Apple Motion 3 - Manual (Page 718)

718 Chapter 8 Working with Particles
Burst: Particles emerge from a burst pattern. Using the onscreen controls (with the
Adjust Item tool), you can specify the size and location of the burst. The Burst shape
displays additional parameters.
Spiral: Particles emerge from a spiral pattern. Using the onscreen controls (with the
Adjust Item tool), you can specify the size and location of the spiral. The Spiral shape
displays parameters.
Wave: Particles emerge from a waveform. Using the onscreen controls (with the Adjust
Item tool) or the parameters in the Inspector, you can specify the length and location
of the wave. The Wave shape displays additional parameters.