Green Glowing Lines in Viewport - Error

Development Rendering
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1

Hello
I’m working on a ice cave cinematic rendering, and I’ve started getting these flowing green lines in my mesh bounderies/overlaps. They persist and also show up in renderings.
I’ve tried looking online to see why this might happen but I can’t find any reference to anything like it.
I’m fairly new to UE, and only use it for long cinematic renderings.

I’ve attached a screengrab to show what it looks like.
I’m using UE 5.4 with substrate materials and rendering with lumen.
Hopefully someone can’t point me in the right direction so I can get it fixed.

UE5_greenLinesViewport
UE5_greenLinesViewport1846×763 140 KB

2

Is this new? This looks like a drivers issue. Can you try rolling back your drivers?

3

Yeah it is somewhat new, think it started a month ago, maybe 6 weeks.

I’ve tried rolling back to the Nvidia Studio Driver before the newest one but it still persists. I’ve got 0 clue how to fix this.

4

Perhaps you need to delete the derived data cache folder to get the shaders to rebuild to the changed drivers?

5

Hi, thanks for the suggestion. I tried it, but no luck. Still looks the same unfortunately.

6

Could it perhaps have something to do with my lights? I’m using point lights, all set to movable to try and get around the amount-of-overlapping-lights allowed with stationary lights.
Is this silly to do? And more importantly, might it have something to do with the green glowy lines?

7

Can you try and roll back to 552.22?

8

Thanks for the suggestion. I did as suggested but no change sadly. Starting to despair of this a bit.