Collision hull
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In computer gaming, a collision hull is an abstracted representation of the 3D world which the player can see. It is generally coterminous to the visible representation, but is usually much more simplified and is considered internally distinct by the game engine. What may look like a stairway in the visible game world will be a flat polygon in the collision hull. Almost all game logic, like deciding where the player can and cannot walk, and if the player can do special actions (e.g. like grabbing a ledge), is done with respect to the collision hull.
