• Adobe After Effects Expressions

  Random position start from specific position

  Posted by Nikolay Vladimirov on December 13, 2015 at 10:49 pm

  Hi I’m trying to get some object start to move random from one figure with this expression added to position:
  segMin = .3; //minimum segment duration
  segMax = .7; //maximum segment duration
  minVal = [0.1*thisComp.width, 0.1*thisComp.height];
  maxVal = [0.9*thisComp.width, 0.9*thisComp.height];

  seedRandom(index,true);
  segDur = random(segMin, segMax);
  seed = Math.floor(time/segDur);
  segStart = seed*segDur;
  seedRandom(seed,true);
  startVal = random(minVal,maxVal);
  seedRandom(seed+1,true);
  endVal = random(minVal,maxVal);
  ease(time,segStart,segStart + segDur, startVal, endVal);

  But the problem is when I add the expression the object position on the first frame now is in random position – can i get it to start from specific position?

  Dan Ebberts replied 10 years, 8 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  December 13, 2015 at 11:56 pm

  Try this one:

  
minDur = .3;
maxDur = .7;
vMin = [0.1*thisComp.width, 0.1*thisComp.height];
vMax = [0.9*thisComp.width, 0.9*thisComp.height];
seedRandom(index,true);
tNext = tPrev = inPoint;
n = 0;
while (tNext <= time){
tPrev = tNext;
tNext += random(minDur,maxDur);
n++;
}
seedRandom(tPrev,true);
vPrev = (n == 1) ? value : random(vMin,vMax);
seedRandom(tNext,true);
vNext = random(vMin,vMax);
ease(time,tPrev,tNext,vPrev,vNext);


  Dan

Reply to this Discussion! Login or Sign Up