• Adobe After Effects Expressions

  Random position and rotation keyframes, with motion in between them

  Posted by Finlay Downes on June 20, 2016 at 1:20 am

  Hi!

  I’m trying to set up a composition with a bunch of objects which will be positioned and rotated randomly. These objects will start motionless and be motionless most of the time, but certain times I want to have them all quickly change their position and rotation to a new random value, tweening between the old value and the new value, with easing a little bit of wiggle and bounce. The objects will then hold that position until the next time I choose to make a keyframe.

  I’ve tried setting this up with wiggle expressions and nulls, but I can’t quite get it to work. Any suggestions?

  Joe Clay replied 10 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Joe Clay

  June 22, 2016 at 3:04 pm

  Something like this? I’m not sure what you’re going for. But maybe this will help. You can tie the wiggle expression to some sliders (under Effect > Expression Controls). It’s not exactly easy to add bounce as well without some extra coding to merge the different expressions together (although I think there’s a script for merging expressions on aescripts). Anyway, this still looks like it bounces if you overshoot the end of the rotation you keyframe. I hope this helps. If not, send more information on what exactly it is you’re trying to do. Often, “why” is a good question to answer as well because it opens up the possibility for other solutions that you’re not thinking of when figuring out “how.” 🙂

  Here’s an example.
  https://www.dropbox.com/s/rdwruh81macs15x/ControlledWiggle.aep?dl=0

  Joe Clay
  Workbench.tv

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