• Adobe After Effects Expressions

  if expression

  Posted by Alexander Weil on May 13, 2014 at 3:40 pm

  hey
  i’m not an expression expert but i know a little bit and what i dont know i get from this great forum.
  at the moment i got an scale over time expression.
  its working but i want to have more control over it.
  i want to decide between scale from “in- to outpoint” and “scale over a specific time” with a simple checkbox

  this is my code

  how can i get the the solution from this if express into my “scaleUpTime” ?

  scaleUpTime = if (effect("Checkbox")("Checkbox") == 1) a
  else aa ;

  this doesnt work.
  i had this question very often but always found a way to do it in a different way

  i’m pretty sorry for my bad english 🙁

  per = value[0,0]+(value[0,0]/100)*effect("Scale over Time Percent")("Slider");
a = effect("time")("Slider") ; //time control via slider
aa = outPoint-inPoint;

  if (effect("Checkbox")("Checkbox") == 1) a
  else aa

  startScale = value[0,0]; // percent of Scale at start
  endScale = per ; // percent of Scale at end
  scaleUpTime = 3; // time to scale up from inPoint in seconds

  s = [endScale - startScale] /scaleUpTime;
  sx = startScale + ((time-inPoint) * s);

  ss = clamp(sx,endScale,startScale);

  [ss,ss]

  Alexander Weil replied 12 years ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  May 13, 2014 at 4:33 pm

  Basically, I guess you’d just replace this:

  scaleUpTime = 3;

  with this:

  if (effect(“Checkbox”)(“Checkbox”) == 1){
  scaleUpTime = a;
  }else{
  scaleUpTime = aa;
  }

  or this more compact version:

  scaleUpTime = (effect(“Checkbox”)(“Checkbox”) == 1) ? a : aa;

  Dan
• 

  Alexander Weil

  May 14, 2014 at 7:46 am

  its so simple … thanks a lot dan !

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