Github Polytrack | ((free))

PolyTrack is a lightweight, high-performance tracker that links polygon masks across video frames. Unlike bounding-box trackers (e.g., Deep SORT), PolyTrack preserves spatial geometry, making it ideal for autonomous driving, robotics, and video editing.

However, based on how GitHub features are typically named, here are the most likely possibilities for what you might be referring to: github polytrack

If you are a developer, researcher, or prosumer VRChat user who isn't afraid of a command line and a calibration routine, It democratizes technology that was locked behind corporate paywalls a decade ago. The killer app

The killer app. Commercial FBT requires $300+ Vive Trackers and base stations. Polytrack users are building 4-camera arrays for under $150. By attaching small reflective spheres or IR LEDs to shoes, hips, and elbows, users report reliable 6-point tracking (Spine, Feet, Hands) in VRChat using the module included in the repo. By attaching small reflective spheres or IR LEDs

Run the calibration wizard: