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LPVR-AIR transmits images from the server to the HMD through a regular wifi connection. Usually a 5G band is used, in the optimum case we switch to wifi 6E6e. In environments without much wifi interference, ie. other devices using the same wifi bands, this works very well. Crowded wifi environments limit the bandwidth of the used wifi transmission. This can lead to unpredictable loss of image and tracking quality. Examples of crowded spaces are public locations such as exhibition. Beware!
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The Meta Quest series headsets are stand-alone HMDs that integrate all computing hardware in one device. Due to size and heat emission restrictions, the amount of computing power they provide is limited. For the operation of LPVR, significant compute is required to decode the image stream coming from the rendering PC to the HMD. For high resolution images with a high framerate, performance bottlenecks can happen, resulting in reduced image quality or tracking artefacts. we discovered during experiments that turning the internal inside-out tracking of the HMD off, can improve the preformance performance of the rest of the system. Note that in this case, inside-out tracking can’t be used to supplement pose calculation by FusionHub.
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Inside-out tracking: the built-in tracking of the Meta Quest. Advantage of this tracking method: smooth and responsive. Disadvantage: Doesn't work in some environments, no global reference shared with other HMDs.
Outside-in tracking: External camera-based tracking such as ART or Optitrack. Advantages: Very reliable, provides global reference to all HMDs. Disadvantage: Might introduce latency when sending data from tracking server to HMDs.
IMU: Inertial measurement unit containing a gyroscope to measure angular velocity and an accelerometer to measure acceleration of the HMD. IMU data is very responsive and is therefore fused with optical tracking data to improve latency and allow for pose prediction.
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In order to establish high bandwidth communication between the host and Quest 2 / Pro we recommend setting up a 5GHz or for optimum performance a 6GHz (wifi 6e) wifi router with 2 channels per HMD. For our test setup with 3 x Quest 2 connected to a single wifi access point we used the following high speed router:https://www.tp-link.com/us/home-networking/wifi-router/archer-axe300/ We recommend the tp-link AXE16000 quad-band 16-stream wi-fi 6e router.
Network topography
We recommend to set up a very simple network structure, to minimze potential error sources in the installation process as shown in the image below.
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