• Adobe After Effects Expressions

  Expression help: If X = 1 then do the following…

  Posted by Aharon Rabinowitz on December 6, 2006 at 10:42 pm

  Hey there-

  I am working on a tutorial on expression controls but the control called Checkbox Control is hard to demonstrate practically. It uses a binary value system of off or on, which is really 0 or 1. Now there are some effects and propertues that use this sytem (such as the property in the fractal noise effect called invert), but animating that propery isn’t a common thing for people to do.

  Since the system uses 0 or 1, I was thinking of demonstrating an expression like – If X = 0 then do this, if X = 1 do this.

  So how do I write an If then Statement?

  To set up x properly, I know that I need to write this

  x = thisComp.layer(“Null 2”).effect(“Checkbox Control”)(“Checkbox”);

  after that, I’m lost. I can figure out how to write the part about what should happen, I just don;t know how to write if X = 0 do this, if X = 1 do that.

  Thanks.

  Aharon

  —————————————-
  Aharon Rabinowitz
  aharon(AT)yahoo(DOT)com
  http://www.allbetsareoff.com
  —————————————-
  Creative Cow Master Series DVD
  particleIllusion Fusion Volume 1
  available @ http://www.pIllusionFusion.com

  Aharon Rabinowitz replied 19 years, 8 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  December 6, 2006 at 11:14 pm

  Here’s a simple checkbox for Opacity expression that should get you started:

  x = thisComp.layer(“Null 2”).effect(“Checkbox Control”)(“Checkbox”);
  if (x == 1){
  100;
  }else{
  0;
  }

  Dan
• 

  Aharon Rabinowitz

  December 6, 2006 at 11:25 pm

  Thanks! Very Helpful.

  —————————————-
  Aharon Rabinowitz
  aharon(AT)yahoo(DOT)com
  http://www.allbetsareoff.com
  —————————————-
  Creative Cow Master Series DVD
  particleIllusion Fusion Volume 1
  available @ http://www.pIllusionFusion.com

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