Adobe AFTER EFFECTS 5.5 Help Manual page 353

Adobe After Effects Help
Using Help | Contents
How particles first appear on the layer (PB only)
Use the Cannon to create a stream of particles from a specific point on the layer, or use the
Grid to generate a plane of particles. The Layer Exploder and Particle Exploder can create
new particles from existing layers or particles. You can use any combination of particle
generators on the same layer. To learn how to create particles using these three methods,
see "Creating particles (PB only)" on page 354.
Particles generated from the Cannon (left) and from the Grid (right)
Particle content (PB only)
Particle Playground can generate three kinds of particles—dots, footage from a layer, or
text characters. You can specify only one kind of particle per particle generator. For more
information, see "Replacing default particles with a layer (PB only)" on page 358 and
"Replacing default particles with text (PB only)" on page 361.
A
Particles generated from the Cannon A. Dots B. Footage from a layer C. Text characters
A
Particles generated from the Grid A. Dots B. Footage from a layer C. Text characters
The particle generators set the properties of particles at the moment they are created.
After that, particle behavior is influenced by the Gravity, Repel, Wall, Exploder, and
Property Mapper options. For example, if you want particles to stick to grid intersections,
you might use the Static Friction property in the Property Mapper to hold particles in
place; otherwise, as soon as particles are created they will begin moving away from their
original grid positions.
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