Hey guys!
We highly appreciate the 5.5.1 update! Unfortunately there’s an issue since 5.5 that I haven’t seen any reports on anywhere, which is that HW lumen ignores the Landscape visibility mask. I’ve submitted a bug report upon release, but never actually managed to find it again afterwards.
As seen here, HW lumen with Surface Cache does not factor in any holes in the landscape’s visibility mask.
With SW lumen, this is working fine.
We use visibility masking to hide the landscape over a bunch of nanite meshes and now get diffuse shadows all over the place, as the masked landscape is still “visible” to lumen.
This becomes an even bigger issue with caves, as the landscape would block any diffuse light from falling in. Using Hit Lighting fixes the issue, but the performance cost is too heavy for actual consideration.