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Y Axis Jitter

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This creates a random jittery motion in the Y axis. You can modify probability to make or less jitter, and the pos variable to define how large the jitter is.
After Effects CS3
Text-FX
Expressions

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Just apply the expression/preset on any layer
//applyTo: position
// Y Axis Jitter
probability = 8 ;  //higher is less likely
pos = 50;
val  = random(-probability-2, 1);
m = clamp(val, 0, 1);
y = wiggle(10, pos*m)-position;
value + [0, y[1]]
by Harry J. Frank, graymachine.com


(Min. Version: After Effects CS3, Category: Text-FX, Type: Expressions)
posted by MadDocc on Feb 24, 2010

 

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