• Adobe After Effects Expressions

  Keyframing Parenting

  Posted by Francois Germain on March 13, 2015 at 8:54 pm

  Hi guys. I’ve look if it was possible to keyframe parenting. Actually, it doesn’t need to be a real parenting link beetween 2 objects. Just act like it. In fact I just need a position link. So I made that expression but there’s a glitch. It triggers parenting but when I turn it off, the child gets back to it’s original position.

  So here’s how it works:
  the child layer has a checkbox expression control.
  the expression is in the transform.position

  i guess the solution is in the last 2 lines, but I can’t find it.

  thanks

  newPos=transform.position;

  objetA=thisComp.layer("Master");
  objetB=thisLayer;

  if (objetB.effect("Checkbox Control")("Checkbox")==true) {

  if (objetA.transform.position[0]>objetB.transform.position[0])
  { Xsign=-1}
  else
  {Xsign=1}
  if (objetA.transform.position[1]>objetB.transform.position[1])
  { Ysign=-1}
  else
  {Ysign=1}

  t1=objetB.effect("Checkbox Control")("Checkbox").key(2).time;
  lockOn=valueAtTime(t1);

  distX=length(objetA.transform.position.valueAtTime(t1)[0],objetB.transform.position.valueAtTime(t1)[1]);
  distY=length(objetA.transform.position.valueAtTime(t1)[1],objetB.transform.position.valueAtTime(t1)[1]);

  newPosX=objetA.transform.position[0]+(distX*Xsign);
  newPosY=objetA.transform.position[1]+(distY*Ysign);
  newPos=[newPosX,newPosY];
  newPos

  }else{
  if (time<=0){
  newPos=transform.position}
  else{

  PositionPause=objetB.transform.position.valueAtTime(time);
newPos=PositionPause;}
}


  Francois Germain replied 11 years, 1 month ago 1 Member · 0 Replies
• 0 Replies

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