Unreal Engine 5 How To Fix Foliage Flickering / Noise

Just paste this in the console
r.Lumen.ScreenProbeGather.ScreenTraces.HZBTraversal 0

and if that doesnt help try messing with:
r.Lumen.ScreenProbeGather.Temporal.DistanceThreshold

[rabellogp]

Great tip!!
Additional note: Unreal already disables HZB traversal for TwoSidedFoliage shader mode by default So forcing it off is just needed if you are using different types of shaders for foliage or dense clusters of thin meshes for any other purpose.

[Fortunate_Son]

OMG bro, accidentally saw your video. Pure fire! I am newbie to UE and while suffering because of this issue I thought it is me who does something wrong. But this time time not:)

[ShiftsCinema]

Instant fix for something that has been a problem for me forever! Thanks very much!

[privaatsak]

Your tone in this video is so annoyed - love it cos I know exactly how you feel 😂 Why isn't this set by default?!

[wingsofiron]

Dude holy moly, you're a life saver, I couldn't figure out for the life of me what was causing it. Night and day difference in my scene, thank you!

[LucasLAB-Studio]

These Lumen settings can be accessed from the Post Process Volume under Global Illumination, Screen Space is currently in Beta (UE 5.3)

[mendokasan]

Why does this guy have only 99 subscribers? He should have at least 100K subscribers. He's a lifesaver!

[phatnguyenchau]

Life saver! I have been struggling with this flickering shadow for a while. Thank you so much!

[tommyg]

it does a good job at reducing flickering, but if you look carefully as the grass rolls off over a hill for example, you'll notice there is a lot less definition in the smooth rolloff of a shadow hitting the grass. When the sun is low in the sky for example.

[Toetech]

Actually I don't think that it's a lumen issue. I think this weird shadow issue has been in UE for ages. Atleast I remember running into this back in ue 4. I think it had something to do with the distance field shadows. (unless this and that distance field problem just occur very similarly) But amazing that you found a fix for this. def liking and saving this, good job! 👍

I think the issue is actually Distance Field AO not correctly interacting with Small Cards Meshes Aka almost all foliage meshes, or any mesh that is too thing or to noisy in shape, you can fix it completly by either deactivating Distance Field AO in the mesh LODs Material Section in the Mesh Inspector Window or By Increasing the Distance FIeld Mesh Resolution Scale for the Mesh, also in the same Window, this however is quite expensive for massive foliage instance use and also generates an overall Darkning and SelfShadow issues in some cases, thats why i dont use it on my foliage, unless i am using nanite driven fully modeled foliage (something that still not suitable for actual game projects) and stean increase the ScreenSpace AO power to simulate AO on Foliage, or you can also implement Nvidias HBAO for UE5 in your project. And i agree this should be a major issue to be solve by epic.

[Mister_mac]

OMG, thank you so much, you have no idea how desperate i was to find a solution for this. Thank you

[PradyumnaRao]

Wow this fixed my issue, thank you so much!

[VaunaKiller]

Thanks for sharing a tip! Next time record in at least 1080p pls, the YT is ruthlessly compressing 720 to the point one cannot see anything but blur

[stanavov]

I tried to apply this but then the contrast of the picture at a large distance is greatly reduced :( in any case, thank you very much!

[SuadKapetanovic]

Hi! Great tip! Do you know how to also disable this permanently, so its not included in the packaged project?

[snrvlr]

hey there. first of all great video BUT
what's the name of your game? looks amazing....

[Kaiser]

I never really noticed it until I seen it really bad in Sons of The Forest with the trees etc. Then I looked at my other games and it's in every game I play and got major OCD seeing it now and I can't even play the games now that I see it, bothers me that bad. It's really bad it GTA 4 and Forza Horizon 5. To the point it's painful to look at. People are saying it's from dirty electricity and can't be fixed. Mine is more like shimmering/flashing foliage and flickering.

[kintenkinten]

It’s not default because it’s not desired in all use cases, unless you are using twosided foliage, are you?
Also, not entirely sure what you mean ”not an option”? Do you mean as a per shader flag?

[aphexx]

good stuff! thank you for sharing, how did you find it?