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The meaning of the x,y,z,w components of a quaternion are similar to the meaning of axis-angle components. the [x,y,z] values represent the axis of rotation. The amount of rotation about that axis in radians is, 2 * acos(w). Keep in mind that Vizard uses a left-handed coordinate system.
All the plugins should return quaternions in the same order (x,y,z,w). I'm assuming most devices will return normalized quaternions as well, but I'm not 100% sure about that.
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