• Adobe After Effects Expressions

  Scale Relative to X/Y Position with negative values

  Posted by Ian Thomson on October 16, 2008 at 4:33 pm

  temp=effect("Separate XYZ Position") ("X Position")+100;
  [temp,temp,temp]

  Hi!

  I am new to expressions; but I am trying to set up a comp that will automatically scale the image relative to X and Y sliders.

  My expression works fine for values greater than 0 but how can I keep the scale value positive if the X slider goes into the negative range?

  I have not gotten to the Y value yet!

  Any help is appreciated!!
  Thanks,
  Ian

  Ian Thomson replied 17 years, 7 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Brendan Mccullough

  October 16, 2008 at 8:29 pm

  temp=effect("Separate XYZ Position") ("X Position")+100;
  if(temp<0) temp *= -1;
  [temp,temp,temp]

  You want to check if the value goes below 0, and if it does, multiply it by -1, which will make it positive. Just apply the concept to any of your variable you want to keep positive.
• 

  Ian Thomson

  October 16, 2008 at 9:01 pm

  Awesome! Thanks for the reply! I came up with a similar line of code that was much more convoluted!

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