The CMDeviceMotion Class Reference says "Because Core Motion is able to
track a device’s attitude using both the gyroscope and the
accelerometer, it can differentiate between gravity and user
acceleration." But what does it do if the device does not have a
gyroscope... use low-pass and high-pass filters on the accelerometer
data alone?
--
James W. Walker, Innoventive Software LLC
<http://www.frameforge3d.com/>
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