Apple Motion 4 - Manual (Page 1071)

As you create new B-Spline control points, keep the following rules in mind:
• The control points you draw influence the shape of the curve from a distance. They do
not lie directly on the surface of the curve.
• To create more detailed curves, create more points. However, it’s a good habit to use
the fewest number of points necessary to create the amount of detail you need. Shapes
with an excessive number of points can be difficult to edit later on.
Simple B-Spline curve Multi-point B-Spline curve
1071 Chapter 17 Using Shapes, Masks, and Paint Strokes