After Effects Eye Blink Expression

Blink expressions for Adobe after effects

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get a random blink action for eyes in After Effects – Two alternative expressions

Blink expression After Effects: To get a random blink action for an eye in After Effects, you need an After Effects Eye Blink Expression. Here is an expression that you can use, you add this After Effects blink expression to your eyelid layers Transform->Opacity value:

After Effects Eye Blink Expression Alt 1

holdTime = .5; // time to hold each position (seconds)

seed = Math.floor(time/holdTime);

seedRandom(seed,true);

hmm = random(0,10);

if (hmm >5){

transform.opacity=0};

else {transform.opacity=100};

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After Effects Eye Blink Expression Alt 2

minSeg = 1;
maxSeg = 3.0;
blinkDur = .25;
fadeTime = .1;
seedRandom(index,true);
segStartTime = -random(minSeg,maxSeg);
segEndTime = segStartTime;
i = 1;

while (time >= segEndTime){
i += 1;
seedRandom(i,true);
segStartTime = segEndTime; segEndTime = segEndTime + random(minSeg,maxSeg);
}

if (time < segStartTime + blinkDur/2) easeOut(time,segStartTime,segStartTime+fadeTime,0,100) else easeIn(time,segStartTime+blinkDur-fadeTime,segStartTime+blinkDur,100,0

Useful resources on the human eye blink

Further analysis of the human spontaneous eye blink rate by a cluster analysis-based approach to categorize individuals with ‘normal’ versus ‘frequent’ eye blink activity.
About Blinking on Wikipedia.
Why do we blink – from Livescience

“It is without a doubt that I can say Anders is a unique animator because his goal is not to finish a project and move on, it’s to make something he enjoys to make and has pride in and the final product shows us his love of animation.” Jeff Rolfzen The Lark and The Loon

Here are some more articles and pages about our work, services and tips & tricks:

After Effects – Wiggle X or Y Axis Only – 5 Easy Expressions
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Animating a head-bob in After Effects

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