• Adobe After Effects Expressions

  Exponential Jitter/Wiggle Expression Over Time?

  Posted by Max Jackson on October 26, 2012 at 12:07 am

  Hi CC,

  I’m not new to coding but am I new to expressions and was wondering what the expression was to exponentially increase jitter/wiggle over time?

  I have this but it’s not very smooth. It’s rather lumpy:

  timeToStart = 5;
    if (time > timeToStart){
        wiggle(5000,time*2);
    }else{
        value;
    }

  Also is there a good resource page for this?

  Thanks a bunch for any suggestions.

  Stephane Audrier replied 13 years, 4 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  October 26, 2012 at 12:25 am

  I assume you’re talking about changing the wiggle frequency. If so, I’d recommend you check this out and come back if you still have questions:

  https://www.motionscript.com/articles/speed-control.html#wiggle

  Dan
• 

  Max Jackson

  October 26, 2012 at 12:34 am

  Hi Dan,

  Yes, this is what I was roaming the web for. I’m trying to make my wiggle motion wave more uniform and exponential, less wobbly really, more shaky like an earthquake growing. This is looks like a great doc to reference.

  Thanks!
• 

  Stephane Audrier

  January 8, 2013 at 3:41 pm

  Hi!

  Dan, I’ve used your linear keyframe integrator to the time parameter to animate the frequency of the wiggle at rotation parameter of my cg rocks (videocopilot Element 3D assets), it works fine… But my rocks look like they don’t have mass or any weight when they wiggle.
  How can i put “inertia” into the wiggle expression to fake the mass/weight of the rocks and make it more realistic ?

  Thanks for your help.
  Stephane.

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