That’s just awesome! hehe… I was also thinking the same way, I did apply the overshoot to the slider, but it didn’t work without that new line, but now it’s working flawlessly. I really want to thank you very much for helping me with this.

Here is the final version (there are two keyframes in the scale slider):

N = thisComp.layer(“Controls”).effect(“Scale”)(1)
sampleSize = [1,1];
L = thisComp.layer(“Alpha Scale”);
P = L.fromComp(toComp(anchorPoint));
lum = rgbToHsl(L.sampleImage(P,sampleSize/2,true,time))[2];
t = 0;
t1 = N.key(1).time;
t2 = N.key(N.numKeys).time;
if (lum == 1){
t =…

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Just one more thing… if I may to ask.

I just found your Bounce and Overshoot expression:

amp = .1;
freq = 1.5;
decay = 4.0;

n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
n–;
}
}
if (n == 0){
t = 0;
}else{
t = time – key(n).time;
}

if (n > 0){
v = velocityAtTime(key(n).time – thisComp.frameDuration/10);
value +…

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Dan, you were right before. Everything works with the first expression, I was making some changes and didn’t know that “numKeys” also needs to have a FULL PATH if I use another layer’s keys. So, if anyone has the same problem, just to make it clear:

N = thisComp.layer(“Null”).transform.position

THIS IS WRONG:

N.key(numKeys).time

(it’s taking the…

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I don’t know how, that’s why I said only sometimes, really don’t understand. But, thank you very much, you have helped me a lot!

All the best!

Everything is perfect, only sometimes it returns this error:

“this property has no keyframe number 0”

So, if I change:

“t2 = key(numKeys).time”

to

“t2 = key(2).time”

then it’s ok, I don’t know why, and I’ve tried to fix it, but still no luck. Later I will use more than two keyframes, so it would be easier not to count keyframes every time. Could you…

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That’s exactly it… thank you very much, you’ve saved my day! Thanks again!

All the best!

Yes Dan, you are correct, I am struggling with the time. Luminosity is animated, it can be 0 or 1. If it’s 1 then it’s TIME to trigger the animation. How can I calculate the time of “lum” when it goes from 0 to 1? Is this even possible? Please help me, and thanks for the reply! 🙂

Hi all,

I can’t make this expression to work. I have this one layer, with only two keyframes in the scale property, that needs to be triggered by the luminosity of the background layer. So if anyone can give me some directions I would be very grateful. Here is the expression:

 

sampleSize = [1,1];
L = thisComp.layer(“Alpha Scale”);
P =… Read more