With many different Lightmass quality settings (even extremely high settings, up to 40-50 minute builds), and different types of light (spot / point / point with IES / static / stationary) I get this error on about 60-70% of my builds (sometimes it doesn’t happen, but it is almost definitely a random occurrence):
Light comes through the adjacent room, somehow doesn’t cast light on the bed, and yet the bed acts as if it’s being lit and emits bouncelight, despite not having direct light on it. As you can see on the third image and the floorplan below, it’s as if the bed is bouncing un-occluded light from the room next door at full power, as if the wall separating them is not there, and yet it’s not receiving any light on itself. This happens to a lot of my objects that happened to be placed near a wall but slightly away from the wall, it’s not limited to these beds but it does happen the worst on them.
This is the floor plan:
Have been using UE4 for around two years and all of my projects use Lightmass, and this is the first I’m seeing this (update - not the first time actually, I forgot about another project which had this issue some months back, screenshot on post below). Does anyone have any idea of how to fix this? Any Epic staff who work on Lightmass could chime in with their thoughts? It’s driving me crazy, especially because it will sometimes not happen, despite me not changing any setting, so it becomes almost impossible to resolve myself through trial and error.