• Adobe After Effects Expressions

  Random expression between 0 and 100, not 0-100.

  Posted by Mikko Kovasiipi on August 9, 2011 at 12:26 pm

  Hello.

  I need to do some camera flashes and I’m using just a regular Lens Flare plug-in for that. Now I would like to do some random expression for the Flare Brightness. I would like the brightness to be either 0 or 100, not between 0-100. And also the interval to be something between 0.5 seconds and 2 seconds. Any ideas for that?

  I have also done one expression for the position of the flare like this:
  holdTime = .5;
  seed = Math.floor(time/holdTime);
  seedRandom(seed,true);
  random([thisComp.width,thisComp.height]);

  But the interval for this is 0.5 seconds and I would like that to be also something between 0.5 and 2 seconds. Not always the same 0.5.

  I would really appreciate if someone could help me with this.

  Thanks.

  Mikko K.

  Dan Ebberts replied 14 years, 9 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  August 9, 2011 at 4:11 pm

  Try this:

  
flashFrames = 2;
minInt = .5;
maxInt = 2;
seedRandom(index,true);
t0 = t1 = -random(maxInt);
while (t1 <= time){
t0 = t1;
t1 += random(minInt,maxInt);
}
time <= (t0 + framesToTime(flashFrames)) ? 100 : 0


  Dan

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