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This random map generator for Left 4 Dead 2 mends predefined tiles together to make new levels. The project is based on python and includes a crude VMF (Valve Map File) source reader. Seams are detected by special materials. See the readme in the archive for further technical documentation. A script for creating the navigation mesh for the bots and zombies is included. Although created for Left 4 Dead 2, the random map generator can work with any source based game.