Apple Motion 5.1.1 - Manual (Page 547)

Chapter 14 Particles 547
Apply behaviors to cells
Simulation behaviors applied to cells are in turn applied to each 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.
Apply a behavior to a cell
m Drag a behavior from the Library to a cell in the Layers list 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.
Tip: If you do not see your expected result when applying behaviors to particle cells, try
selecting or deselecting the Affect Subobjects checkbox (in the Behaviors Inspector) or selecting
a different option from the Affect pop-up menu in the HUD or Behaviors 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. (The Affect Subobjects checkbox only appears in the Behaviors
Inspector when the Throw and Spin behaviors are applied to a group that contains multiple
objects, such as a group, particle emitter, or text.)
Apply parameter behaviors to emitter or cell parameters
As with all objects in Motion, you can apply Parameter behaviors to parameters in the Emitter or
Particle Cell Inspector.
Apply a Parameter behavior to an emitter or cell parameter
Do one of the following:
m Drag a behavior from the Parameter category in the Library onto an emitter or cell in the Layers
list or Timeline. In the Apply To section of the Behaviors Inspector or HUD, choose an option from
the Go pop-up menu.
m Select an emitter or cell in the Layers list or Timeline, then choose a Parameter behavior from the
Add Behavior pop-up menu in the toolbar. In the Apply To section of the Behaviors Inspector or
HUD, choose an option from the Go pop-up menu.
m In the Emitter or Particle Cell Inspector, Control-click a parameter, then choose a Parameter
behavior from the shortcut menu.
Apply Particles behaviors to emitters or cells
The Particles category in the Library contains two behaviors specifically for use with the cells or
emitter in a particle system:
•
Scale Over Life: This behavior lets you grow or shrink the particles in a system over the duration
of each particle’s life. It has one main parameter and three optional parameters that appear
depending on the selected Increment Type.
•
Spin Over Life: This behavior lets you spin the particles in a system over the duration of each
particle’s life.
Apply a Particles behavior to an emitter or cell
Do one of the following:
m Drag a behavior from the Particles category in the Library onto an emitter or cell in the Layers list
or Timeline.
m Select an emitter or cell in the Layers list or Timeline, then choose a Particles behavior from the
Add Behavior pop-up menu in the toolbar.
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