What you always wanted to know about tracking that Meta guides never explained clearly.

I am very happy about the discover I've just made today, but I feel a bit annoyed about the fact I didn't find any detailed explanations of that over the Meta documentations.

I've started VR development for oculus 2 monthes ago. As I didn't find anywhere something giving accurate knowledges about how to align VR scene with real world, I finally passed 2 or 3 weeks building a system using passthrough + spatial anchors to allow alignment setup before loading the game. It works pretty nice BUT it makes the project bigger and slower because not optimized.

Today, I decided to start my own investigations about the way the world axis is aligned when drawing a guardian area. Here the happy conclusions:

-Erase any Guardian setup previously set.
-Define a new guardian area as a clean square or rectangular shape (not millimetric but the overall shape should be an obvious square or rectangle).
- Important thing is HERE: when you finish drawing the shape, before to confirm the draw, LOOK into the direction of the edge you want to be the X axis of your VR scene. This edge will be perpendicular to the Z axis of the VR scene, and the OVRCameraRig object will be postioned to the center of this area (as mentionned in guide) and looking Z forward to that edge (not mentionned).
- Don't forget to set OVR Manager to "Stage" mode (as mentionned in guide).

Now your Scene will keep track of that guardian setup and alway keeps the axis alignment.