• Adobe After Effects Expressions

  Loop animation via expression.

  Posted by Konstantin Kartashov on July 9, 2016 at 1:10 pm

  Hi everybody!
  I`m trying to link playback of one object`s animation cycle to movement of another one. I use Duik morpher to link all keyframes to one slider and link this slider to x-position of null object. The point is to make it work in cycle. I actually done it (may be in a little weird way). See the code below.

  Here 15 is a length of animation cycle. It works, but have one issue – when position goes lower zero the loop stops playing. I understand why it behave this way, but don`t know how to fix it.
  P.S. sorry for cyrillic letters in the code, unfortunately I have russian version of AE. Пусто 1 equals Null 1.

  if ((thisComp.layer("Пусто 1").transform.xPosition) <15) (thisComp.layer("Пусто 1").transform.xPosition) else (thisComp.layer("Пусто 1").transform.xPosition)-(Math.round((thisComp.layer("Пусто 1").transform.xPosition)/15-0.5))*15

  Konstantin Kartashov replied 9 years, 10 months ago 2 Members · 4 Replies
• 4 Replies

• 

  Dan Ebberts

  July 9, 2016 at 3:29 pm

  Like this maybe:

  
x = thisComp.layer("Пусто 1").transform.xPosition;
if (x < 0)
15 + x%15
else
x%15


  Dan
• 

  Konstantin Kartashov

  July 10, 2016 at 10:34 am

  Thank you very much, Dan,
  Everything`s works as needed. Could you please explain what “%” symbol means here?
• 

  Dan Ebberts

  July 10, 2016 at 1:54 pm

  That’s the JavaScript modulus operator, which returns just the remainder from a division operation. So the result of
  35 % 15 would be 5, for example.

  Dan
• 

  Konstantin Kartashov

  July 10, 2016 at 3:19 pm

  cool! thank you again!

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