OptiTrack at GDC last week showed off a demonstration of their enterprise/commercial tracking technology which is capable of accurately tracking hundreds of objects simultaneously in real-time. For those building out of home applications with VR, OptiTrack now has available a set of add-ons and a suite of tools for tracking of Rift and Vive headsets, bodies, and props, including a SteamVR plugin.
At the company's GDC booth last week, OptiTrack had one of their modular tracking volumes set up with 25 cameras tracking 140 real-world objects simultaneously. Most of the objects were custom-made giant Jenga blocks which were (each individually tracked), along with VR headsets, gloves, and more.
Wearing a wireless HTC Vive Pro (with an OptiTrack tracking add-on), I was able to play a complete game of Jenga purely by relying on the mediated information coming through the headset.
The demo showed the capability of the OptiTrack system to accurately track objects with only a single active marker visible—thanks to an array of cameras which can accurately triangulate, plus an on-board IMU for rotation and acceleration—leading to robustness against occlusion by brute-forcing the problem with highly redundant camera coverage.
The result was that at the booth, even with lots of attendees mulling about and playing interactively with the Jenga blocks (which were largely occluded except on the sides, thanks to being stacked in towers), while maintaining high-performance tracking.
To demonstrate the tracking performance, the OptiTrack team also set up the blocks as dominoes to knock them down. While it looks outwardly like a physical simulation rendered in the computer, there's actually no physics calculations happening at all, just raw motion tracking information of how the blocks are individually moving in the real world.