Quest 2 and Quest 3 acquire experimental travel modes to make location tracking on aircraft work properly

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Quest 2和Quest 3现在可以在飞机上使用“实验性”旅行模式。

You can add Travel Mode to your headset's Quick Settings by toggling the "Experimental" section of the settings.Metaindicates that you need to be in a stable (rather thanPTC) system software v65 to see this option and to reboot the headset if the option is still not visible. Please note that the Quest ProNot supported, only Quest 2 and Quest 3.

Enabling travel mode will enable location tracking on mobile airplanes. Other modes of transportation, such as trains, are not yet officially supported, but Meta says they will be at some point in the future.

Previously, attempting to use the Quest headset in flight caused all virtual objects and interfaces to fly off in the opposite direction when the airplane changed altitude, speed, or heading, and when hitting bumps, everything shook violently. The only practical way to use Quest in flight is to disable positional tracking, which will also disable perspective and fall back to Oculus Go-style rotation-only 3DoF VR.

Meta says that on certain airlines, the headset will automatically detect that you're flying and suggest that you turn on travel mode, although the company didn't specify which airlines are included.

But why do you need travel mode in the first place?

It is often assumed that the markerless internal tracking systems on helmets, eyeglasses and self-tracking controllers use only cameras, but this is not the case. These systems also rely on an inertial measurement unit (IMU), a chip containing tiny accelerometers and gyroscopes.

While cameras typically run at 30Hz or 60Hz, IMUs typically provide updates at about 1000Hz, allowing for lower latency. However, the IMU can't actually detect absolute motion directly. the accelerometer in the IMU senses acceleration relative to gravity, and you can integrate the acceleration over time to obtain velocities. If you integrate these velocity values again over time, you will get the displacement relative to the original position.

This process is called waypoint extrapolation. From one moment to the next, this is how each helmet and controller tracks itself, and visual aspects like cameras or laser base stations are essentially only used to correct cumulative errors due to the noisy nature of the IMU data. However, in a moving vehicle like an airplane, the accelerometers capture the acceleration of the vehicle itself, thinking that it is the helmet itself that is moving, resulting in sudden and rapid position drift.

Since its release, Apple VisionProIt has a travel mode, which we praised in our review - although we noticed that it interrupts when you look out the window. Interestingly, Meta claims that its travel mode even works while looking out the window. We plan to test the Quest 3's travel mode on an airplane later this month.

source:uploadvr