Adobe AFTER EFFECTS 5.5 Help Manual page 376

Adobe After Effects Help
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If you want particles to be visible in front of the layer map, make sure that the layer with
•
Particle Playground applied is in front of the layer map.
If you don't want the layer map to be visible, hide it by clicking the layer's eye icon ( ) in
•
the Timeline window.
Animating a layer map (PB only)
A layer map is often used as a stationary layer of the same dimensions as its destination
layer. The value of each pixel in the layer map applies only to one specific pixel at the corre-
sponding position in the destination layer. However, when you animate a layer, the
appearance of the pixels in the destination layer changes depending on which layer-map
pixel corresponds to it at a particular point in time. Layer maps are often animated so that
the layer map effect appears to sweep through the destination layer.
A layer map larger than the frame, rotated to animate value changes in the layer that uses it
The result of the layer map above associated with the Scale property of particles—brighter values
create bigger particles, and darker values create smaller particles
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