• Adobe After Effects Expressions

  Rotation On Off from other layer position

  Posted by Madli Man on December 19, 2012 at 3:58 am

  hi all,

  i very new to expression. i found this expression and i would like to put in y rotation.
  how can i modify it to stay to last value once it hit zero.

  if layer(“Avoid Me”) is far away, value y rotation is 100. if result 0, rotation is 0 and never affected with layer(“Avoid Me”) anymore.

  please help me sir.

  thank you.

  D_opaq =10
D_trans = 150;
d = length(position, thisComp.layer("Avoid Me").transform.position);
result = ease(d, D_opaq, D_trans, 100, 0);
[result]
if(result==0){
[0]
}

  Madli Man replied 13 years, 4 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Madli Man

  December 19, 2012 at 4:35 pm

  anyone help me?
• 

  Dan Ebberts

  December 19, 2012 at 5:28 pm

  It’s a little tricky. You have to go back in time, frame-by-frame to see if the layers were ever close enough together to force the output to zero (I used a threshold of .5 pixels in this example–you may need to adjust it). So I think it would be like this (I had to flip the 0 and 100 values in your ease() statement to get it to work as you described):

  
D_opaq =10;
D_trans = 150;
D_threshold = .5;

  f0 = timeToFrames(inPoint);
for (f = timeToFrames(time); f >= f0; f--){
t = framesToTime(f);
d = length(position.valueAtTime(t), thisComp.layer("Avoid Me").transform.position.valueAtTime(t));
trigger = d < D_threshold;
if (trigger) break;
}
if (! trigger){
d = length(position, thisComp.layer("Avoid Me").transform.position);
ease(d, D_opaq, D_trans, 0, 100);
}else
0


  Dan
• 

  Madli Man

  December 19, 2012 at 5:40 pm

  Thank you Mr.Dan, this help me alot. it works. it just i need to be careful with pixel if match with threshold. I dont really know how it works, but im trying to get the logic now. 🙂

  Thank you sir. God bless you.

  Madlim

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