Fix some artefact in Lumen reflection

Development Rendering
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1

i have found some CVAR commands to improve artifact in LUMEN Reflection

reflection
reflection1414×1020 75.3 KB

Remove some flickering :


with this command, you lose some contrast but the result for me is usable
r.Lumen.Reflections.RoughnessFadeLength 1 (default 0.4)

Remove some reflection banding:


(thanks to : Unreal Explorer
with this command, you can remove some strange banding :
r.Lumen.Reflections.HierarchicalScreenTraces.MaxIterations 4 (default 50)

hope it helps someone :slight_smile:
Have a nice day
Daniel

3 Likes
2

Hi @dpotuznik ,

Thank you for sharing!

But with the first cvar, I think you will eliminate any chance of having rough variations in a surface. It will erase/clamp the roughness values and reduce the reflectiveness of surfaces. It worths to maintain it as low as possible, in general. I have seen that it may create even more noise, in fact.

The second cvar could decrease reflection details regarding GI indirect illumination. But if it solves your banding problem (never seen before), that’s great!

As always, every project has its own needs, sure.