UE5 Lumen lines/streaks artifact

Development Rendering
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1

I’m getting some weird artifacting on some of my models. It appears as these vertical streaks that run in sync with the 4 cardinal directions. They only ever appear if my model is in shadow. I tried so many model import settings at this point.

If I rotate the model, the streaks do not change position:

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NQxPxAPDWu1378×620 53.6 KB

The moment I disable Lumen, the problem goes away:

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brmlBtdNSX825×645 32 KB

This problem popped up as soon as UE5 went out of EA.

2

They honestly just look like reflections to me. What happens if you set the material to max roughness?

3

Probably the same as this issue. I don’t think there’s a solution as of right now.

4

Yes, looks to be the same problem. It’s only really a problem with round objects.

5

For what it is worth, Daniel Wright responded with a workaround in that thread last night:

Worth seeing if that fixes it for you