• Adobe After Effects Expressions

  layer in & out points expressions

  Posted by Tzur Livne on December 16, 2010 at 8:26 am

  hi
  im using an expression to drive a linear wipe effect based on the layer’s In point.
  i want to add an expression to reverse the effect based on the layer’s Out point.
  i can’t manage to find the right way to do it.
  i’m posting the In point expression.
  thanks,
  tzur

  In=thisLayer.inPoint;

  if (time>=In){
ease(time-In,100,0)
}else{
100
}

  Tzur Livne

  David Cabestany replied 10 years, 4 months ago 3 Members · 8 Replies
• 8 Replies

• 

  Dan Ebberts

  December 16, 2010 at 3:01 pm

  Like this maybe:

  if (time < (inPoint+outPoint)/2)
  ease(time-inPoint,0,1,100,0)
  else
  ease(outPoint-time,0,1,100,0)

  Dan
• 

  Tzur Livne

  December 19, 2010 at 1:05 pm

  thanks dan.

  Tzur Livne
• 

  David Cabestany

  April 14, 2016 at 4:42 pm

  What are the 0 and 1 and this expression?

  Best,
  D.
• 

  Dan Ebberts

  April 14, 2016 at 4:58 pm

  Time (in seconds) from the in or out point, which delineate the time span of the ease.

  Dan
• 

  David Cabestany

  April 14, 2016 at 11:52 pm

  Thanks Dan.
• 

  David Cabestany

  April 27, 2016 at 4:21 pm

  Using Tzur’s expression that only animates a fade in without worrying about the out point of the layer, is there a way to make the fade in faster or slower? I’m not clear on what’s controlling the speed of the fade in with the expression as it is right now.

  I tried using Dan’s expression without the second part, but right after the timeline passes the half of the layers duration then the value jumps automatically to almost nothing (.2%)

  Best,
  D.

  In=thisLayer.inPoint;

  if (time>=In){
ease(time-In,100,0)
}else{
100
}
• 

  Dan Ebberts

  April 27, 2016 at 4:31 pm

  Something like this should work:

  fadeDur = 1.5;
  ease(time,inPoint,inPoint+fadeDur,0,100)

  Dan
• 

  David Cabestany

  April 28, 2016 at 7:51 pm

  Thanks a lot Dan.
  Best,
  D.

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