[UE5] Lumen Noise Effect

[SkyboundBillM]

@Savonir

r.Lumen.ScreenProbeGather.DownsampleFactor=8

Keep in mind that r.Lumen.ScreenProbeGather.DownsampleFactor has a HUGE effect on GPU performance. 16 vs 8 is a difference of almost 4ms on a 4090. That likely makes it a dealbreaker for most actual games. It does help with the noise, though.

[Chance325]

To improve the shadow quality using Lumen, one can add a PostProcessingVolume, find the “Final Gather Quality” setting, tune it up as needed. The UI slider only allows you to tune it up to 2.0, but you can type any arbitrary number. For my case 5 is good enough, 10 is essentially perfect.