• Adobe After Effects Expressions

  Trigger Animation by Position

  Posted by Andy Wölfl on October 13, 2018 at 1:09 pm

  Hello everybody,

  first of all, I wasn’t really sure how to put the title so here is a video and afterwards the explanation what I want to achieve:
  https://youtu.be/gKhN1CBId2A

  

  I would like the Shape-Layer “particle” start to animate from it’s current yPosition towards a predefined yPosition as soon as the “threshold” rises and pases the “particle”.

  I have a basic knowledge of Expressions and tried some things so far, but did not achieve what I have in mind.

  Any suggestions are welcome.

  In case you want to download the AfterEffects file (CC2018), here is the link:
  https://www.dropbox.com/s/qk7l0lz0r0ocon3/ExpressionTrigger.aep?dl=0

  Thanks for your help.

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  Andy Wölfl replied 7 years, 7 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Gonçalo Silva

  October 13, 2018 at 4:46 pm

  Try this ,

  Paste this on “particle” -> Transform -> X Position :

  Hope this will help

  t = time;
if(thisComp.layer("threshold").transform.yPosition.valueAtTime(t) < transform.yPosition.valueAtTime(t)){
loopOut('cycle');
}
else {
key(1);
}
• 

  Gonçalo Silva

  October 13, 2018 at 6:14 pm

  Here it is the corrected one :

  t = time;

  if(thisComp.layer("threshold").transform.yPosition.valueAtTime(t) < transform.yPosition.valueAtTime(t)){
easeIn(time,inPoint+5,inPoint+9,transform.yPosition.value,500);
}
else {
transform.yPosition;
}
• 

  Andy Wölfl

  October 13, 2018 at 6:22 pm

  Here a video how I should look like:
  https://youtu.be/O1NRQh32-XI

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