SteamVR Tracking

See also: Lighthouse, Positional tracking and Outside-in tracking

SteamVR Tracking is the positional tracking system developed by Valve for its SteamVR platform. It uses outside-in 6DOF tracking: fixed reference units called base stations sweep the room with infrared laser planes, and photosensors on the tracked devices read that light to compute their own position and orientation in real time.

The underlying technology was developed at Valve under the project name Lighthouse, and the two names are used for the same system; "SteamVR Tracking" is the name Valve uses for the productized and licensed version, including its numbered hardware generations 1.0 and 2.0. Valve offers SteamVR Tracking to third-party hardware makers through a royalty-free licensing program, which has led to its use in headsets and accessories from companies other than Valve, including the HTC Vive, the Valve Index, the Bigscreen Beyond, the Pimax Crystal series, and the Varjo XR-4, as well as body trackers such as the HTC Vive Tracker and the Tundra Tracker.

How it works

Main article: Lighthouse

SteamVR Tracking is an optical outside-in tracking method. The reference points are the base stations, small units placed at the edges of the play area that flood the room with structured infrared light. Each base station emits a timing reference and then sweeps a laser plane across the room; the photosensors embedded in the surface of a head-mounted display or controller detect when the sweep reaches them. The time between the reference and the laser strike gives the angle of each sensor relative to the base station, and because the sensors sit at fixed, known positions on the rigid body of the device, the angles from several sensors are combined to recover the device's full position and orientation.

The optical data is fused with an inertial measurement unit on each tracked device. The IMU supplies high-rate motion data between laser sweeps, while the optical system supplies an absolute positional reference that corrects the drift an IMU accumulates on its own. Valve's documentation describes the system as supporting a built-in 1000 Hz IMU and an output tracking rate in the range of 250 Hz to 1 kHz, with up to 32 sensors on a tracked object for full 360-degree coverage. According to Alan Yates, the Valve hardware engineer who led the system's design, the base station emissions are Class 1 (eye-safe), one base station is enough to track a rigid object that also carries an IMU, and the pose calculation can be performed on the tracked device itself rather than on a central computer.

Because the system depends on the photosensors having a clear view of the base stations, it requires line of sight and is vulnerable to occlusion. Placing base stations on opposite sides of the play area reduces blind spots, and adding base stations extends the tracked volume.

Hardware generations

SteamVR Tracking has shipped in two hardware generations whose base stations are not interoperable in a single setup because they synchronize differently.

The first generation, retroactively called SteamVR Tracking 1.0, shipped with the original HTC Vive in 2016. Each 1.0 base station uses two spinning rotors, one sweeping a horizontal laser plane and one sweeping a vertical plane, plus an infrared LED synchronization flash (the Sync Blinker) fired about 60 times per second. A 1.0 setup uses two base stations, which are synchronized either over a wired link or optically.

SteamVR Tracking 2.0, announced by Valve in June 2017 and shipped from 2018, redesigned the base station to use a single rotor that sweeps both axes and encodes timing and an identifier directly onto the laser beam. Encoding the identity on the beam removes the need for a separate synchronization flash and for the base stations to be wired together, which is what allows more than two units to be combined. Valve describes a 2.0 setup as supporting up to four base stations for a play area of about 10 m by 10 m, and lists the SteamVR Base Station 2.0 field of view as roughly 160 degrees horizontal by 115 degrees vertical with a range of about 7 m; two 2.0 base stations cover a play area roughly four times larger than the first generation. The 2.0 system is the one used by the Valve Index, the HTC Vive Pro, and the Bigscreen Beyond, all of which require 2.0 base stations.

SteamVR Tracking generations

Feature	SteamVR Tracking 1.0	SteamVR Tracking 2.0
First shipped	2016 (HTC Vive)	2018 (HTC Vive Pro)
Rotors per base station	Two (one per axis)	One (sweeps both axes)
Synchronization	Infrared LED flash (about 60 Hz)	Data and ID encoded on the laser beam
Maximum base stations	2	4
Field of view (base station)	About 120 degrees	About 160 degrees H by 115 degrees V
Range (per base station)	About 5 m	About 7 m
Play area	Several metres on a side	Up to about 10 m by 10 m
Light-to-digital sensor	Triad Semiconductor TS3633	Triad Semiconductor TS4231

Sensors

The component that lets a device read the base station light is a light-to-digital integrated circuit that takes the analogue signal from a photodiode and converts it into the digital timing data the SteamVR Tracking algorithms need. Valve worked with Triad Semiconductor to define and produce this part. The first-generation TS3633 was made for 1.0 hardware. The second-generation TS4231, which Valve described as offering compatibility with both the new and old base stations, decodes the higher-rate data encoded on 2.0 base station beams while remaining backward compatible with 1.0 hardware. Luke Beno, who worked on this sensor ASIC at Triad (including the TS3633 and TS4231) before founding Tundra Labs in 2018, later built a system-in-package tracking module that integrates the optical sensor with an inertial measurement unit and wireless connectivity.

Licensing program

Valve opened SteamVR Tracking to third-party hardware developers on a royalty-free basis on 4 August 2016, alongside HTC opening parts of the Vive platform. Developers wishing to build SteamVR-tracked hardware sign up as a SteamVR Tracking licensee through Valve's partner portal; Valve charges no licensing fee and states that no certification from Valve is required before shipping a product. Early licensees received hands-on training, originally delivered in person near Valve, and could buy a SteamVR Tracking hardware development kit, which was sold through Triad starting at $595 and included the TS3633-CM1 prototyping module built around the photodiode and sensor chip. The program targets device manufacturers, product designers, and independent developers, and Tundra Labs supplies development hardware to licensees.

Devices and adoption

SteamVR Tracking is used across a range of PC VR headsets and accessories rather than a single product line.

The original HTC Vive (April 2016) shipped with 1.0 base stations, and the HTC Vive Pro (2018) introduced 2.0. The Valve Index (June 2019) uses Base Station 2.0. The Bigscreen Beyond (2023) and its successor the Bigscreen Beyond 2 (shipping from 2025) have no onboard tracking cameras and depend entirely on external 2.0 base stations, with Bigscreen stating in early 2025 that it intended to keep manufacturing the Beyond 2 with SteamVR Tracking for the next two years. Several other PC VR headsets support SteamVR Tracking, including the Pimax Crystal series (via an optional Lighthouse faceplate) and the Varjo XR-4, which offers SteamVR base station tracking as an option for precise positional accuracy.

The system is also used for accessory tracking. The HTC Vive Tracker, introduced in 2017, is a small puck that attaches to objects or the body so they can be tracked inside SteamVR, and the Tundra Tracker from Tundra Labs is a smaller third-party alternative funded through a 2021 crowdfunding campaign that raised over $1 million. The Netherlands company Manus also produces a SteamVR tracker aimed at motion capture, virtual production, and full-body VR.

Current status

As of mid-2026, most mainstream standalone headsets use inside-out tracking with cameras on the headset, but SteamVR Tracking remains the dominant external tracking standard for tethered PC VR aimed at enthusiasts, social VR, and professional users who want body trackers and high positional accuracy. Headsets that ship without onboard tracking, such as the Bigscreen Beyond 2, continue to rely on it, and Valve continues to operate the royalty-free licensing program.