Stop, Track, Wriggle – Apple Motion 4 User Manual
Page 487
Stop
The Stop behavior suspends parameter animation (created by keyframes or applied
behaviors) of an object. For example, if you assign the Stop Parameter behavior to the
Position parameter of an object that is moving across the screen and rotating, the object
ceases to move across the screen but continues to rotate.
Each behavior’s effect on the object is frozen at the first frame of the Stop behavior in
the Timeline. Keyframes that are applied to that parameter cease to have any effect for
the duration of the Stop behavior in the Timeline.
If the Stop behavior is shorter than the object to which it’s applied, all keyframes and
behaviors affecting that channel immediately take effect after the last frame of the Stop
behavior. For more information on using the Stop behavior, see
.
Parameters in the Inspector
Apply To:
The Apply To (Go) pop-up menu shows the parameter being stopped and can
be used to reassign the Stop behavior to another parameter.
HUD Controls
The HUD control allows you to change the parameter assignment.
Track
This behavior allows you to apply tracking data to a parameter of an effect, such as the
center point of the Light Rays filter. For more information on using the Track behavior,
see
.
Wriggle
This behavior works similarly to the Randomize behavior, but with a slower effect.
Note: A Wriggle behavior applied to an Opacity parameter set to 100% does not have
much effect. This is because there isn’t much room to “wriggle.” For a better result, set
the Opacity to 0, or change the Apply Mode to Subtract.
Parameters in the Inspector
Amount/Multiplier:
This parameter is set to Amount when the Apply Mode is set to Add,
Subtract, or Add and Subtract. This parameter is set to Multiplier when the Apply Mode
is set to Multiply. This parameter defines the maximum value that the Wriggle behavior
generates.
Apply Mode:
A pop-up menu that determines how values generated by this behavior
are combined with other behaviors and keyframes that affect the same parameter. This
provides you with different ways of using a Wriggle behavior to modify a parameter’s
preexisting values. The options are Add, Subtract, Multiply, or Add and Subtract.
Frequency:
A slider that lets you adjust the amount of random variation per second.
Higher values generate faster variations, whereas lower values generate slower variations.
487
Chapter 9
Using Behaviors