• Adobe After Effects Expressions

  The opacity of a layer trigger by the position of another layer

  Posted by Christophe Zidler on November 21, 2020 at 6:36 pm

  Hi Everybody,

  I’m terrible at expression, and I really need your help.

  I’m looking for an expression that can trigger the opacity of “layer A” based on the position of “layer B”. Basically when B is on top of A he will be at 100% opacity when he will be a bit further opacity will be less. To make kind of a fall of.

  I’m not gonna lie, I know very small of expression, most of the time I’m looking expressions on internet that I copy and adapt. But this time I really can’t find anything about that.

  Thank you for you help.

  

  Christophe Zidler replied 5 years, 10 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  November 21, 2020 at 10:53 pm

  something like this maybe:

  L = thisComp.layer("target");
  falloff = 200;
  d = length(toComp(anchorPoint),L.toComp(L.anchorPoint));
  linear(d,0,falloff,100,0)
• 

  Christophe Zidler

  November 22, 2020 at 10:07 am

  Hi Dan !

  Thanks you so much 🙂

  It works perfectly !!

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