Hi people,
hope you are doing well and are safe!
Been playing around in UE editor, learning about landscape generation and materials etc…
when all of a sudden these parallel lines started to appear.
I am also playing with the time of the day.
They are most pronounced when the Sun is rising up or setting down.
Has someone encountered a similar situation?
How do I avoid this?
Best,
me
It looks like shadow banding, which might be corrected via Cascading Shadow Maps settings. I’m not sure how it occurs, and I don’t always encounter it. The Shadow Bias setting is often referenced as a corrective, but that can make it worse or if it fixes it, introduces another issue or two with light leaking over edges and/or the mesh appearing to float as the shadow disconnects somewhat from the occluded corners. There’s a console variable (press ~ to bring up console) for cascading shadow maps resolution, it’s probably “r.shadow.MaxCSMresolution” or “r.shadows.CSMresolutionMax” or something similar, possibly without “shadow” written first. Increase it, but be careful not to go too high because it exponentially increases memory usage. There’s other cvars that may or may not help / fix it too. By simply typing “r.” or “r.shadows” a list of those display in the console, or in Output Log (access by going up to Window > Developer Tools).
Hey, presto, I did try to play around with the values/settings for it, it would affect the lines but never remove them.
After many tries to create a new file (even engine reinstall) It just disappear on its own. Maybe it was due to a driver issue. Who knows :).
Tnx for your reply!
me
No problem. I’ve encountered it in multiple scenes, and the first time it resolved on its own somehow. CSM settings can potentially solve it, but it’s not easy and may cause other problems in the scene’s shadows. Same for Shadow Bias. I don’t understand what it’s from either, as it doesn’t happen in every scene, though I think it occurs only in dynamic lighting.
