In this document, we will explore MLO interior definition files in GTA IV game for PC. Each of the interiors used in game has it's definition in IDE file. Each MLO section contains all information required by game for rendering interiors, such as object coordinates in interiors, and also rooms and portals. All coordinates in MLO section are in local interior 3D space (relative to center of interior), because game uses same interior definitions at different locations on the map.

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