The Big Screen Beyond 2 uses OptiTrack's motion capture technology

The Big Screen Beyond 2 relies on OptiTrack for its motion tracking. OptiTrack is a motion capture system that uses infrared cameras and reflective markers to track the position and movement of your head and controllers in 3D space. This is what allows the headset to know where you're looking and where your hands are, so the virtual environment responds to your movements in real time.

OptiTrack's system works by placing small reflective dots on the headset and controllers. Multiple infrared cameras positioned around your play space detect these markers and calculate their exact location many times per second. The headset then uses this data to update what you see on screen, creating the illusion that you're moving through a virtual world.

This approach differs from some other VR headsets that use inside-out tracking, where cameras built into the headset itself map the environment. OptiTrack is an outside-in system, meaning the tracking hardware sits outside the device you're wearing.

Key Takeaways

  • The Big Screen Beyond 2 uses OptiTrack infrared motion capture, which tracks reflective markers on the headset and controllers.
  • OptiTrack requires multiple cameras positioned around your play space to calculate head and hand position in three dimensions.
  • This outside-in tracking approach means the cameras are external to the headset, not built into it.
  • The system updates tracking data many times per second to keep the virtual environment synchronized with your physical movements.

How OptiTrack cameras detect your movement

OptiTrack's infrared cameras emit light in the infrared spectrum—wavelengths invisible to the human eye. The reflective markers on your headset and controllers bounce this infrared light back to the cameras. Each camera sees the markers from its own angle, and the system triangulates their position by comparing what each camera observes.

The more cameras you have in your setup, the more accurate and stable the tracking becomes. A typical Big Screen Beyond 2 setup uses at least four cameras positioned at different points around the play space. This redundancy means that even if you move in a way that briefly blocks one camera's view, the others can still track you.

The system needs clear line of sight to the markers. If you move behind a wall, a large piece of furniture, or even your own body blocks the markers from all cameras simultaneously, tracking will briefly fail. This is why OptiTrack systems work best in open play spaces without too many obstacles.

Marker placement on the Big Screen Beyond 2

The Big Screen Beyond 2 headset has reflective markers mounted on its exterior in a specific pattern. This pattern allows the OptiTrack system to not only know where the headset is, but also which direction it's facing and how it's rotated. The controllers have their own marker patterns as well.

You don't need to replace or maintain these markers under normal use—they're built into the device. However, if a marker becomes damaged or dirty, it can degrade tracking quality. Keeping the markers clean and free of dust or fingerprints helps maintain accurate tracking.

Setting up OptiTrack for the Big Screen Beyond 2

Initial setup involves placing the infrared cameras around your play space and connecting them to a computer. The OptiTrack software then needs to calibrate—it learns the exact position and angle of each camera so it can accurately triangulate marker positions. This calibration process typically takes 15 to 30 minutes and involves moving a calibration wand through your play space.

After calibration, the system creates a virtual map of your play area. You define the boundaries of where you want to play, and the headset can warn you if you're about to leave that space. The software runs on a PC that communicates with both the cameras and the headset wirelessly or via USB connection.

Camera placement matters significantly. Cameras should be mounted at different heights and angles to avoid blind spots. Mounting them in corners or on walls at roughly 7 to 8 feet high, angled downward, typically works well for most living room setups.

Tracking accuracy and latency

OptiTrack systems can track movement with millimeter-level accuracy when properly calibrated. The system updates tracking information at high frame rates—typically 120 Hz or higher—which means it recalculates your position and orientation 120 times per second or more. This high update rate keeps motion feeling smooth and responsive.

Latency—the delay between your physical movement and the headset updating what you see—is typically very low with OptiTrack, often under 10 milliseconds. This low latency is crucial for VR, because any noticeable delay between your head movement and the visual update can cause motion sickness or make interactions feel unresponsive.

Comparing OptiTrack to other motion tracking systems

Some VR headsets use inside-out tracking, where cameras built into the headset itself map the environment and track your position. This approach requires no external hardware but can be less accurate and more computationally demanding on the headset itself. The Big Screen Beyond 2's choice of OptiTrack means better accuracy at the cost of needing external cameras.

Other systems use lighthouse-based tracking, where external base stations emit light patterns that the headset detects. This approach is simpler to set up than OptiTrack but typically requires fewer cameras and covers a smaller play space. OptiTrack's multi-camera approach scales better to larger areas.

The trade-off with OptiTrack is that you need dedicated space for the cameras and a computer to run the tracking software. If you want to move your setup frequently or use it in different rooms, the camera placement and recalibration process can be time-consuming.

Troubleshooting common OptiTrack issues

If tracking feels jittery or unstable, the most common causes are dirty markers, poor camera calibration, or insufficient lighting. Clean the reflective markers gently with a soft cloth, and check that your infrared cameras haven't been bumped out of position. Recalibrating the system often solves stability problems.

If tracking cuts out in certain areas of your play space, you likely have a blind spot where no camera can see the markers. This usually means repositioning a camera or adding an additional one. Reflective surfaces in the room—mirrors, glass, or shiny furniture—can also confuse the system by reflecting infrared light. Moving or covering these surfaces sometimes helps.

Latency spikes or stuttering usually indicate that your PC isn't keeping up with the tracking data, or that wireless interference is disrupting communication between the cameras and computer. Using a wired USB connection instead of wireless, or moving away from sources of interference like WiFi routers, can improve performance.

Frequently Asked Questions

Can I use the Big Screen Beyond 2 without OptiTrack cameras?

No. The Big Screen Beyond 2 is designed specifically to work with OptiTrack and requires the cameras to function. The headset itself does not have built-in tracking sensors, so it cannot determine its position or orientation without the external OptiTrack system.

How much space do I need for OptiTrack to work well?

OptiTrack works in spaces ranging from small rooms to large areas. A typical living room or bedroom is sufficient. The key requirement is that your play space has clear line of sight between the cameras and the headset markers. Larger spaces may need additional cameras to eliminate blind spots.

Do OptiTrack cameras work in bright sunlight or bright rooms?

Bright infrared light from sunlight can interfere with OptiTrack's infrared cameras. If you're using the system near windows, closing blinds or curtains helps. Indoors under normal artificial lighting, OptiTrack works reliably without special adjustments.

What happens if one of the OptiTrack cameras fails?

Tracking will degrade but usually continue working, especially if you have four or more cameras. With fewer cameras, you'll have larger blind spots and less accurate position data. You should replace a failed camera to restore full tracking quality.

Can I move my OptiTrack setup to a different room?

Yes, but you'll need to recalibrate the system in the new room. The calibration process tells the software where each camera is positioned, so moving cameras to a different space requires running calibration again. This typically takes 15 to 30 minutes.