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I was reading about the stationary frame of reference for seated style experiences for the Hololens 2. I was wondering if the origin is generated at the Centre of the users head, or the center of the screen. I also wanted to know if it is possible through something such as unity to set the stationary frame of reference as an external stationary object? (such as a QR code mounted somewhere in a room) I am trying to create an offline application so azure spatial anchors may not be appropriate. (hence the QR code)
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The application defines the origin. Unity defaults the origin to the user's initial head position and orientation, but that's purely a convenient default. The application can set the origin to a QR code if that makes sense for the app.
Hi Rob, would you also happen to know how one might go about resetting the origin programmatically in unity? I have been exploring the XRInputSubsystem.TryRecenter(); but that does not appear to be working as it requires a subsystem fed into it. From most of the documents i have read the subsystems refer to things like buttons on controllers but i would be unsure how to implement this for the hololens 2 (which has its virtual clicks with different hand motions), would you be able to suggest how I may go about this? Thank you.
Technically you can't change the top-level origin, but if you place everything in your scene under a root object you can use that root object as the "origin" and place it wherever you like. For example, you can place that "origin" object on a world anchor or your QR code.
so i don't think world anchors would be an appropriate solution as my environment is set up in a way where it will not have access to the internet. are you suggesting that i may be able to lock my "origin" object to a recognised QR code? if so would you be able to point me in the direction where i may find the functions to allow me to do this?
See https://learn.microsoft.com/en-us/windows/mixed-reality/develop/platform-capabilities-and-apis/qr-code-tracking#getting-the-coordinate-system-for-a-qr-code for how to get coordinates of a QR code and to create an object at its location. You can then create the rest of your scene using that object as its origin.