Apple Motion 4 - Manual (Page 659)

This example uses the Flare01 image from the Particle Images subcategory in the Content
category of the Library. This is a small image of a lens flare against black, with a built-in
alpha channel.
2 With the flare object selected, click the Make Particles icon in the Toolbar (or press E).
An emitter is added to the project, but nothing happens yet because the playhead is at
the first frame of the project, and only one particle has been created. Move the playhead
forward a few seconds to view the particle system at a frame where more particles have
been generated. You can also play the project while you make your modifications to the
particle system.
3 To create a variety of particles, place additional layers into the emitter you just created.
The easiest way to do this is to drag each additional layer you want to use into the group
containing the emitter.
Note: If you do not have any additional images in your project, you can create them in
the project or search the Content category in the Library for images.
Next, drag the new layer either onto the emitter, or below it (but not onto an existing
cell). This example uses the Spark12 file, also located in the Content folder in the Library.
659 Chapter 11 Working with Particles