• Adobe After Effects Expressions

  help with expressions

  Posted by Duran1 on June 24, 2006 at 6:41 pm

  HI i’m fairly ne to after effects and epressions. I have been making small motion graphics and i ran into a small snag when trying to add two movement expressions to one camera. the code i’m useing is as follows:

  t = time – key(2).time;
  if (t< 0){ value; }else{ veloc = 18; amplitude = 55; decay = 4; y = amplitude*Math.cos(veloc*t)/Math.exp(decay*t); value + [y,0]; } The problem I am havin is that I have two seperate times when I want this movement to affect different text, but whenever I try anything such as duplicating the code for example After effects does it for one and not the other. This might be a really stupid problem to have but I figure it's better to ask. thanks Duran

  Dan Ebberts

  

  replied 20 years, 3 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  June 24, 2006 at 7:54 pm

  Are you trying to trigger the bounce at two different keyframes? If so, what’s supposed to happen between the keyframes?

  Dan
• 

  Dan Ebberts

  June 24, 2006 at 8:15 pm

  Assuming you don’t want to trigger a vibration at every keyframe, I’d use something like this and just put a layer marker wherever you want the vibration to occur:

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

  if (n == 0){
  value;
  }else{
  t = time – marker.key(n).time;
  veloc = 18;
  amplitude = 55;
  decay = 4;
  y = amplitude*Math.cos(veloc*t)/Math.exp(decay*t);
  value + [y,0];
  }

  Dan

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