• Adobe After Effects Expressions

  Arm Rotate with Sleeve Rotate Delayed

  Posted by Ginger O’toole on June 1, 2020 at 1:17 am

  Hi.
  I have been trying to create an arm rotation expression where;
  as the arm appears to hit the sleeve in either direction, the sleeve only then begins to rotate with it.
  I have 2 layers ARM and SLEEVE – the arm rotating left hits the sleeve at +9 and going right hits the sleeve at -13.
  So I needed an expression for the SLEEVE layer to say “begin rotating with the ARM layer beyond +9 and beyond -13 (minus the difference so the sleeve doesn’t jump) and in between those values, to keep its rotation at zero.

  I was using all kinds of if/else combinations and was getting nowhere, it would only work on one side at a time, but I got this purely by accident as I am only learning the expressions and can’t fully explain how its working and hope it’s a good code… but somebody else might find it useful.

  var r = thisComp.layer(“ARM”).transform.rotation;

  if(r>9){
  thisComp.layer(“ARM”).transform.rotation-9;
  }else{
  0;
  };
  if(r<-13){ thisComp.layer("ARM").transform.rotation+13; };

  Ginger O’toole replied 6 years, 2 months ago 1 Member · 0 Replies
• 0 Replies

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