• Adobe After Effects Expressions

  Fade in and out based on markers

  Posted by David Cabestany on September 28, 2022 at 5:20 pm

  I’m trying to write an expression that fades in and out based on the markers in the layer,

  but falling short of it, any help would be greatly appreciated.

  fadeDur = .5;

  n = 0;

  if (marker.key > 0){

  n = marker.key(time).index;

  if (marker.key(n).time > time) n–;

  }

  if (n=1){

  ease(time,n,n+fadeDur,0,value);

  }else

  if (n=2){

  ease(time,n-fadeDur,n,value,0);

  }else{

  value;

  }

  David Cabestany replied 3 years, 7 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  September 28, 2022 at 6:00 pm

  This should work:

  fadeDur = .5;
  m = marker;
  n = 0;
  val = value;
  if (m.numKeys == 1){
    t1 = m.key(1).time;
    val = ease(time,t1,t1+fadeDur,0,value);
  }else if (m.numKeys > 1){
    t1 = m.key(1).time;
    t2 = m.key(2).time;
    if (time < t1 + fadeDur){
      val = ease(time,t1,t1+fadeDur,0,value);
    }else{
      val = ease(time,t2-fadeDur,t2,value,0);
    }
  }
• 

  David Cabestany

  September 28, 2022 at 9:02 pm

  Yes, this works perfectly as usual. Thanks a lot Dan.

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