You could create one sublevel with all geometry.
Then if you want to have one Night scene and a Day scene:
you can either create a level with the night light and add geometry as sublevel or create a general level, add night light as sublevel and geometry as sublevel
Here a Level with 3 sublevel:
- General is an empty level with the 3 sublevels.
- Archi contains all the geometry and no lights. It could contain parking lights that are always on (day and night).
- Day contains no geometry and all the day light actors: directional light, sky atmosphere , sky light, etc
- Night contains no geometry and all the street spot lights, etc.
Then you can just turn on day or light sublevels to change lighting on the scene.
