• Adobe After Effects

  anchored lines

  Posted by Dustin Ward on October 7, 2009 at 11:20 pm

  I’m trying to attach only one end of a line to a null that is tracked to some footage. I can get the line to follow the null, but I am trying to get one end to stay stationary while the other follows the tracker information.

  Curious Turtle replied 16 years, 9 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Curious Turtle

  October 8, 2009 at 5:12 am

  There’s a number of different ways to do this and here’s a couple:

  i) Use a Beam effect, and set one end to your static point. Then use an expression and pickwhip the Null’s position to the second point.

  ii) Use a lovely “Point At” expression on a line shape. Apply this to the rotation of you line layer:

  from=transform.position;
to=thisComp.layer("YOUR LAYER").transform.position;
delta=sub(from,to);
angle=Math.atan2(delta[1],delta[0]);
radiansToDegrees(angle)+180;

  Just change the layer name in line 2 to your Null layer’s name.

  All the best,
  Ben

  Curious Turtle Pro Video
  Training | Editing | Support
  Out Now – Film Wash Color Effects Vol. 3
  for After Effects & Apple Color
  & Mocha training for AE & FCP

Reply to this Discussion! Login or Sign Up