A simple blink on and off expression

Layer blinking on and off via expression.

After Effects 6
Transitions
Expressions

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Use this expression at opacity.

//applyTo: opacity
blinkSpeed =10;
n = Math.sin(time*blinkSpeed);
if (n<=0) 0 else 100;

Math.sin(x) will always output a number between 1 and -1. As x increases, Math.sin(x) will output an oscillating series of numbers that go back and forth between 1 and -1, forever and ever. As x increases in speed (ie, how fast the numbers are changing), this series will increase in speed.

In the above expression, you see Math.sin(time*blinkSpeed) being assigned to a variable, n. In the next line, there is a simple if/else saying “If n is less than or equal to 0, pass the value of 0 opacity, otherwise pass the value of 100 to opacity.” As n oscillates back and forth to -1 and +1, the if/else statement is creating a value of either 0 or 100.

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Blinking layers expression automation speed

(Min. Version: After Effects 6, Category: Transitions, Type: Expressions)

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posted by MicGyver on Sep 08, 2008

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A simple blink on and off expression

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Wiggle, rubber, bounce, throw, inertia expressions

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