AIN

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An AIN file is a nodegraph; it can either be automatically generated or made from info_nodes placed by hand in the level. AIN file s are used by NPC's to navigate around their enviroment. The AIN file ( <MAP_NAME>.ain ) is generated by the game, if there is no existing AIN file specific to that map, or it was generated for an older version of that map. The message "Node graph out of date. Rebuilding..." is seen at the begining of that map, if the AIN file was built or re-built.