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Activity Forums Adobe After Effects Expressions is it possible to us expression for exponential scale?

  • is it possible to us expression for exponential scale?

    Posted by Ryan Chan on April 27, 2005 at 3:21 pm

    hello Dan and everybody, i just wondered if it is possible to use expression to achieve the same result as using exponential scale, so, i can modify the from/to value more easily? say, from 25% scale up to 2500% in 5sec, how to write the expression for this interpolation? thanks


    Mike Clasby replied 19 years, 3 months ago 4 Members · 4 Replies
  • 4 Replies
  • Dan Ebberts

    April 27, 2005 at 3:46 pm

    Try this:

    v1 = 25;
    v2 = 2500;
    t1 = 0; //start time
    t2 = 5; //end time
    if (time <= t1){
      s = v1;
    }else if (time > t1 && time < t2){
      t = time - t1;
      T = t2 - t1;
      k = Math.log(v2/v1)/T;
      s = v1*Math.exp(k*t)
      s = v2;


  • Andrew Kramer

    April 27, 2005 at 3:58 pm

    Dan this is very creative how you solved this. Do you think you can explain it a little bit. Also could this be done with a linked slider.

    so if you keyframed the expression slider value at say 10 and then to 100 equal to scale would be 100-10000.

    this way you could alter it visually with keyframes.


  • Ryan Chan

    April 28, 2005 at 1:53 am

    thanks Dan, you,re incredible! although it is far more complicated than i expected, but i will try to “Digest” this expression, thanks again.

  • Mike Clasby

    April 28, 2005 at 8:01 pm

    Very cool little expression. It looks great on a 3D solid in Custom view 1, so you can actually see what’s going n. Thanks.

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