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Navarro Parker
Navarro Parker
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Snappier Wiggle?

Jun 27, 2012 1:06 PM

Tags: #ae #expression #wiggle

How would you make a wiggle expression that radically reduced the time between values?  Like Wiggle that uses Exponential interpolation as inbetween values? So even though the pace would be something like wiggle(1,50), it would take much less than the 1 second wiggle interval to change between values.

 

Kind of like how a hummingbird feeds? It hovers, hovers, hovers... then snap into a new position.... hover, hover, hover... snap into new position.

 

Any ideas about this?

 

(Also, is the Jagged/Smooth option of the ancient Wiggler available in expression form?)

856 Views   4 Replies   Latest reply: Navarro Parker, Jun 28, 2012 2:57 PM
 
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  • Dan Ebberts
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    1. Dan Ebberts,
    Jun 27, 2012 1:55 PM   in reply to Navarro Parker
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    Interesting idea. I think it might be easier to do it this way than to start with wiggle():

     

    minVal = -100;

    maxVal = 100;

    minDuration = 0.5;

    maxDuration = 1.5;

    transRate = 400;

     

    tEnd = 0;

    n = 0;

    seedRandom(n, true);

    preRun = random(maxDuration);

    while (time + preRun >= tEnd){

      n++;

      seedRandom(n, true);

      dur = random(minDuration, maxDuration);

      tEnd += dur;

    }

    t = time + preRun - (tEnd - dur);

     

    n += 9973;

    seedRandom(n, true);

    endVal = random(minVal, maxVal);

    seedRandom(n - 1, true);

    startVal = random(minVal, maxVal);

    delta = endVal-startVal;

    transTime = Math.abs(delta/transRate);

    ease(t, (dur-transTime)/2,(dur+transTime)/2, startVal, endVal);

     

    You can make wiggle() more jagged by increasing the number of octaves (third parameter of wiggle()).

     

    Dan

     
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  • Navarro Parker
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    2. Navarro Parker,
    Jun 27, 2012 2:40 PM   in reply to Dan Ebberts
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    Hi Dan! Wow, you are quick!

     

    I pasted this into my 2D position parameter and got an error:

    "Expression result must be of dimension 2, not 1"

     
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  • Dan Ebberts
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    3. Dan Ebberts,
    Jun 27, 2012 2:52 PM   in reply to Navarro Parker
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    I guess 2D positon would be more like this:

     

    minVal = [0,0];

    maxVal = [thisComp.width,thisComp.height];

    minDuration = 0.5;

    maxDuration = 1.5;

    transRate = 1000;

     

    tEnd = 0;

    n = 0;

    seedRandom(n, true);

    preRun = random(maxDuration);

    while (time + preRun >= tEnd){

      n++;

      seedRandom(n, true);

      dur = random(minDuration, maxDuration);

      tEnd += dur;

    }

    t = time + preRun - (tEnd - dur);

     

    n += 9973;

    seedRandom(n, true);

    endVal = random(minVal, maxVal);

    seedRandom(n - 1, true);

    startVal = random(minVal, maxVal);

    delta = length(endVal,startVal);

    transTime = Math.abs(delta/transRate);

    ease(t, (dur-transTime)/2,(dur+transTime)/2, startVal, endVal);

     

     

    Dan

     
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  • Navarro Parker
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    4. Navarro Parker,
    Jun 28, 2012 2:57 PM   in reply to Dan Ebberts
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    Looks fantastic! Played around with the transRate to tweak — lots of fun.

     

    What do I modify to use like the way wiggle (freq,amp) works?

     
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