As you can see on the video above, whenever I move around the camera in editor, or “in-game” when I hit the “play” button, I get some weird flickering and moving dark spots.
I tried to tweak my light sources, but nothing helped. Then I selected the wall, to see if I could maybe play around with it’s lighting parameters… and before I did anything, the problem disappeared. Just from selecting the wall.
Edit: It’s still happening “in-game” though.
I thought it might be somehow connected to the issue I encountered a little while ago in the same spot: Weirdest lighting bug out of nowhere - Rendering - Epic Developer Community Forums
I thought I solved it, but after looking around more thoroughly, I found that at some viewing angles the same thing still appears briefly, flickering in and out of existence. This is very annoying and ruins my scene - I wanted to make a camera doing a fly-by, demonstrating everything, but whenever I move through the scene, the flickering that I mentioned starts happening.
It only goes away if I disable all the lighting channels on light sources, beside the Channel 0. But I need to have Channel 0 and Channel 1 enabled, because otherwise the torch shaft wouldn’t be lit correctly (the shaft is using Channel 1 so that it won’t cast a huge and ugly blob shadow on the ground from the light source directly above it).
I don’t know what else to do. I even tried to update the engine to the latest version and launching the copy of my scene there, but the flickering still happens.
My conclusion: something about lighting channels is bugged. Because if I disable everything except Channel 0, all the bugs are gone.