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In starting a session, we create a reference space such that the headset is at the same location in the scene as the non-VR camera's position. Furthermore, the space turns so that the headset is looking in the same heading as the non-VR camera was. It's not fully aligned, we don't want to turn looking forward into looking down. We make sure that the scene's up frame is still parallel with the direction of Earth's gravity.
Incidentally beef up the test html to provide testing and information about more of the functionality.