• Adobe After Effects Expressions

  Slider Control Incrementing up Every Marker

  Posted by Mark Quinones on June 21, 2022 at 3:40 pm

  Hello, I’m working on an expression that moves a Slider Control up by 40 every time the playhead passes a marker, it’s incrementing up every marker like I want but the linear I’m using doesn’t work, the slider goes up the full amount in 1 frame instead of over half a second like I would expect, what might be causing this?

   

  var moveTime = .5;
  var moveAmount = 40;
  
  if (thisLayer.marker.nearestKey(time).time < time) {
    markerCount = thisLayer.marker.nearestKey(time).index + 1;
  } else markerCount = thisLayer.marker.nearestKey(time).index;
    //Returns the index of the marker ahead of the current time
  
  var moveStart = thisLayer.marker.key(markerCount).time;
  
  if (time = moveStart) {
    scroll = linear(time, moveStart, moveStart + moveTime,(markerCount-1)*moveAmount,markerCount*moveAmount);
  }
  
  scroll;

   

  Mark Quinones replied 4 years, 3 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  June 21, 2022 at 4:23 pm

  I’d do it like this:

  moveTime = .5;
  moveAmount = 40;
  m = marker;
  scroll = 0;
  if (m.numKeys > 0){
    n= m.nearestKey(time).index;
    if (time < m.key(n).time) n--;
    if (n > 0){
      t = time - m.key(n).time;
      scroll = (n-1)*moveAmount + linear(t, 0, moveTime, 0, moveAmount);
    }
  }
  scroll
• 

  Mark Quinones

  June 21, 2022 at 4:38 pm

  This worked perfectly, thanks for your help.

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