• Adobe After Effects Expressions

  trails with position variables

  Posted by Christine Edwards on March 14, 2011 at 4:38 pm

  I have a white ellipse that enters screen left and exits screen right (basic animation here:https://www.youtube.com/watch?v=jUIgcULk9n8)

  I’ve plugged this script into the position expression:
  strt = 0; //start time of template motion
  end = 4.0; //end time of template motion

  t = thisComp.layer(“template”);
  offset = (t.effect(“offset”)(“Slider”)/100)*(index -1);
  travel = linear(t.effect(“travel”)(“Slider”)/100,strt,end);
  t.position.valueAtTime(travel – offset)

  I got this script from:https://www.motionscript.com/mastering-expressions/follow-the-leader.html
  under “Follow the Null”

  this script is working well, but I want to add follow the nulls z rotation and also make a “spread” slider so that I can spread my white ellipses so that they aren’t all in one train line.

  sorry if this is a FAQ but I can’t find my exact situation and I’m not good with expressions to design or modify!

  strt = 0; //start time of template motion
end = 4.0; //end time of template motion

  t = thisComp.layer("template");
offset = (t.effect("offset")("Slider")/100)*(index -1);
travel = linear(t.effect("travel")("Slider")/100,strt,end);
t.position.valueAtTime(travel - offset)


  Dan Ebberts

  

  replied 15 years, 1 month ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  March 14, 2011 at 7:55 pm

  You can adapt the expression to z rotation like this:

  
strt = 0; //start time of template motion
end = 4.0; //end time of template motion

  t = thisComp.layer("template");
offset = (t.effect("offset")("Slider")/100)*(index -1);
travel = linear(t.effect("travel")("Slider")/100,strt,end);
t.transform.zRotation.valueAtTime(travel - offset)


  I’m not sure what you mean by “spread”. Can you be more specific?

  Dan

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