• Adobe After Effects Expressions

  flicker 3d light expression

  Posted by Paul Nevison on May 24, 2007 at 12:36 pm

  hey i want to randomise the intensity of a light in my comp. can someone suggest an expression to do this..wiggle perhaps.

  new to expressions so sorry to ask something that is probably really basic.

  thanks

  G5 DP 2.0 (Power PC)
  4.0G RAM
  OS 10.4.8
  QT 7.1.3
  FCP 5.1.2
  BMD Decklink Extreme 6.0
  PAL Land

  Selwyn Storer replied 16 years, 1 month ago 3 Members · 4 Replies
• 4 Replies

• 

  Lord Scales

  May 24, 2007 at 2:23 pm

  Try this, written by Dan Ebberts:

  segMin = 1.0; //minimum segment duration
  segMax = 1.5; //maximum segment duration
  flickerDurMin = .5;
  flickerDurMax = .8;

  end = 0;
  j = 0;
  while ( time >= end){
  j += 1;
  seedRandom(j,true);
  start = end;
  end += random(segMin,segMax);
  }
  flickerDur = random(flickerDurMin,flickerDurMax);
  if (time > end – flickerDur){
  seedRandom(1,false);
  random(100);
  }else{
  100
  }
• 

  Paul Nevison

  May 24, 2007 at 6:59 pm

  thanks for that

  do i cut and paste after alt clicking the stopwatch for the intensity property?

  G5 DP 2.0 (Power PC)
  4.0G RAM
  OS 10.4.8
  QT 7.1.3
  FCP 5.1.2
  BMD Decklink Extreme 6.0
  PAL Land
• 

  Lord Scales

  May 24, 2007 at 7:20 pm

  Yes
• 

  Selwyn Storer

  March 19, 2010 at 8:49 am

  What do i need to change in this expression to make the light intensity to flicker like candle light?
  Thank you

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