• Adobe After Effects Expressions

  Move object between 3 different positions using slider control.

  Posted by Benjamin Taylor-day on July 4, 2013 at 7:20 pm

  Im currently working on an animation which includes having the characters ears go up and down depending on his expressions (happy/ sad etc).

  Ive currently managed to link both ears to a single slider that will move the ears up and down between 2 points: A: [2243.0,324.6] and B [2342.8,582.0], the code im using for this is:

  S=thisComp.layer(“Null 2”).effect(“Slider Control”)(“Slider”);
  A= [2243,324.6];
  B= [2342.8,582];
  linear(S,0,100,A,B)

  However i want to insert a 3rd point so when the slider is at 50 (half way) the ear will be at [2366.9,501.6].

  The code i tried was:

  S=thisComp.layer(“Null 2”).effect(“Slider Control”)(“Slider”);
  A= [2243,324.6];
  B= [2366.9,501.6];
  C= [2342.8,582];
  linear(S,0,100,A,B,C)

  But as i dont really understand what im saying there its not too surprising that the code didnt work.

  Anyhelp at all would be very grateful. Thanks 🙂

  Mike Roberts replied 11 years, 3 months ago 4 Members · 5 Replies
• 5 Replies

• 

  Dan Ebberts

  July 4, 2013 at 8:49 pm

  Try it this way:

  S=thisComp.layer(“Null 2”).effect(“Slider Control”)(“Slider”);
  A= [2243,324.6];
  B= [2366.9,501.6];
  C= [2342.8,582];
  if (S < 50)
  linear(S,0,50,A,B)
  else
  linear(S,50,100,B,C)

  Dan
• 

  Benjamin Taylor-day

  July 4, 2013 at 9:14 pm

  It works!!! Yaaaaaaay!

  Just to get my head around this for future reference…

  Your basically telling AE that when the slider is below 50 then make the scale 0-50 with points A and B at each end. When the slider is above 50 then the scale is 50-100 with points B and C at each end? When you put it that way its really simple!

  Thanks so much 🙂
• 

  Dan Ebberts

  July 4, 2013 at 9:24 pm

  I think you’ve got it.

  Dan
• 

  Mitch Mann

  July 8, 2013 at 1:49 pm

  … Or the poor man’s way:
  Animate it between 3 points in a preComp, then have the slider control the time remap.
• 

  Mike Roberts

  January 28, 2015 at 11:52 pm

  Hey! any idea how to add a fourth variable?

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