UE 5.7.4 - Lumen - As a new object appears on screen from behind another, black lines appear

Development Rendering
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1

Default lumen settings, the issue is most visible in a brightly light space.
When you move around, in the viewport or in-game, there are black lines that appear when distance objects appear on screen from behind another.

Its mostly when a new object appears on screen, maybe when lumen calculates? To show that it is mostly when a new object appears on screen, I added different materials to some wall meshes behind the pillar in this test scene.

The youtube video I linked shows this, but here are some gifs and screenshots from the same video: https://youtu.be/torPbGRePUM

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image814×479 55.1 KB

LumenBlackLine

2

what’s the color of your skybox? this looks like an occlusion culling artefact with a black skybox.

3

Might need to make the bounds of your wall pieces 1.25x larger just to make sure they don’t get culled.

4

This is exactly what it is. I Had a black skybox

5

I have increased the positive & negative bounds extension values quite a bit and the artifact is still there