• Adobe After Effects Expressions

  Java While Loop in AE CS4

  Posted by Dan Seibert on December 29, 2011 at 7:50 pm

  I tend to make things difficult on myself when creating expressions so here’s what I got and correct if I’m just failing.

  I’m trying to change the random seed of a Rough Edges every 5 frames. Rather than go every 5 frames and changing the value, I’m trying to write an expression. I’ve been testing the expression a Numbers effect so I can have a text box that shows me what’s going on. Well I know you can use some Java in AE so I went, “Hey! How about a while loop?” Well… I whipped up this expression and for whatever reason it keeps changing every frame.

  So… what’s not working here?

  if(time = 0){
x = random()*10;
v = Math.round(x);
}else{
i=2;
w=valueAtTime(time-1);
while(i<=4){
x=valueAtTime(time-i);
if(x=w){
fiveframes = false;
i++;
}else{
fiveframes = true;
i = 5;
}
}
if(fiveframes = true){
x=random()*10;
v=Math.round(x);
}else{
v=w;
}
}
v;

  You Don’t Say! Media
  Director – Producer – Editor

  MacBook Pro 2009
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  Adobe Production Suite CS4

  Dan Seibert replied 14 years, 4 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Dan Seibert

  December 29, 2011 at 7:53 pm

  Nevermind. I figured what I was doing wrong. I just need to figure out how to return the time on the comp. But still having the same issue.

  You Don’t Say! Media
  Director – Producer – Editor

  MacBook Pro 2009
  Mac OS X 10.6.8
  2.8 Ghz Intel Core 2 Duo
  4 GB 1067 MHz DDR3
  NVIDIA GeForce 9400M (256MB)
  NVIDIA GeForce 9600M GT (512MB)
  Apple Final Cut Studio 3
  Adobe Production Suite CS4
• 

  Dan Ebberts

  December 29, 2011 at 8:27 pm

  Try this:

  Math.floor(timeToFrames(time)/5)

  Dan
• 

  Dan Seibert

  December 29, 2011 at 8:50 pm

  Brilliant! Worked like a charm! Expressions and scripting are definitely on my to learn list. Thanks a lot!

  You Don’t Say! Media
  Director – Producer – Editor

  MacBook Pro 2009
  Mac OS X 10.6.8
  2.8 Ghz Intel Core 2 Duo
  4 GB 1067 MHz DDR3
  NVIDIA GeForce 9400M (256MB)
  NVIDIA GeForce 9600M GT (512MB)
  Apple Final Cut Studio 3
  Adobe Production Suite CS4

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