Black area in shiny, reflective, substrate mirrored surface

In the pic, a simple mirrored/chrome surface, on a sphere. It’s got over black areas and the reflected shadows are also over black. Any ideas how to fix? it seems to be where it’s reflecting things below the horizon. The black area gets larger when the camera moves closer.
UE 5.5 wih lumen. One of my characters has a wobbly shiny head with this material.

thanks

If I’m not mistaken I believe this is caused by screen traces in lumen GI and reflections. Try turning those off on your post process volume.

Thanks. I will try that!

I think it’s the opposite. The part that isn’t black is the screen trace. The black is the landscape where a screen trace missed and it had to switch to world space raytracing. My guess is your landscape is not being included in raytracing.

I think there’s a cvar to toggle landscapes in RT, and you may also be able to click on the landscape and check a box to enable on raytracing. When enabling RT for landscapes, it’s important to have good level of detail settings.