• Adobe After Effects Expressions

  How to change the position of an object with easy movment with expresions

  Posted by Marcelo Cabral on September 6, 2011 at 5:47 pm

  Hi.
  I need to change the 2D layer position with easy movments. In other word I have a simple square in the scene and I need to move out of the scene but with a easy movment using marks in the layer

  I found this expression to “see” the layer mark
  but what can I add to this expression to control the object to move it out of the scene with easy movment.

  Thanks

  n = 0;
t = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time) n--;
}
if (n > 0) t = time - marker.key(n).time;

  Marcelo Cabral replied 14 years, 8 months ago 2 Members · 12 Replies
• 12 Replies

• 

  Dan Ebberts

  September 6, 2011 at 6:22 pm

  What direction do you want it to go?

  DAn
• 

  Marcelo Cabral

  September 6, 2011 at 6:33 pm

  from the center to the left
• 

  Marcelo Cabral

  September 6, 2011 at 6:42 pm

  Hi Dan
  I need to move the object from the center to the left out of the escene.
  Thanks
• 

  Dan Ebberts

  September 6, 2011 at 8:14 pm

  Play around with this (tweak the rate variable):

  
rate = [-5000,0];
v = value;
if (marker.numKeys >0){
t = time - marker.key(1).time;
if (t > 0)
v = valueAtTime(t) + rate*t*t;
}
v


  Dan
• 

  Marcelo Cabral

  September 6, 2011 at 8:53 pm

  Amazin!! thanks Dan this works really good.
• 

  Marcelo Cabral

  September 6, 2011 at 9:27 pm

  Thanks Dan I really appreciate your help. I have just one more question. How to modify this expression to bring a layer from out to the center of the escene.

  Thanks in advance

  Marcelo
• 

  Marcelo Cabral

  September 6, 2011 at 9:32 pm

  Is there some way to make this expression work with two marks? the first mark to get in the layer to the escene and a sedond mark to get it out off the escene. I will appreciate your help Dan.

  Thanks
• 

  Dan Ebberts

  September 7, 2011 at 3:07 pm

  This should bring an offscreen layer to the center at the first marker and send it back where it came from at the second marker:

  
center = [thisComp.width,thisComp.height]/2;
dur = .1;

  v = value;
if (marker.numKeys > 1 && time > marker.key(2).time){
t = time - marker.key(2).time;
v = easeOut(t,0,dur,center,value);
}else if (marker.numKeys > 0 && time > marker.key(1).time){
t = time - marker.key(1).time;
v = easeIn(t,0,dur,value,center);
}
v


  Dan
• 

  Marcelo Cabral

  September 7, 2011 at 4:19 pm

  Hi Dan
  this errors appers when I aply the expression in the position property of a simple 2d solid.

  AFTER EFFECTS WARNING
  Function Array is undefined
  Expression disabled.

  Erros occurred at line 10.
  Comp: “solid test”
  Layer:1 (“Red Solid 3”)
  Property: “position”
• 

  Marcelo Cabral

  September 7, 2011 at 4:34 pm

  Hi Dan
  I fix the problem but I need to make a deceleration (like a EASY EASE when it come to the center. How can I make it?

  Thank for your time Dan

  Best regards

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