• Adobe After Effects Expressions

  link a layers Y position to another layers y scale

  Posted by Conor Mclaughlin on November 9, 2018 at 2:41 pm

  I’m trying to link a layers Y position to another layers y scale. Is their an expression I can use?

  Here is my project: https://imgur.com/a/fbjc08o

  As the pink walls scale up, I want the green cube top to follow.

  Thanks

  View post on imgur.com

  Conor Mclaughlin replied 7 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Scott Mcgee

  November 12, 2018 at 12:41 pm

  If you want the green top layer to move on the y position.

  Someone might have a better expression to link something to the edge. But this is the idea you want.

  x = value[0]
  y = thisComp.layer(index+1).position[1] – thisComp.layer(index+1).sourceRectAtTime().height;
  [x,y]

  Making sure you anchorPoint is attached the bottom of the pink layer the is scaling up. This will position it to the top part of the shapeLayer.

  If you are using the scale[1]. You’ll need it to calculate the percentage

  x = value[0]
  y = thisComp.layer(index+1).position[1] – (thisComp.layer(index+1).sourceRectAtTime().height * thisComp.layer(index+1).scale[1]/100);
  [x,y]

  I’m sure someone else will have a tidier expression that works better, but this should do the trick for you if your anchorPoints are set up correctly

  Hope that helps.
• 

  Conor Mclaughlin

  November 14, 2018 at 12:46 pm

  Thanks!

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