Apple Motion 5.1.1 - Manual (Page 478)

Chapter 12 Keyframing 478
Constrain a tangent handle’s angle to 45-degree increments
m While holding down the Shift key, drag the handle.
Set curve extrapolation
In addition to setting interpolation for curves between keyframes, you can define how
Motion generates the values before the first keyframe and after the last one. This is known as
extrapolation. When you set a such a method for a parameter, keyframes are added beyond
your original keyframes, which is useful to extend the duration of an effect such as a moving
background. Several extrapolation algorithms are available in the Before First Keyframe and
After First Keyframe submenus of the Animation menu. For more information about the preset
algorithms, see
Curve extrapolation methods on page 479.
Apply an extrapolation method to a parameter before the first keyframe
m Click in the fifth column of the parameter list in the Keyframe Editor to open the
Animation menu for the parameter to change, then choose an item from the Before First
Keyframe submenu.
Apply an extrapolation method to a parameter after the last keyframe
m Click in the fifth column of the parameter list in the Keyframe Editor to open the Animation
shortcut menu for the parameter to change, then choose an item from After Last
Keyframe submenu.
67% resize factor