• Adobe After Effects Expressions

  Delaying Parented Rotation

  Posted by Corey Branigan on October 27, 2017 at 9:17 pm

  Hi all! I’m trying to wrack my brain around this:
  I want a character’s hat to have an inertial bounce that follows the head such as:
  Head rotates 5 degrees. 2 frames later, the hat rotates 5 degrees, giving the illusion of physical drag.

  I’ve tried modifying Inertia Bounce and Afterease expressions, but these use Key data, not parented/expressed data. I’ve also read the motionscript.com page: Creating Trails, with no practical re-application. I’ve gotten to apply a delay to rotation, but just barely. I’ve even tried to link World Data with nulls to no avail.

  If you have any insight on how to make this work, please let me know, thank you!

  Darryl Ashe replied 6 years, 4 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Demarc Johnson

  November 8, 2017 at 7:12 pm

  You can use the valueAtTime method to do a delay in the hat’s rotation. The valueAtTime method offsets a property’s value by time.

  var delay = thisComp.frameDuration * 2; //This will delay the frame by 2, but you can change it to whatever number you want
thisComp.layer("Head").transform.rotation.valueAtTime(time - delay); //Pick whip the head's rotation and add the valueAtTime method, then subtract time with the delay variable in the parenthesis.

  For Expression Tutorials:
  https://www.youtube.com/channel/UCe77szX2n1WSKsGs-2gmbDw
• 

  Darryl Ashe

  January 8, 2020 at 5:13 pm

  Hey man

  Thanks for this – I have this applied to some hair behind the head, so as the head rorates the hair is slightly behind. Is there a way to add any easing to the expression? to make the childs rotation smooth in and out.

  Thanks

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