NaturalPoint is presenting TrackIR for 3D head tracking in PC games. TrackIR is designed to turn any monitor into a 3D desktop VR experience, and has special support in more than 80 PC games. The company also is demonstrating Arena, its new full-body motion-capture system, in Booth 6433. Arena includes support for multiple actors and up to 24 OptiTrack cameras running on one laptop.