Location based compass orientation is incorrect. It always says North is direction when starting up. about ar.js HOT 3 OPEN

It appears that this is know. There was a MR that was not merged that seems to help but enabling the webkitcompassheading. #466

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It looks to me like iOS no longer supports the compass deviceorientationabsolute event. It only supports the deviceorientation event and that seems to reset with the context in some way. In the basic example when you tap on a cube when it returns the device orientation resets with alpha = 0 regardless of the direction facing.
I believe on ios you now need to support the webkitcompassheading event to know which way the phone is facing absolutely.
https://developer.apple.com/documentation/webkitjs/deviceorientationevent/1804777-webkitcompassheading

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We really need developers who have an iOS device, this will help progress the iOS issues and allow the merging of #466.

Also see #278 and #603.

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