• Adobe After Effects Expressions

  Position from two layers, plannar positioning

  Posted by Tim Harris on January 25, 2017 at 3:31 am

  I found a Fusion expression that I would like to know how to implement in Ae if possible.
  It requires two point that can then be used interpolate a 3rd point that is adjustable.
  It would be very useful for tracking.
  The Fusion expression and example can be found here;
  https://www.youtube.com/watch?v=kyaTJmmOmQ8

  Thanks kindly.

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  Tim Harris replied 9 years, 3 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  January 25, 2017 at 6:32 pm

  I’m not sure how you want to implement this in AE, but it might be as simple as an expression like this:

  s = effect(“Slider Control”)(“Slider”);
  a = thisComp.layer(“A”).transform.position;
  b = thisComp.layer(“B”).transform.position;
  linear(s,0,100,a,b)

  Dan
• 

  Emre Anil

  January 25, 2017 at 8:01 pm

  Setup:
  

  P3 layer has Slider Control renamed to “weight” and adjusted value to 0 to 1

  Expressions for copy-paste:

  Weight Text – Source Text:
  
w = Math.round(thisComp.layer("P3").effect("weight")("Slider") * 100) / 100;
"w=" + w;


  Weight Text – Position (used anchor point for positioning):
  
thisComp.layer("P3").transform.position


  P3 (3rd Point) – Position:
  
w = effect("weight")("Slider");
p1 = thisComp.layer("P1").transform.position;
p2 = thisComp.layer("P2").transform.position;
x = ((1 - w) * p1[0]) + (w * p2[0]);
y = ((1 - w) * p1[1]) + (w * p2[1]);
[x, y];


  Beam Effect – Starting Point:
  
thisComp.layer("P1").transform.position


  Beam Effect – End Point:
  
thisComp.layer("P2").transform.position

• 

  Tim Harris

  January 26, 2017 at 9:01 am

  Emre Anil,

  Thank you so much for taking the time to post your solution, which works perfectly :-).
  This will be very useful.

  Kind Regards,

  Tim

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