Apple Motion 4 - Manual (Page 605)

Using Particle Systems
Despite their sophistication, particle systems are easy to set up and simple to use. This
section describes how to use pre-made particle systems from the Particle Emitters category
of the Library. Afterward, this section explains how to create a simple particle system of
your own.
Particle Systems and Layer Sizes
Particle systems often create particles that grow or move off the Canvas before they
die. This can make the size of a layer or group much larger than that of the Canvas.
Although the particles are not visible once they move off the Canvas (unless Show Full
View Area is turned on in the View menu), they are still present in the project and are
processed. If you apply a filter to a layer containing growing particles, or use that layer
as a source object, it is recommended that you select the Fixed Resolution checkbox in
the Group tab of the Inspector (available only when a group is the selected object). The
Fixed Resolution parameter allows you to set the specific width and height of a group,
cropping anything beyond those values. For more information, see
Fixing the Size of a
Group .
605 Chapter 11 Working with Particles