine.com/u/jjhuang)\ **Post date:** [May 31, 2022, 5:28pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/5 "2022-05-31T17:28:08Z")
I also post a video on Youtube, someone post a resolution there . [UE5 Lumen Foliage flickering.. - YouTube](https://www.youtube.com/watch?v=OqDuO8uLx2A) Hope that could help !! ---
**Author:** ![DaEmpty](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DaEmpty](https://forums.unrealengine.com/u/DaEmpty)\ **Post date:** [May 31, 2022, 6:34pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/6 "2022-05-31T18:34:23Z")
That’s more a workaround than a solution. The grass looks way worse after disabling it. ---
**Author:** ![Matthu23](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Matthu23](https://forums.unrealengine.com/u/Matthu23)\ **Post date:** [October 15, 2022, 2:58am UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/7 "2022-10-15T02:58:05Z")
Has anyone found a solution for this? ---
**Author:** ![Azeew27](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Azeew27](https://forums.unrealengine.com/u/Azeew27)\ **Post date:** [October 16, 2022, 12:46pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/8 "2022-10-16T12:46:46Z")
I’m also desperately looking for a solution. Any updates? ---
**Author:** ![Johndaniell](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Johndaniell](https://forums.unrealengine.com/u/Johndaniell)\ **Post date:** [May 24, 2023, 4:26pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/9 "2023-05-24T16:26:16Z")
r.Lumen.ScreenProbeGather.Temporal.DistanceThreshold 0.2 ---
**Author:** ![beoquebec](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@beoquebec](https://forums.unrealengine.com/u/beoquebec)\ **Post date:** [November 22, 2023, 5:50pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/10 "2023-11-22T17:50:02Z")
for light flickering , you can go : Project settings, Rendering, Default Settings, Anti-Aliassing Method, and choose Temporal super-resolution (TSR) , it work for me ---
**Author:** ![Gypsy\_Jazz](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Gypsy\_Jazz](https://forums.unrealengine.com/u/Gypsy_Jazz)\ **Post date:** [December 3, 2023, 1:59pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/11 "2023-12-03T13:59:15Z")
I found the solution, I was going crazy, ‘skylight’ - \> details tab - \> min occlusion: set it to max ---
**Author:** ![AspEed6969](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@AspEed6969](https://forums.unrealengine.com/u/AspEed6969)\ **Post date:** [December 19, 2023, 7:59pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/12 "2023-12-19T19:59:32Z")
Brother You helped me sooo much, Thank You Guys if you use UltraDynamicSky as me, you can do the same thing it should help you, the name in UDS is DFAO Min Occlusion ---
**Author:** ![phil123456](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@phil123456](https://forums.unrealengine.com/u/phil123456)\ **Post date:** [January 5, 2024, 12:31pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/13 "2024-01-05T12:31:03Z")
> [@Johndaniell](#): > > r.Lumen.ScreenProbeGather.Temporal.DistanceThreshold 0.2 does not work for me ---
**Author:** ![Anonymous\_2210d72d3515234552b42f64ab1279fd](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_2210d72d3515234552b42f64ab1279fd](https://forums.unrealengine.com/u/Anonymous_2210d72d3515234552b42f64ab1279fd)\ **Post date:** [April 21, 2026, 2:28pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/14 "2026-04-21T14:28:22Z")
Disable Visible in Ray Tracing in FoliageInstanceStaticComponent. ---
**Author:** ![godsic](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@godsic](https://forums.unrealengine.com/u/godsic)\ **Post date:** [May 27, 2026, 7:27pm UTC](https://forums.unrealengine.com/t/foliage-grass-flickering-in-the-shadow-ue5-lumen/562118/15 "2026-05-27T19:27:58Z")
THIS is what fixed it for me! Thanks dude! You rock!