Hi,
I have to battle some AO/Reflections/Shadows flickering and some minor mesh artifacts inside of Unreal Engine 5.5.4 (Lumen Lighting).
Test Video:
https://www.youtube.com/watch?v=2qNdnskaGso
For the flickering, I've tried these but wasn't able to solve it. Maybe someone has another idea for getting rid of the flickering working with Lumen.
Adjust Post Process and Project Settings console commands:
Set reflection downsample factor (r.Lumen.Reflections.DownsampleFactor) to 0 or 1 to maximize resolution.
Increase max reflection bounces to allow more accurate reflections in glass/windows.
Enable screen traces for reflections (r.Lumen.Reflections.ScreenTraces 1).
Avoid overlapping glass surfaces or double-thin geometry which can cause flickering due to conflicting reflection rays.
Slightly move light sources away from reflecting surfaces to prevent glitching caused by lights too close to windows.
Use single-sided glass materials where feasible, though this is not always suitable for buildings.
Optionally disable certain Lumen screen tracing features to see if specific flicker sources can be mitigated (test r.Lumen.ScreenProbeGather.ScreenTraces 0 as an example).
Increasing screen percentage in post process volume improves reflection sharpness but impacts performance. Find a balance there.
Thank you for any help!
Marc