Apple Motion 4 - Manual (Page 480)

HUD Controls
The HUD lets you adjust the Phase, Amplitude, Speed, and Half Range parameters as well
as change the parameter assignment of the Oscillate behavior.
Related Behaviors
• Ramp
• Rate
Creating a Decaying Oscillation
When you are oscillating an object’s rotation or position, a common effect is to “decay”
or “dampen” the animation over time. This means that the animation gradually slows or
comes to a stop. You can achieve this effect using keyframes to slow the amplitude of
the oscillation.
To decay an oscillating rotation using keyframes
1 Go to the frame where you want the animation to begin, then enable Record (press A).
2 Set the Amplitude value to the maximum value you want to use in your project.
Note: When Record is enabled, any value change to a parameter using the Inspector,
HUD, or Canvas creates a keyframe.
3 Go to the frame where you want the animation to come to a stop and set the Amplitude
value to 0.
When the object is selected, you can see the dampening of the animation—caused by
the keyframed Amplitude parameter—in the Keyframe Editor (when Animated is chosen
from the Show pop-up menu).
480 Chapter 9 Using Behaviors