Very basic Oculus Rift support for Garry's Mod. In case lauching it with -vr just freezes or crashes your GMod application.
Tested on OS X 10.9, Oculus SDK 0.5.0.1-beta, a Rift DK1 and Garry's Mod 13.
You need the Oculus SDK 0.4 or later installed to /opt/LibOVR, than use CMake to configure and compile the program. Upon make install all dependencies will be put in your local Steam installation.
Connect the Oculus Rift and start a new game. In your Spawn Menu choose Post Process and under Effects activate Oculus Rift Support. You can recenter the sensor on the current player's view by clicking Reset Orientation.
This tool is part of the CHI15 publication Level-Ups: Motorized Stilts that Simulate Stair Steps in Virtual Reality.