OptionalcameraLOD camera; defaults to the R3F camera.
OptionalcitySettings shared by every settlement (centre, size, radius and seed come from the population; sizes maps it onto cities).
OptionalframeLayout frame (world.frame by default).
OptionalmaxMost settlements to build, largest first.
OptionalpopulationWhere people live: the population model's settings (its center and radius are the area to populate).
OptionalrefReceives the underlying Settlements group.
The world to populate.
Props of
<Settlements>: every SettlementsOptions setting plus the objects below.