Wiggle with ease

[Dan Ebberts]

Aharon,

What exactly are you trying to do? I mean wiggle() pretty much eases from one value to the next already, right? You must have something specific in mind.

Dan

[Filip Vandueren]

Hey Aharon,

I guess you mean by ‘easing’ that as each wiggled value is reached, the velocity of change drops down to 0.
You can’t do that via wiggle, but you can write your own wiggle-system, interpolating between random values.

this is a hack of one of Dan’s old expressions that does that trick:


tMin = .25; //minimum segment duration
tMax = .5; //maximum segment duration
minVal = [-50,-50];
maxVal = [50,50];
start=0;
end = 0;
j = 0;
while (time >= end){
j ++;
seedRandom(j,true);
start = end;
end += random(tMin,tMax);
}
endVal = random(minVal,maxVal);
seedRandom(j-1,true);
dummy = random(); //this is a throw-away value
startVal = random(minVal,maxVal);
wig = ease(time,start,end,startVal,endVal);

wig+value;


[Aharon Rabinowitz]

Wow – For some reason I never got a a notification for this.

Thanks. I play around.

Best,

Aharon

Aharon Rabinowitz
Email: arabinowitz (AT) yahoo (DOT) com
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[Richard Jones]

There’s actually a much easier way to achieve this. I ended up searching for the answer myself, but realized there’s a SIMPLE way to do this. And like me, I’m sure you’ll feel really stupid when I tell you how to do it. 🙂

Just create a null object, add a Slider Control Effect from the Expression Controls, and link the middle wiggle value to that slider. Then just keyframe the amount of movement you want with the Slider Control and adjust your keyframes from there. Depending on your naming of the layers, the wiggle code will looks something like this:

wiggle(2,thisComp.layer(“Null 1”).effect(“Slider Control”)(“Slider”),1)

[Patrick Brady]

I know this thread hasn’t been touched in awhile, but it was the first one that came up when I searched for this very problem, so I thought I’d share my solution in case more people are looking for the same thing. I think this is along the lines of what Mr. Rabinowitz was looking for; an expression to make a simple wiggle hit 0 velocity between each move:

freq=1; //frequency: fill in or tie to a slider
amp=300; //amplitude: fill in or tie to a slider
octaves=1; //default value
amp_mult=0.5; //default value
period=1/freq; //time taken for each wiggle move
pCount=Math.floor(time/period); //number of wiggles performed so far
sTime=pCount*period; //time when current wiggle begins
eTime=pCount*period+period; //time when current wiggle ends
p1=wiggle(freq, amp, octaves, amp_mult, sTime); //start position of current wiggle
p2=wiggle(freq, amp, octaves, amp_mult, eTime); //end position of current wiggle
ease(time, sTime, eTime, p1, p2); //ease the wiggle