The Fiber Motion parameters, controlling the fibers’ movement during the lay-down process, are grouped in the Lay Down Step panel.

To refine the result, the available parameters can be used, namely Number of Shifts, Maximum Shift Angle, Number of Rotations per shift, and Maximum Rotation Angle.

Additionally, falling fibers can be deformed when checking Deform fibers and the desired Number of Deformations can be entered.

Throughout the lay-down process, the fibers fall and roll to their final location in the paper structure. During the fall, the fibers shift and rotate as many times as defined by the values of Number of Shifts and Number of Rotations before they come to rest at the bottom of the structure.

Low values for shifts and rotations produce structures with fibers which settle earlier compared to larger values of these parameters, resulting in thicker paper structures. The Maximum Shift Angle and Maximum Rotation Angle restrict the angle that the objects can adopt during the fall with respect to the lay-down plane.

Observe the effect of setting a high or a low Number of Shifts on the final position of fibers and the thickness (Z-direction) of a laid down paper structure.