VR Tracking Tech: Optical, Laser, or Inside-Out?

What VR tracking means

VR tracking is how a headset knows where you are and where your hands are in 3D space. Every VR headset needs some method to measure position and orientation (6DoF) so that virtual objects stay in place as you move. The technology behind that measurement differs between headset models and generations.

Three main approaches have been used in consumer VR: inside-out tracking, outside-in tracking (often called laser or base station tracking), and optical tracking. Each has its own advantages in setup, tracking volume, and controller compatibility. For a broader overview, see our VR headset guide.

Inside-out tracking: cameras on the headset

Inside-out tracking uses cameras built into the headset to look at the room. The headset compares images from those cameras to figure out its own movement and the position of the controllers. No external sensors or base stations are needed.

This method is the most common in current VR headsets. The VIVE Focus Vision, for example, uses four cameras and an infrared floodlight to track hand movements with 26-point precision, even in dim light. Most standalone headsets from Meta also rely on inside-out tracking. Because the cameras are on the headset, the tracking volume is limited to what the cameras can see, but the setup is simple: put on the headset and go.

Inside-out tracking is also used by the PlayStation VR2, which has cameras on the headset that track the Sense controllers. The main advantage is that you do not need to mount anything on walls or place base stations in the room.

• No external sensors required
• Works out of the box with minimal setup
• Tracking volume depends on the camera field of view
• Common in standalone headsets and PC VR headsets today

Outside-in tracking: base stations and lasers

Outside-in tracking uses base stations placed in the room that emit lasers or infrared light. The headset and controllers have sensors that detect those signals, and the system calculates their position based on the timing of the light pulses.

The Valve Index is a well-known example. It requires at least two base stations (sold separately) that sweep the room with lasers. The headset and controllers have photodiodes that pick up the laser sweeps, allowing sub-millimeter accuracy over a large area. The HTC Vive headsets and older HTC Vive models also use this method.

Because the base stations are fixed in the room, the tracking volume can cover a larger space than inside-out tracking, and the system does not rely on the headset's cameras seeing the environment. The trade-off is the need to set up and power the base stations, and the base stations must have a clear line of sight to the headset and controllers.

• Requires base stations mounted in the room
• Provides a large, consistent tracking volume
• Used by Valve Index, HTC Vive Pro, and older HTC Vive models
• More complex setup than inside-out tracking

Optical tracking: camera-based systems

Optical tracking uses an external camera to watch the headset and controllers, which have colored or infrared lights. The camera tracks the position of those lights to determine movement. This method was used by the original PlayStation VR (PS VR) for the PlayStation 4.

In the original PS VR, the PlayStation Camera tracked the lights on the headset and the PlayStation Move controllers. The system required the camera to be placed in front of the player and had a limited tracking volume compared to inside-out or outside-in methods. The PlayStation VR2 replaced this with inside-out tracking, so optical tracking is now only found on older or discontinued headsets.

Optical tracking is generally less accurate and has a smaller tracking area than the other two methods, but it was a practical solution for early console VR.

• Uses an external camera to track lights on the headset
• Limited tracking volume and accuracy
• Found on original PlayStation VR (PS VR)
• Largely replaced by inside-out tracking in modern headsets

How the methods compare

Each tracking method suits different needs. Inside-out tracking is the easiest to set up and is now the standard for standalone headsets and many PC VR headsets. Outside-in tracking offers a larger tracking volume and is preferred for room-scale setups where you want to move freely without worrying about camera coverage. Optical tracking is mostly a legacy technology.

When choosing a headset, consider whether you want a simple plug-and-play experience or if you are willing to mount base stations for maximum tracking space. The VIVE Focus Vision and most Meta headsets use inside-out tracking. The Valve Index and HTC Vive Pro use outside-in tracking. The original PlayStation VR uses optical tracking, but the PlayStation VR2 has moved to inside-out.

What to pick for your situation

Questions

Do I need base stations for inside-out tracking?

No. Inside-out tracking uses cameras on the headset, so no base stations are required. The headset tracks your position by looking at the room around you.

Can I use inside-out tracking in a dark room?

Most inside-out tracking headsets need some light to see the room. Some models, like the VIVE Focus Vision, include an infrared floodlight that allows tracking in dim conditions. Check the headset's stated features for low-light support.

Which tracking method is more accurate?

Outside-in tracking with base stations can achieve very high positional accuracy because the lasers provide a fixed reference. Inside-out tracking is also accurate for most VR experiences, but its precision depends on the camera quality and software. This site does not compare accuracy figures; both methods are sufficient for gaming and general use.

Is optical tracking still used in new headsets?

No. The original PlayStation VR was the last major headset to use optical tracking. Newer headsets, including the PlayStation VR2, use inside-out tracking. Optical tracking is considered a legacy technology.

Can I use inside-out tracking controllers with a base station headset?

No. Controllers are designed for the same tracking method as the headset. Inside-out controllers have their own tracking lights or cameras, while base station controllers have sensors that detect laser sweeps. They are not interchangeable.

Does the VIVE Focus Vision support base stations?

The VIVE Focus Vision uses inside-out tracking and does not require base stations. It also supports full-body tracking with VIVE Ultimate Trackers that use inside-out tracking, so no base stations are needed for that either.