adding decay to Dan’s random lines script

[Dan Ebberts]

I’m not sure what you mean by decay. Do you want the lines to slow down and stop at random positions, return to their original positions, or something else entirely?

Dan

[Gary Nicholson]

Hi Dan

Slowing the lines down to a stop is the effect I’m after.

Thx

Gary

[Dan Ebberts]

I was afraid of that. 🙂

Something like this might work:

decayStart = 4;
decaySpeed = 4;
segMin = .3; //minimum segment duration
segMax = .7; //maximum segment duration
minVal = 0;
maxVal = thisComp.width;

end = 0;
j = 0;
if (time > decayStart){
  delta = time - decayStart;
  factor = 1 + delta*delta*decaySpeed;
}else{
 factor = 1;
}
while ( time >= end){
  j += 1;
  seedRandom(j,true);
  start = end;
  end += random(segMin,segMax)*factor;
}
endVal =  random(minVal,maxVal);
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
startVal =  random(minVal,maxVal);
y = position[1];
ease(time,start,end,[startVal,y],[endVal,y])

Dan

[Gary Nicholson]

Hi Dan

Just what I needed, thanks for your help and time.

Gary