Weird flickering on surfaces?

Development Rendering
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1

Hi everyone!

I recently started to work on some lighting for my proto level, and wanted to not use Lumen - however, I am getting this horrible graphical issue with weird splotches and moving black ant like shadows - I disabled lumen, screen space and deleted all PP volumes, but the issue persists.

I never experienced this before - Lumen does fix it, and it gets rid of the ant shadows, but I really want to understand what this is and what is causing the issue.

Here is an example video:

I tested my project on my normal machine (RTX 3070, 32GB Ram, 8 GB Gpu) and another pc (Geforce 1660 Ti 16 GB Ram, 6 GB GPU)
but both have the rendering issue. Building also does not fix it - so far, the only thing I noticed that reduced the shadow ants is putting the screen percentage to 200%, but setting Vysnc or AA to higher values does not help.

The shadow ants appear on the Unreal Engine Cubes that I used for blockouts and my own meshes, with or without textures.

Could someone help me out here?

2

No idea what is happening here? :confused:

3

partially looks like an ao issues, but also more like a distance field shadow thing. check the console for parameters and see if you can tweak something that fixes it.

iā€™m guessing tho. no clue what it really is. never seen that glitch.

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4

Thank you! I am pretty new to this, do you happen to know what kind of console commands I could try?

5

Just leaving this here: the issue was caused by the skylight in dynamic mode. Seems to be an issue with the dynamic distance field, but I was not able to fix it so far.

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6

Is this UE4?

7

Nope, it is UE 5.3.2 (and 5.5.3 as well)

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