Expression correction

[Dan Ebberts]

I don’t think that expression will actually do anything. What are you trying to do exactly?

Dan

[Vivien Lemaignan]

Thanks Dan to you answer,
I just want to have a progressive flickering between two keyframe 0 to 100 opacity for a progressive apparition.
Below this expression is running but the opacity value is just 0 or 100.

Thanks for your help Dan

Vivien

//--Flicker On
//Make something flicker to 100% opacity instead of fading in
//Adjust this flicker frequency to your taste
flickerFrequency = 150;
op = value;
if(op > 0 && op < 100){
reverseAmt=100-transform.opacity;
wiggledAmt=wiggle(flickerFrequency,reverseAmt);
roundedAmt=Math.round((wiggledAmt/100));
roundedAmt*100;
}
//--end Flicker On


[Dan Ebberts]

I don’t understand the “between two keyframes” part. Do the keyframes define the duration of the flicker? I’m having trouble picturing what this should look like.

Dan

[Vivien Lemaignan]

Sorry for my unclearness..
Yes the keyframe define the duration
I have 2 keyframe, the first at 0 % of opacity and the second at 100 %, one second later.
For the moment with my expression the flickering is only binary (0 or 100), i want progressive random flickering that is to say : (0, 20, 5, 80, 35, 40…. 100)
Is it clearer for you?
Thanks Dan
Vivien

[Dan Ebberts]

Maybe something like this:


t1 = key(1).time;
t2 = key(2).time;
if (time > t1 && time < t2){
random(value);
}else{
value
}


Dan

[Vivien Lemaignan]

Thanks Dan
It’s almost perfect ☺
Is it possible to change the intensity of flickering with a slider or a value (time per second)?
Thanks a lot Dan

Vivien

[Dan Ebberts]

You could do something like this to get it to change every 2 frames, for example:


f = 2; // change every 2 frames
t1 = key(1).time;
t2 = key(2).time;
if (time > t1 && time < t2){
seed = Math.floor(timeToFrames(time-t1)/f);
seedRandom(seed,true);
random(value);
}else{
value
}


Dan

[Vivien Lemaignan]

Thanks a lot Dan you are the best, it’s perfect!
All best
Vivien