Move the phone and the shape stays put — sideways, up and down, and in depth. Pull the device away from your face and it grows; bring it closer and it shrinks.
Start from the presets at the top of the settings. Device sets the physical scale — how far it may travel, how much noise to expect, how you hold it. Smoothness sets the time constants. They are independent, so pick one of each.
Turn and tilt the device for a few seconds after starting; the ring at the centre fills as the rotation model is learned. Tap anywhere to recentre.
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Scale is 1 − z / e.
Corrects 57 % of a step within 100 ms.
Rectangle: — × — px.
Settled offset from a 0.03 m/s² residual: 4 mm.
Roll axis: detecting.