Adobe AFTER EFFECTS 5.5 Help Manual page 367

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operator such as Add, each time a particle passes over a different layer map pixel, the
value of the layer map pixel is added to the original value of the particle.
The white circle was placed in a composition, and its position was animated.
The white circle composition was used as a map in the Persistent Property Mapper and was
associated with the scale of the particles.
The white circle composition was used as a map in the Ephemeral Property Mapper and was
associated with the scale of the particles.
For more information, see "Using Property Mappers (PB only)" on page 367.
Using Property Mappers (PB only)
In combination with keyframes, the Property Mapper options provide complete control
over individual particle properties in space and time. Using layer maps, you can change
particle properties at any location within a frame. By applying keyframes to Property
Mapper options and animating a layer map, you can control how particle properties
change.
To set particle properties:
1 In the Effect Controls window under Particle Playground, expand the Persistent
Property Mapper or Ephemeral Property Mapper. You can use one or both as necessary.
2 For Use Layer as Map, choose a layer map to use as the source for values that modify
particle values. The layer map must be part of the composition. For more information, see
"About layer maps (PB only)" on page 374.
3 To apply the effect to a subset of particles, specify the Affects properties as necessary
(see "Using Affects options to specify particles (PB only)" on page 372).
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