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Start Offset: A slider that lets you delay the beginning of the behavior’s effect relative
to the first frame of its position in the Timeline. Adjust this parameter to make the behavior
start later. This parameter is measured in frames.
End Offset: A slider that lets you offset the end of the behavior’s effect relative to the
last frame of its position in the Timeline, in frames. Adjust this parameter to make the
behavior stop before the actual end of the behavior in the Timeline. Using this slider to
stop the effect, instead of trimming the end of the behavior in the Timeline, freezes the
last random value generated by this behavior for the remaining duration of the object.
Trimming the end of the behavior resets the parameter to its original value.
Apply To: The Apply To pop-up menu shows the parameter affected and can be used
to reassign the behavior to another parameter.
HUD Controls
The HUD lets you adjust the Amount, Multiplier, Frequency, Wriggle Offset, Noisiness,
Link (for multidimensional parameters), Start Offset, and End Offset parameters, as well
as change the parameter assignment.
Related Behaviors
• Random Motion
• Randomize
Retiming Behaviors
Retiming behaviors are applied to image sequences, QuickTime movies, and clone layers
to change their timing. Retiming effects include creating hold frames, changing playback
rate, reversing a clip, creating stutter or strobe effects, and so on.
Important: Retiming behaviors can only be applied to QuickTime movies, image
sequences, or clone layers. In other words, a Retiming behavior cannot be applied to a
particle emitter, but it can be applied to an instance of the particle emitter. For more
information on cloning layers, see Making Clone Layers.
Retiming Behaviors Versus Timing Controls in the Inspector
When a clip is selected, a group of Timing parameters appears in the Properties Inspector.
These controls allow you to do some of the same effects as the Retiming behaviors,
such as slowing down or speeding up, looping, or reversing a clip; however, the Timing
controls affect the entire clip. The power of the Retiming behaviors is that you can define
which portion of the clip is affected by the behavior. Any timing changes made to a clip
using the Inspector’s Timing controls are respected by the Retiming behaviors. For
example, if you changed the speed of the clip to 50% in the Timing parameters, a
Retiming behavior uses that half-speed clip as its source. For more information on Timing
controls in the Inspector, see Retiming.
446 Chapter 9 Using Behaviors