• Adobe After Effects Expressions

  Text scaling overshoot

  Posted by Mil Malchiodi on January 29, 2014 at 6:26 pm

  I’m trying to animate a text, that have to scale up from 0 to 100 percent. I want each character to scale sequentially (first the number one, then numer two….). Is there an expression for it?

  I think that the expression I need it’s between this one:

  freq = 3;
  decay = 5;
  t = time – inPoint;

  startVal = [0,0];
  endVal = [100,100];
  dur = 0.1;
  if (t < dur){
  linear(t,0,dur,startVal,endVal);
  }else{
  amp = (endVal – startVal)/dur;
  w = freq*Math.PI*2;
  endVal + amp*(Math.sin((t-dur)*w)/Math.exp(decay*(t-dur))/w);
  }

  and this one:

  freq = 3;
  decay = 5;
  maxDelay = 1.0;

  seedRandom(textIndex,true);
  myDelay = random(maxDelay);
  t = time – (inPoint + myDelay);
  startVal = [100,100];
  endVal = [0,0];
  dur = 0.1;
  if (t < dur){
  linear(t,0,dur,startVal,endVal);
  }else{
  amp = (endVal – startVal)/dur;
  w = freq*Math.PI*2;
  endVal + amp*(Math.sin((t-dur)*w)/Math.exp(decay*(t-dur))/w);
  }

  The first one gave me scale, but all characters scale at the same time, and the second one, it’s not correct, ’cause I don’t need it to be random.

  Sorry if you already talk about this in the forum, but I didn’t find it.
  Thanks a lot

  -MiL-

  Mil Malchiodi replied 12 years, 3 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Mil Malchiodi

  January 29, 2014 at 7:58 pm

  Hey George! First of all, thanks so much for the help!

  I did what you told me, we are closer to what I want, but not exactly.
  I animated the scale (animator scale) from 0 to 100. Once I paste the expression, even if it says “0” the first keyframe starts before 0.

  I changed a few values of the expression, but didn’t find the way to start in 0.
  The layer inpoint it’s at the first keyframe. Hope the image helps.

  

  -MiL-
• 

  George Goodman

  January 29, 2014 at 8:11 pm

  Sorry, previous post I made was wrong.

  I think this is what you’re looking for:

  Add a scale animator to your text
  Add an expression selector
  Delete the range selector
  Set the scale of the animator to 0
  Keyframe the amount from 100-0
  Add the expression to the amount

  Play with the position of the keyframes and the values in the expression to get thedesired results

  delay = .1;
tDelay = delay*textIndex;
n = 0;
if (numKeys > 0){
n = nearestKey(time-tDelay).index;
if (key(n).time > time) n--;
}
if (n == 0){
t = 0;
}else{
t = time - key(n).time - tDelay;
}

  if (n > 0){
v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
amp = .05;
freq = 2.0;
decay = 2.0;
valueAtTime(time-tDelay) + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}

  “|_ (°_0) _|”

  Sincerely,

  George
• 

  Mil Malchiodi

  January 29, 2014 at 8:38 pm

  Cool!!!
  The last one was the correct one!

  Thanks sooo much George!!

  -MiL-

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