Random Wiggle Opacity from 100% to 0%

[Dan Ebberts]

Something like this should work:

wiggle(1,100) < 100 ? 0 : 100

Dan

[Kuba Lu]

It still makes it flicker

hmm…

[Dan Ebberts]

sorry, I misunderstood. Try this one:

seedRandom(index,true);
if (time > random(thisComp.duration)) 0 else 100

Dan

[Kuba Lu]

Jeez !!!

That works. Thanks so much Dan!

Do you know if it’s possible to change the opacity across 4 frames so it fades out ?

Cheers !

Kuba

[Dan Ebberts]

This should work:

seedRandom(index,true);
t = random(thisComp.duration);
ease(time,t,t+thisComp.frameDuration*4,100,0)

Dan

[Kuba Lu]

You’re a genius !

[Reynoud Van der molen]

Hi Dan,

I saw the incredible handy expression you created for Kuba, and I used for a similair project with a skyline and a bunch of layers.
Now the project is evolving and I was wondering, since I am fairly new to expressions in AE, is there a easy add to let the opacity wiggle between 100% and 0% at multiple random moments.
So to more clear: it would not just turn on or off once, but sometimes it would turn on and some times it would turn on, randomly. Or if it is easier with an predetermined frequency I can alter?

Kind Regards,

Reynoud
Studio NOUD

[Pierrick Allan]

Hello, and thank you for the amazing help.

the expression “wiggle(1,100) < 100 ? 0 : 100” is what i was looking for, but it’s a bit brutal. How can I add smoothing to it? For it to change from 0 to 100 and vice versa but with 4 frames of transition?

I’ve tried to add something like seedRandom(time*5); but it doesn’t work

Thank you so much for your help,
Best,
Pierrick

[Dan Ebberts]

Try this:


fadeTime = framesToTime(4);
curState = wiggle(1,100) < 100;
t = thisComp.frameDuration
while (curState == wiggle(1,100,1,0.5,time-t) < 100){
t += thisComp.frameDuration;
}
tt = time -t;
if (curState){
linear(time,tt,tt+fadeTime,100,0);
}else{
linear(time,tt,tt+fadeTime,0,100);
}


Dan

[Pierrick Allan]

Thank you Dan ! This worked perfectly and I was able to finish my project on time !
For the others who might want to avoid expressions, i found out that you can do the same with the effect “Strobe Light”