• Adobe After Effects Expressions

  How can I make some random velocity of each object with random position?

  Posted by Byeong Han Kim on July 2, 2022 at 12:12 am

  I try to make some falling objects, I can make random fixed position but I can’t make it move with random speed.

  here is a expression that i try.

  //

  seedRandom(thisComp.layer(“Null 1”).effect(“rotation seed”)(“Slider”),true);

  var v =thisComp.layer(“Null 1”).effect(“spread”)(“Slider”);

  var x=[v,-v];//fixed y postition

  var y=[-v,-v];//fixed y postition

  gaussRandom(x,y)*(-time)*random(1,10)

  //

  actually it move it well but when i add //*(-time)*random(1,10)// this part to move it, position of objects are fixed at one position and then start to falling down.

  can I get some any idea of this? I’m newbie of expression. So I want feedback of that poor expression too. Thanks.

  sorry for my bad Eng ;<

  Filip Vandueren replied 4 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Filip Vandueren

  July 8, 2022 at 9:40 am

  Hi There,

  it happens because you multiply by time, at the beginning time=0, so everything is [0,0].

  You will probably need a random x,y position AND an random x,y velocity.

  or multiply by (-time-1)

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