Apple Motion 3 - Manual (Page 738)

738 Chapter 8 Working with Particles
Applying Behaviors to Cells
Simulation behaviors that are applied directly to cells are in turn applied to each
individual particle generated from that cell. This can result in some extremely complex
animations as dozens of particles move according to the behaviors you’ve defined.
Behaviors applied to cells have no effect on the position of the emitter. Parameter
behaviors on a cell only affect particles when they are created.
To apply a behavior to a cell:
m Drag a behavior from the Library to a cell in the Layers tab or Timeline.
The behavior is applied to the cell, and all particles generated from that cell begin to
move according to the parameters of the behavior.
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Tip: If you do not see your expected result when applying behaviors to particle cells, try
turning the Affect Subobjects parameter on or off or selecting a different option from
the Affect pop-up menu in the HUD or Behaviors tab of the Inspector. These
parameters determine whether the entire object (such as the particle emitter) or its
components (such as the particle cells) are affected by the behavior and how an object
interacts with surrounding objects, respectively.
Note: The Affect Subobjects checkbox only appears in the Behaviors tab when the
Throw and Spin behaviors are applied to a group that contains multiple objects, such
as a group, particle emitter, or text.
Applying Parameter Behaviors to Emitters or Cell Parameters
As with all objects in Motion, you can apply Parameter behaviors to the parameters in
the Emitter or Cell tab.
To apply a parameter behavior to an emitter or cell parameter, do one of the
following:
m Drag a behavior from the Library onto an emitter or cell in the Layers tab or Timeline. In
the Apply To section of the Behaviors tab or HUD, choose an option from the Go pop-
up menu.
m Select an emitter or cell in the Layers tab or Timeline, click Add Behavior, and choose a
Parameter behavior. In the Apply To section of the Behaviors tab or HUD, choose an
option from the Go pop-up menu.
m In the Emitter or Particle Cell tab, Control-click a parameter, then choose a Parameter
behavior from the shortcut menu.
Using Particles Behaviors
The Particles category in the Library contains two behaviors specifically for use with the
cells or emitter in a particle system: