[UE5] Lumen Noise Effect

[linkthehero23]

@Savonir Those settings you recommend were already set for me by default in UE 5.3 and I’m still having significant noise in the reflections on materials with roughness. I’ve found these settings to be a good compromise.

With these settings below, my scene looks more realistic than “screenspace” reflections, but not quite as good as path tracing, but it’s somewhere in the middle, still using lumen but somewhat throttled back. Give these a try:

Settings to reduce Noise with in Lumen Reflections:
r.Lumen.Reflections.MaxRayIntensity=3
r.Lumen.Reflections.BilateralFilter.SpatialKernelRadius=0.01

The defaults for these values are:
r.Lumen.Reflections.MaxRayIntensity=100
r.Lumen.Reflections.BilateralFilter.SpatialKernelRadius=0.001

Here’s a link where I post some screenshot examples of the various options and settings.

Lumen having a lot of noise in reflections in dark areas

I am experiencing Lumen Reflection Noise with Unreal Engine 5.3. @jblackwell Your explanation of the problem got me thinking and try a few different things. I found these settings that seem to be giving me much better results with Lumen Reflections with materials that have roughness, and significantly less noise. With these settings it looks much more realistic than the “screenspace” reflections, and not as good as pathtracing (obviously), but it’s something in the middle utilizing lumen refl…