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Though I don't know the project, I would believe it's a cheaper form of preventing the tilemap from overrunning its boundaries, since the player would not be allowed to see the outer edges in this fashion. If the tilemap were to be centered on the character, you'd have to make a larger tilemap in the event the character wants to go toward the edge of the map, where the tilemapper would have to then start displaying things outside of its original boundary.