• Adobe After Effects

  Falling Piece of Paper Effect

  Posted by Tyler Yowell on April 18, 2007 at 7:25 pm

  Is there a way to give the impression of a comp. falling back and forth, like a leaf or a piece of paper, until it hits the ground?

  Thanks!

  Sam Rae replied 7 years, 2 months ago 4 Members · 4 Replies
• 4 Replies

• 

  Tyler Yowell

  April 18, 2007 at 10:15 pm

  I mean something that I have precomped.
• 

  Mike Clasby

  April 19, 2007 at 2:14 am

  Posted by Dan Ebberts on June 18 2003

  A falling leaf can be a pretty complicated simulation – sometimes they just
  fall gently, sometimes they do barrel-rolls, sometimes glide back and forth, or
  any combination. These expression roughly simulate the glide back and forth
  variation. I tried this on a 3D solid positioned above the camera view,
  oriented with Z pointing down and Y pointing in the positive Z direction
  (orientation [90,0,0]).

  Then I added these three expressions:

  POSITION:

  yVelocity = 200; //pixels per second
  oscFreq = 1.5; //oscillations per second
  oscDepth = 35; //oscillation depth (pixels)
  drift = 25; // drift (wind?) (pixels per second: – = left, + = right)

  value + [oscDepth*Math.sin(oscFreq*Math.PI*2*time) + drift *time,
  yVelocity*time,0]

  Z ROTATION:

  seed_random(index,true);
  random(360);

  Y ROTATION:

  oscFreq = 1.5;
  maxTilt = 15; //degrees

  maxTilt*Math.cos(oscFreq*Math.PI*2*time)

  If you edit the parameters, you need to make sure that the oscillating
  frequency is the same in both the position and y-rotation expressions (or map
  it to a slider control). If you wanted to apply this to a bunch of leaves,
  you’d want to introduce some randomness into the various parameters along with
  a random starting phase.
• 

  I.g. Romov

  February 17, 2019 at 1:50 am

  Lotta stuff on the Inet but every now and then you come across an oldie but a goodies and this is one of those. Thanks Dan!
• 

  Sam Rae

  February 19, 2019 at 9:24 pm

  Ideed, this sounds like a pretty cool effect! I forgot until now, but I wanted to do similar but with money lol

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