Apple Motion 4 - Manual (Page 637)

Number of Arms: This parameter, available when Burst or Spiral is chosen in the Shape
pop-up menu, defines the number of branches from which particles are emitted. The
default value is 3.
Spiral emitter shape set to default Number of
Arms and Twists Spiral emitter shape with default Arms and
Twists set to .70
Amplitude: This parameter, available when Wave is chosen in the Shape pop-up menu,
defines half the distance from the highest point to the lowest point in the wave. Higher
values result in more extreme waves.
Frequency: This parameter, available when Wave is chosen in the Shape pop-up menu,
defines the number of waves. Higher values result in more waves.
Phase: This parameter, available when Wave is chosen in the Shape pop-up menu, defines
the degrees of the offset of the waves from the start and end points of the path. When
set to 0 degrees (default), the wave begins and ends at half the distance from the highest
point to the lowest point in the wave. When set to 90 degrees, the wave begins and ends
at the highest point in the wave. When set to 90 degrees, the wave begins at the lowest
point in the wave. When set to 180 degrees, the waves are the same as 0 degrees, but
inverted.
Damping: This parameter, available when Wave is chosen in the Shape pop-up menu,
determines the direction of progressive diminishment of the oscillation of the wave.
Positive damping values diminish the wave forward (from left to right); negative values
diminish the wave backward (from right to left).
Offset: This parameter is available when any of the following is chosen in the Shape
pop-up menu: Line, Rectangle (with Arrangement set to Outline), Circle (with Arrangement
set to Outline), Burst, Spiral, Wave, Geometry, or Image. Offsets either the emitter itself
or the particles generated on the shape. For example, when the emitter Shape is a Line,
changing the Offset value moves the emitter’s position in the Canvas. When the emitter
Shape is a Rectangle and Pattern is set to Outline, changing the Offset value moves the
particles along the edge of the shape.
637 Chapter 11 Working with Particles