ScreenPercent at 25%, strange lighting artifacts

Development Rendering
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1

Hello!

I’m getting some strange lighting artifacts when I set my ScreenPercent to 25%. At best it looks like a strange dithering pattern and at worst and entire part of the screen is blacked out:

artifacts
artifacts1063×712 82.5 KB

artifacts2
artifacts21104×720 76.7 KB

  1. The scene uses the default SM_Cube static meshes meant for blueprinting.
  2. The scene uses static point lights.
  3. I have anti-aliasing turned off in my project settings. I also tried it with FXAA, but the problem persisted. I’ve also turned of some other rendering features, such as bloom and ambient occlusion.
  4. I changed some values in my DefaultEngine.ini file:
    r.TemporalAA.Upsampling=False
    r.AntiAliasingMethod=0
    r.MSAACount=0
    r.ScreenPercentage=25
    r.Upscale.Quality=0

Besides the points listed above I’m not sure what other relevant information I can give to help debug this issue, so please let me know if there is anything specific you’d like to know about the way my project and scene is set up.

Thanks!

2

So after a bit of messing around in the project rendering setting and removing r.MSAACount=0 from my project, the artifacts disappeared!
I’m not sure what fixed it exactly, but I just went down the list and turned off anything that was excessive for a retro style game anyways.

One thing I clearly remember turning off was Lumen, but that didn’t fix it on its own. I’ll try and find out what it was specifically later and post my findings for anybody who might run into the same issue in the future.