is it possible to us expression for exponential scale?

[Dan Ebberts]

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)
}else{
  s = v2;
}
[s,s]

Dan

[Andrew Kramer]

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.

thanks
Andrew

[Ryan Chan]

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

[Mike Clasby]

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.