iOS: Movement Precision in 3D Space

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No, not really. If you integrate the accelerometer values twice you get position but the error is horrible. It is useless in practice.

Here is an explanation why (Google Tech Talk) at 23:20.

What you actually could do is to discover your “hidden object” by changing the orientation of the phone. That works pretty well with just accelerometers and compass. This is exactly what you see in the video posted by colechristensen.

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