• Adobe After Effects Expressions

  Expression to make objects to move out at random from source object in center of screen

  Posted by David Mathis on December 12, 2013 at 3:04 pm

  Looking to create an expression that would make a circles go out in different directions from a circle in the middle of the screen. I saw a video on something similar to this one time but can not remember the expression that was used. I do remember, however, that a wiggle expression was involved.

  Also, what books are recommended for learning expressions? Some stuff I understand other stuff keeps slamming me into a brick wall.

  George Goodman replied 12 years, 7 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Kevin Camp

  December 12, 2013 at 6:26 pm

  try this:

  target = thisComp.layer('center layer'); // your center circle layer
area = [800,800]; // value in pixels
dur = 3; // value in seconds

  seedRandom(index,true);
p1 = target.position;
p2 = random(p1-area,p1+area)
linear(time-inPoint, 0, dur, p1, p2)

  Kevin Camp
  Senior Designer
  KCPQ, KMYQ & KRCW
• 

  George Goodman

  December 13, 2013 at 4:58 am

  If your circle is a shape layer, you could just use wiggle transform. All you would need to do is duplicate it a bunch of times and add the wiggle transformer to the bottom of all the shapes. Take wiggles per second to 0 and then keyframe the position under it’s transform from 0,0 to 3049,4256 … or whatever last value works in getting them all off screen.

  “|_ (°_0) _|”

  Sincerely,

  George

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