After Effects Eye Blink Expression

Posted on Tuesday, 28 January 2014

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:

AE Eye Lid Blink Expression

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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Here is another alternative blink expression After Effects example we think works better than the above:

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

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