• Adobe After Effects Expressions

  Markers to control position In

  Posted by Nathaniel Logan on January 25, 2019 at 4:11 am

  Hi,

  I was wondering is it possible to trigger layer position animation from a marker.

  So the position keyframes are already set but the animation should start only when the marker begins on the same layer.

  Can anyone help me on this expression.

  Much appreciated.
  Thanks

  Nathaniel Logan replied 7 years, 6 months ago 2 Members · 4 Replies
• 4 Replies

• 

  Dan Ebberts

  January 25, 2019 at 5:33 am

  Something like this probably:

  
m = marker;
n = 0;
if (m.numKeys > 0){
n = m.nearestKey(time).index;
if (m.key(n).time > time) n--;
}
t = n > 0 ? time - m.key(n).time : 0;
valueAtTime(key(1).time + t)


  Dan
• 

  Nathaniel Logan

  January 25, 2019 at 11:47 am

  Hi Dan the above snippet works like Charm thank you so much ☺

  Also went through one of your script that triggers the Animation In/Out whichever the 3rd Keyframe is…

  outKey = 3;
  if (time > key(outKey-1).time){
  m = marker;
  n = 0;
  if (m.numKeys > 0){
  n = m.nearestKey(time).index;
  if (m.key(n).time > time) n–;
  }
  t = n > 0 ? time – m.key(n).time : 0;
  valueAtTime(key(outKey).time + t);
  }else{
  value;
  }

  But is it possible to add two markers for a layer and keyframe the Position and Connect the first two keyframes to “In” Marker and next Two keyframes to “Out” Marker.

  Much appreciated.
  Thanks 🙂
• 

  Dan Ebberts

  January 25, 2019 at 5:01 pm

  Something like this maybe:

  
m = marker;
n = 0;
if (m.numKeys > 0){
n = m.nearestKey(time).index;
if (m.key(n).time > time) n--;
}
if (n == 0){
t = key(1).time;
}else if (n == 1){
t = key(1).time + Math.min(time - m.key(1).time,key(2).time-key(1).time);
}else{
t = key(3).time + (time - m.key(2).time);
}
valueAtTime(t)


  Dan
• 

  Nathaniel Logan

  January 25, 2019 at 5:38 pm

  Wonderful Dan, this script works like Charm, you’re the best of the best.

  Thank you so much, ☺ ☺ ☺

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