Jello-Jiggly Expression

In this Quick Tip, Ewan Smith is going to run you through inserting an expression to the properties of an object to give it a Jello-like Wiggle.

After Effects CS4
Text-FX
Expressions

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The main part is the "Wrap"-Effect

Use this expression for the Horizontal Distortion:

warp =effect("Warp")("Horizontal Distortion");
decay = .96;
end= 0;
duration = thisComp.frameDuration;
current = Math.round(time / duration);
amount = 0;
for (f = 1; f <= current; f++){
  difference = warp - end;
  amount = (amount - difference) * decay;
  warp+= amount;
}
warp

And this for the Vertical Distortion

warp =effect("Warp")("Vertical Distortion");
decay = .97;
end=0;
duration = thisComp.frameDuration;
current = Math.round(time / duration);
amount = 0;
for (f = 1; f <= current; f++){
  difference = warp - end;
  amount = (amount - difference) * decay;
  warp+= amount;
}
warp

by Ewan Smith on ae.tutsplus.com