UE5 Lumen - Light huge problem, shadow move, grain, light vanish...

Hello
I’m having a huge problem with my lighting no matter what i dot it’ looks horrible…

Here is a video where you can see all at once ALL the problems i have…

Can you help me ? thanks

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It might be a bit of a bug in Lumen, or you might be able to tune it out with post process parameters.

I noticed this vid about reflections

It might not solve your problem, but the Lumen params you can influence are listed here

image

Just put Lumen in the search bar

then use your browser search to find ‘shadow’.

Some that look possible

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Did you try and separate each wall, floor and ceiling meshes so they can be handled individually by lumen?

Thanks both of you but it doesn’t solve anything…

This is weird because some of my mesh who have a material who reflect light can affter my entire level with this problem

Post the lumen debug views