[UE5.3] Weird big pixles shadow on wall and floor

Development Rendering
,
1

Hi all,

I’m having this super weird shadow like effect that I can not seem to fix. It shows in random spots.
I remember someone told me to use the commands r.Lumen.Reflection.SOMETHING to fix it but I might be mistaken on dreaming.
Info:
I’m using UE5.3
The whole scene is a Datasmith assets.

Please watch the video to see the shadow like effect and help me fix it.

Thank you very much.

2

Hello there @AKA_The_Boss!

That is a strange occurrence, with no clear origin. Checking around the community, there are multiple ways to deal with flickering effects, let’s try to implement some of them:

  • Please ensure your OS and video drivers are in the latest version available. I would suggest a clean install of nVidia drivers, and to use the Developer drivers

  • Next, if Nanite is enabled in your affected meshes, test by disabling it

  • If the affected assets are always the same, if would be worth opening them in a 3D tool (like Blender), and perform checks for normals orientation, and non-manifold geometry

  • As per the command you are referring, it could be one of the following below:

r.Lumen.Reflections.HierarchicalScreenTraces 0
r.Lumen.Reflections.HighQuality 0
r.Lumen.ScreenProbeGather.ScreenTraces 0
r.Lumen.Reflections.ScreenTraces 0

  • You can also test disabling hardware ray tracing:

image
image690×385 31.6 KB

3

It might be an issue with the virtual shadow resolution. You can give it a try:

r.Shadow.Virtual.OnePassProjection.MaxLightsPerPixel 64

1 Like
4

Thank you for replying. I have tried all of these, but nothing works.
I came to the conclusion that it is related to shadow maps.

YoungTree solution has fixed it

5

Thank you very much. This solution has fixed it.
Thank you thank you thank you!