Controls the range within which the entities' light depends on the brightness and shadows of the floor area below (default 1000 quants). If the entities' height above the floor exceeds that range, the entity won't receive light, albedo and fog values from the floor texture. This way it can be prevented that aircraft models in a flight simulator suddenly change their brightness dependent on shadows on the ground.
0 .. unlimited (default: 1000)
floor_range = 100;