Take a look at the various tools Unreal Engine 5 provides to help build massive open worlds.
https://dev.epicgames.com/community/learning/talks-and-demos/LLM5/building-open-worlds-in-unreal-engine-5-unreal-fest-2022
Can we use different layers containing static lighting elements and build them separately alsongside other layers?
For example:
A: Data layer with my world elements.
B: Data layer with static day lighting.
C: Data layer with static night lighting.
I would build lightmass with A+B and A+C separately. Then on packaged build, I could switch from B to C and get shadows updated.
Just like Lighting scenarios of the previous system. Or it works with dynamic lighting only?