Apple Motion 5.1.1 - Manual (Page 527)

Chapter 14 Particles 527
Some parameters in the Emitter Inspector depend on the settings of other parameters. All
combinations of parameters are described below.
Emitter parameters in the Inspector
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Shape: The first parameter in the Emitter Inspector is the Shape pop-up menu. When 3D is
turned off, nine options are available. When the 3D checkbox is selected, two additional shapes
become available. Different shapes significantly alter the distribution of generated particles.
When you choose an emitter shape, different Emitter Inspector parameters appear that are
unique to that shape. For example, when Rectangle is the selected shape, Outline, Tile Fill, and
Random Fill become available in the Arrangement options. When Spiral is the selected shape,
the Arrangement parameter goes away and new parameters such as Radius, Number of Arms,
and Twists become available. These different parameters provide additional control over the
distribution of particles.
In addition, when the 3D checkbox is selected, the Render Particles, Emission Latitude,
Emission Longitude, and Depth Ordered parameters become available for all emitter shapes.
The Shape pop-up menu contains the following items:
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Point: This is the simplest emitter shape and is the default shape for new emitters. It specifies
a single point of emission for a particle system. There are no additional parameters for the
Point shape.
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