Wiggle Loop

If you wanna wiggle something, and have it be loop-able (for motion backgrounds and whatnot) this is the code for you.

After Effects 7
Useful things
Expressions

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Just set your frequency, amplitude, and looptime and you'll be set.
(if you're unclear about the freq/amp, this wiggle would look like this - .wiggle(.5,20) normally)

freq = .5;
amp = 20;
loopTime = 3;
t = time % loopTime;
wiggle1 = wiggle(freq, amp, 1, 0.5, t);
wiggle2 = wiggle(freq, amp, 1, 0.5, t - loopTime);
linear(t, 0,  loopTime, wiggle1, wiggle2)

by VFX-Phil

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