A module to interface Garry's Mod with the leap motion device ( https://www.leapmotion.com/ )
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Download the module from the releases section
Drop gmcl_leap_win32.dll in your garrysmod/garrysmod/lua/bin/
Drop Leap.dll in the garrysmod folder where hl2.exe is.
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Setup an environment variable LEAP_SDK pointing to the last version of the skeletal tracking API ( https://developer.leapmotion.com/ )