• Adobe After Effects Expressions

  Triggering An Expression “on off on off etc’ via Markers

  Posted by Victor Nash on December 10, 2010 at 4:09 pm

  Could someone guide me with my current expression. I basically have an expression that begins the pulse of the Opacity when it hits the Marker. I really need to create an “On Off, On Off etc” with each Marker I lay in?

  Thanks!

  n = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time){
n--;
}
}

  if (n == 0){
  value;
  }else{

  f = 3; // frequency
a = 100; // amount
(Math.cos(time * f * 2 * Math.PI) + 1) * (a / 2);
}

  Victor Nash replied 15 years, 4 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  December 10, 2010 at 6:16 pm

  I’m not sure, but this might be what you’re after:

  
n = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time) n--;
}

  if (n %2){
f = 3; // frequency
a = 100; // amount
(Math.cos(time * f * 2 * Math.PI) + 1) * (a / 2);
}else{
value
}


  Dan
• 

  Victor Nash

  December 10, 2010 at 6:24 pm

  Yes! Thanks Dan.

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