Editing Digital compass

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** E.g. artoolkit
** E.g. artoolkit
** Still you cannot get absolute orientation of device
** Still you cannot get absolute orientation of device
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* Initialized orientation + delta orientations (dead reckoning)
+
* Initialized orientation + delta orientations
** Maybe you can initialize the device to a known orientation (e.g. straight north), then use optical flow and/or accelerometer data to extrapolate subsequent orientations
** Maybe you can initialize the device to a known orientation (e.g. straight north), then use optical flow and/or accelerometer data to extrapolate subsequent orientations
* Optical compass + manually dragging an on-screen compass to match
* Optical compass + manually dragging an on-screen compass to match

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