Wiggle From Previous

This creates a “ follow the leader” effect that works from the bottom up. A follower will tag
along after the previous layer, deviating from the previous path according to the wiggle
properties that are specified in the inputs.

After Effects 7
Useful things
Expressions

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Once applied to a single follower, you can duplicate
the layer as many times as you like and each subsequent copy will follow along, offset from the
last in time and wiggling uniquely. In this expression, the wiggle is based on the position of
the previous layer.
Link Expression Control sliders to lag (to interactively control how bunched together the
layers are), wigfreq (to control the frequency of the wiggle) and wigamp (to control the
amplitude of the wiggle). Apply Expression Control effects to the leader only.
Change the word “Leader” to match the name of the leading layer.
by Michael Natkin & Brian Maffitt

//USE THIS ONE IF THE LAYERS STACK UP FROM BOTTOM LEADER
lagtime = .1;
wigfreq = 3; //wiggle frequency
wigamt = 30; //wiggle amount
adj = (this_comp.num_layers - index) * lagtime;
this_comp.layer(this_layer, 1).wiggle(wigfreq, wigamt, 2, .5,time - adj)
//OR...
//USE THIS ONE IF THE LAYERS STACK DOWN FROM TOP LEADER
lagtime = .1;
wigfreq = 3; //wiggle frequency
wigamt = 30; //wiggle amount
adj = (index - 1) * lagtime;
this_comp.layer(this_layer, -1).wiggle(wigfreq, wigamt, 2, .5,time - adj)

(Min. Version: After Effects 7, Category: Useful things, Type: Expressions)

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