• Adobe After Effects Expressions

  Null linking

  Posted by Jeff Mcbride on August 20, 2007 at 6:18 pm

  How could I set up two nulls so that Null A is a center point and Null B cannot go farther than a predetermined distance from A?

  Dan Ebberts replied 18 years, 9 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  August 20, 2007 at 6:34 pm

  Try this:

  maxDist = 200;

  p = thisComp.layer(“Null A”).transform.position;
  v = transform.position – p;
  if (length(v) > maxDist){
  p + normalize(v)*maxDist
  }else{
  value
  }

  This assumes neither null has a parent.

  Dan

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