Apple Motion 3 - Manual (Page 703)

Chapter 8 Working with Particles 703
Modifying Emitter Properties
Emitter parameters can be modified in the Properties tab of the Inspector like any
other object in Motion.
Note: The only parameter that appears for cells in the Properties tab of the Inspector is
Timing.
Transform Parameters
As a particle system plays, the cells in the system are duplicated, according to the
parameters for that system, to create each individual particle in the Canvas. Because all
particles emerge relative to the position of the emitter (because the emitter can be a
point, a circle, geometry, a sphere, and so on), changing the emitter’s position in the
Canvas also changes the position of every particle in that system.
The exception to this is if the emitter’s position is animated using a behavior or
keyframes. In this case, particles emerging from the emitter’s position at each frame
continue to move relative to that position, regardless of changes to the emitter’s
position in subsequent frames. This results in a trail of particles following the path of
the emitter.
Origin of particle system after
emitter has been repositioned Origin of particle system