@fco3d @Navhkrin I observed the same issue in an imported game (just for testing purposes.)
There are certain areas where lumen just “breaks”, move a bit and it works again - not 100% reproducable. (might work in editor at the same location, or not)
I tried to figure out what is causing this, but without any results, given that the same assets appear everywhere else in the game. Sometimes the same area breaks/works within minutes of me running around in the game.
I can see the same “artifacts” on the stairs and flor that I can see in both images.
Video (the game is not built for GI (and unfinished), but I adjusted most of the emissives etc, not all.):
EDIT: Further information
- The game is only lit by the sun and the emissive/lights in the game world, no skylight, nothing else.
If someone from epic needs more information, feel free to contact me, I will gladly help to get Lumen working properly. (maybe this is something specific with “how I do stuff” or so, idk.)
I could also share the Game with you, if necessary, since this isnt something easily replicable (at least from my observations.)