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The Material Editor is an engine tool available in Source 2007 and later. To use it, run your game or mod with -tools -nop4 on the command line and select 'Material Editor' from the Tools menu. This tool is used to edit the material properties with the added advantage of a preview.
Warning: you need to use the command: "toolload vmt" in console for Alien Swarm to load
To do: Describe the Interface, Make a user tutorial