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If inside-out tracking is not being used, we recommend to switch headset tracking off ie. switch to 3DOF tracking in the Quest system settings. This will free additional CPU performance for the decoding of the video stream and therefore improve image quality.
When powering-up or re-starting the HMD, it will automatically turn headset tracking to ON. If not needed, turn headset tracking to OFF to save computing resources.
When powering-up or re-starting the HMD, it will not automatically connect to a previously saved network, if the network is not connected to the internet. In this case manually connect to the designated access point after start-up. Internet is not needed for operation, this is a bug in Meta’s firmware.
To reduce impact of latency and jitter from optical tracking, turn on some smoothing and predicting prediction in the ART DTrack or Optitrack Motive settings.
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The FusionHub GUI client and ALVR server can be started on the host PC without further installation, they can be run right out of the deployment folder.
Meta Quest 2 / Pro
Install the SideQuest client Advanced Installer that allows you to sideload APK files to your HMD. The headset needs to be in developer mode. Follow the instructions the SideQuest client shows you or refer to this page.
Start-up
FusionHub
Start FusionHub on the HMD. A window showing the FusionHub console output should open.
Start the FusionHub GUI client on the host computer
Connect the GUI client to FusionHub on the HMD. Make sure HMD and host are in the same subnet. Enter the the correct IP of the HMD in the client before pressing connect.
Adjust parameter blocks as needed. Refer to the description of FusionHub BASE for configuration options. Note the following input and output ports that are hard-coded in the ALVR FusionHub API layer. These are already correctly set in the default configuration file installed with the FusionHub APK, so usually there is no need to change them.
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In order to avoid excessive buffering and data loss, make sure to reduce the amount of data being streamed from Motive. We recommend the streaming settings below. Make sure to set the local interface IP to the IP of the network connection that is being used for communicating with the HMD. It is a common mistake to not set this IP correctly. If the correct IP doesn’t show up, restart Motive.
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Intercalibration
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This s is under construction, please use with caution. |
Example videos
Motive
Intercalibration tool: https://www.dropbox.com/scl/fi/1nkt3acbq69omehzz0j28/Intercalibration-tool-cryptolens.mp4?rlkey=qtg49h7kzbhcs4cz32yrnx7vn&dl=0
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Enter adb logcat | findstr fusionhub to stream log data from the device to your command line. Only data from the FusionHubLauncher application will be displayed. The initialization log will be displayed when FusionHubLauncher is first started and everytime you restart it using the Restart button in the GUI.
Challenges and limitations of using
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Meta Quest HMDs
External pose input / internal late latching conflict
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Therefore we tried to find a compromise between image stability and late latching capability. If this compromise works well, strongly depends on user requirements and quality of the wifi connection established to the HMD. A perfect solution is unfortunatly not possible without support from the HMD manufacturer Meta.
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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 6E. In environemnts 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!
The Meta Quest firmware doesn't allow using a wired ethernet connection to mitigate the issue to provide a quick fix to this problem in urgent situations. Again, a clean execution of this project is prevented by inflexibility of Meta's software. Unfortunately there are not alterntive no alternative wireless HMDs on the market that allow the modifications we need for an optimum implementation.
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