• Adobe After Effects Expressions

  Random Lines – movement from a certain point

  Posted by Katherine Landgrebe on November 18, 2009 at 5:08 pm

  Hi,

  I’m working with Dan’s Random Lines Expression.
  Now I tried to set a certain starting point, which works fine when I set the startVal = value[0], but there is a jump to the next frame. How can I make the line move without a jump?

  if (time<=3) {
value
}

  else {
  tMin = .5; //minimum segment duration
  tMax = 6; //maximum segment duration

  end = 0;
j = 0;
while (time >= end){
j++;
seedRandom(j,true);
start = end;
end += random(tMin,tMax);
}
endVal = random(thisComp.width);
seedRandom(j - 1,true);
x = random(); //this is a throw-away value
startVal = value[0];
x = ease(time,start,end,startVal,endVal);
[x,value[1]]
}

  Katherine Landgrebe replied 16 years, 8 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  November 18, 2009 at 7:05 pm

  Try this:

  beginTime = 3;

  if (time<=beginTime) { value }else { t = time - beginTime; tMin = .5; //minimum segment duration tMax = 6; //maximum segment duration end = 0; j = 0; while (t >= end){
  j++;
  seedRandom(j,true);
  start = end;
  end += random(tMin,tMax);
  }
  endVal = random(thisComp.width);
  seedRandom(j – 1,true);
  x = random(); //this is a throw-away value
  if (j > 1){
  startVal = random()*this_comp.width;
  }else{
  startVal = value[0];
  }
  x = ease(t,start,end,startVal,endVal);
  [x,value[1]]
  }

  Dan
• 

  Katherine Landgrebe

  November 18, 2009 at 7:37 pm

  Perfect!!!
  Thank you so much. You saved my day 🙂 *curtsy*

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