Hey everyone , i’ve been experiencing a strange bug for days , on this mesh of 9m polygons (coming from photogrammetry so , can’t reduce it).
I’m using Nanite but now i can’t change Lumen Parameters , i don’t know why.
Here is a record of this bug
I don’t know what is causing this so , any help would be cool !
I don’t know what is going on, but lets try to narrow it down.
Can you try just hiding everything but that mesh and the light? does it still do it?
Hey ,
I’ve tried debugging using your method , hiding everything but the mesh and add more and more of my actors in the scene, but , even alone , my mesh was still flickering. So no worries , i gave up before hammering my keyboard and loaded an old secured version which was fine.
They key would be isolating the issue and identifying a potential bug to report it, as it may happen for you again, in any random situation and any random mesh 
I finally succeded to fix my issue (thanks to my UE5 teacher) , if someone had the same , just enter this command in the UE console :
r.RayTracing.NormalBias 5
This issue was apparently a bug with Ray Tracing so, hope it can help someone 
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