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(a) The Vive’s reference plane (red) fit to the 3D measurement locations (blue dots) reported by the Vive. The green plane indicates the plane formed by the physical measurement locations. Observed (b) pitch and (c) roll orientations against the predicted values for a physically level headset based on the Vive’s tilted reference plane. Blue dots indicate individual measurements, and the black cross the mean of these measurements for each headset facing direction.
