Apple Motion 3 User Manual

Page 448

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448

Chapter 5

Using Behaviors

The Apply Mode parameter 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 Randomize behavior to modify a
parameter’s preexisting values.

The Randomize behavior is useful for creating jittery effects, such as twitchy rotation,
flickering opacity, and other effects requiring rapid and varied changes over time that
would be time-consuming to keyframe. The Randomize behavior can be modified with
other behaviors, such as Average and Negate, to exercise further control over the
values being generated.

HUD Control
The HUD lets you adjust the Amount, Multiplier, Frequency, Noisiness, Link (for
multidimensional parameters), Start Offset, and End Offset parameters, as well as
parameter assignment.

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, and is set to Multiplier when the Apply Mode is set
to Multiply. This parameter defines the maximum value the Randomize behavior will
generate.

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 Randomize 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 will generate faster variations, whereas lower values will generate slower
variations.

Noisiness: Adds an additional overlay of random variance to the Frequency you’ve set.
Higher Noisiness values result in more erratic variations in the affected parameter.

Link: This parameter appears when you apply this behavior to a two-dimensional
(such as Scale) or three-dimensional parameter (such as Position) that consists of X, Y,
and/or Z values. Turn this checkbox on to keep the behavior’s effect on each value
proportional.

Affect Subobjects: This parameter only appears when the Randomize behavior is
applied to a parameter of the Sequence Replicator behavior. When Affect Subobjects is
turned on, each object has a different random behavior. When turned off, each object
undergoes the same animation.

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