The second travel technique is based on a Microsoft Laser
Mouse 6000 mouse (Fig. 4). Here, the lateral, side-to-side movement
of the mouse rotated the viewpoint along the horizontal
plane, around the vertical axis, (a.k.a. yaw). Rotation speed was
determined by an algorithm with a linear function gain of 25/
cm (with mouse acceleration disabled). The left and right buttons
controlled the fore/aft movement at a constant speed of 5 m/s.
Thus, the mouse travel technique had only two DOFs: one translation
and one rotation.