What I mean is exactly that - no smooth transition between scenarios. Imagine you walk around and it’s “morning”. Then after some time you go inside of a building, screen fades (or not) and lighting scenario switched to “day”, then screen fades out of black and when you go outside, it’s a day light. Rinse/repeat for however many lighting scenarios the level has. Since it’s not a smooth transition, player won’t “see” the hitch. And if scenarios can be async streamed, there should be minimal hitch when loading.