Apple Motion 4 - Manual (Page 729)

c If necessary, adjust the Radius parameter so that elements are not cut off in the Canvas.
In this example, Radius is set to 145.
d Increase the Points value until the elements overlap.
An element is created at every point on the shape. In this example, Points is set to 30.
e In the Cell Controls section of the Replicator tab, select Align Angle.
Based on the location of the anchor point of the source layer, the replicator elements
automatically rotate to match the curve of the circle.
729 Chapter 12 Using the Replicator