Cell

A Cell is a data structure and the representation of somewhere in a Worldspace, it can be either a piece of the world, such as a piece of terrain, or an interior, such as a house or a city.

A Cell is always contained inside a Worldspace, and the worldspace is made up of cells.

You can view a Cell as a piece of world, as the player moves around, cells are loaded and unloaded from the game, allowing you to have a huge and continuous world.

Every cell is either an Interior Cell or an Exterior Cell:

Interior Cell

An Interior Cell is a cell that represents something that is an Interior, such as a City in the world, or an house. It is something that doesn't have to be split, and is loadable as a whole, without having to worry about performances, NPCs count or anything else. An Interior cell is often accessible from an Exterior Cell, but you can have nested Interiors too.

An Interior Cell is always contained into a Worldpsace flagged as type: Interior.

An Interior cell loaded in the Scene view.

Exterior Cell

An Exterior cell