hasOrientation (& hasPosition) flags

[mkeblx]

What is the use case of these VRDisplayCapabilities flags on VRDisplay? Especially hasOrientation as hard to imagine HMD not having orientation tracking.

Also note specifically renamed from VRDevice to VRDisplay to focus spec on covering use case of HMDs (mainly) and not generic tracked VR devices.

Additionally can be figured out by null or not state of orientation and position data.

[toji]

The difference between a null position and hasPositionhas been explained by @kearwood in the past with the "Cat scenario". If a cat walks in front of my tracking camera/laser box and tracking drops, it may appear that the device has no position tracking at all if all you are looking at is the pose data. hasPosition == true && pose.position == null says "I have the ability to track your position, I'm just not able to do it right now."

[cvan]

Moved to immersive-web/webxr#38