Apple Motion 4 - Manual (Page 628)

Changes made using the master controls modify the effect of each cell’s parameters
relative to the other cells in the system. This means that for a particle system with three
cells that have different Scale values, increasing the Scale parameter in the Emitter tab
multiplies the Scale value of all three cells by the same percentage. This has the result of
increasing or reducing the size of every particle in the system, while keeping the size of
each particle relative to one another the same.
Original particle system Particle system scaled to 200 percent
For this reason, the master control parameters of multi-cell particle systems appear as
percentages.
Emitter and Cell Parameters
Several parameters in the Emitter tab are identical to those found in the Emitter HUD,
with one difference. While the emission control in the Emitter HUD allows you to
manipulate the Range, Angle, Latitude (3D), Longitude (3D), and Speed parameters using
a single, graphical control, the Emitter tab uses individual controls for each parameter.
Note: There is no way to directly control the animation of individual particles.
Important: The emitter parameters in the Properties and Emitter tabs can be keyframed
to change values over time.
628 Chapter 11 Working with Particles