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Re: [sensors] Provide the DeviceOrientation sensor

From: Kenneth Rohde Christiansen via GitHub <sysbot+gh@w3.org>
Date: Mon, 27 Feb 2017 13:07:41 +0000
To: public-device-apis-log@w3.org
Message-ID: <issue_comment.created-282714811-1488200860-sysbot+gh@w3.org>
Quaternions are a very nice and compact way of representing rotations.
 Ie. you can multiply quaternions to apply rotation (though 
non-commutative - due to being rotations). They are basically the 
evolution of complex numbers (which are good for rotations in 2D 
space), and you can easily build a rotation matrix from them. 

Good intro: 

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