Support scenarios that do not use OVRCameraRig

[camnewnham]

Related to #2

We've recently implemented the experimental QR detection from MRUK. It works very well and we're excited to public release! This functionality will make a huge difference to how our users can interact with the world.

This post is part request and part FYI for others.

Our app uses an OpenXR setup with a camera rig based on XROrigin. We found that the main thing stopping MRUK QR detection working out of the box was MRUK's OVRCameraRig _cameraRig reference along with OVRCameraRig.trackingSpace. Tracing it through QR detection, only the transforms were used and hence they need not be OVR specific objects.

The workaround for this:

• Ensure MRUK and OVRManager are in scene and appropriately configured.
• Create a class a class that extends OVRCameraRig
• Override unity functions (Start, Update etc...) with blank functions
• Use reflection (in Awake) to set the private value of trackingSpace to an appropriate ancestor of the main camera (i.e. Camera Offset)

Shim class here.

The request:

• Allow the root transform and/or tracking space to be overridden in the editor (could default to OVRCameraRig if unspecified)

[lorenzoGoldoni]

Thanks for sharing your workaround and suggestion. As you noted, this use case isn’t currently supported out of the box, but we’ll keep your request in mind!

[realThirdpartycookie]

I would second this. QR code / marker tracking is very important for our project.
Are there any plans/timeframe to bind this to the new OpenXR Spatial extensions (XR_EXT_spatial_marker_tracking) in the near future?

[TudorJude]

Are there any plans/timeframe to bind this to the new OpenXR Spatial extensions (XR_EXT_spatial_marker_tracking) in the near future?

Markers will use the XR_EXT_spatial_marker_tracking extension in an upcoming release.

[realThirdpartycookie]

Very nice, so I can already code against them. Thank you!

[camnewnham]

Hi @lorenzoGoldoni is there any indication if/when this might come out of experimental access?