Stagger opacity

[Dan Ebberts]

Your expression has a few issues. What are you trying to do exactly (e.g. what do you mean by “stagger opacity”)?

Dan

[Judy Ranelli]

I want layer 1 to go from 0 to 100 opacity over time of 1 second. and once layer one is at 100% opacity then layer 2 would go from 0 to 100 opacity and so forth through the rest of the layers.

[Dan Ebberts]

There are a number of ways to approach it, but one way would be to give each layer this opacity expression:

dur = 1; // 1 second
tStart = (index – 1)*dur;
tEnd = tStart + dur;
linear(time,tStart,tEnd,0,100)

Dan

[Judy Ranelli]

Is there a way to make the expression so that if I adjust the keyframe timing on layer 1, it adjusts for the other layers? For instance if I made the opacity on layer 1 go from 0 to 100 over 45 frames instead of 30… then the timing on the other layers adjusts as well?

[Dan Ebberts]

Something more like this, probably:


p = thisComp.layer(1).transform.opacity;
if (p.numKeys > 1){
dur = p.key(p.numKeys).time;
tStart = (index - 1)*dur;
t = time - tStart;
p.valueAtTime(t);
}else
value


Dan

[Ilya Sire]

Hi Dan, i found this code and how can i make this from 0% and 100% after second variable? Not like fade in just On Off opacity.

Thank you
Sire