• Adobe After Effects Expressions

  How to make curved motion using my existing expression?

  Posted by Darryl Torke on February 28, 2014 at 3:10 am

  Hi, I have a very simple expression that uses the ‘easeIn’ expression, and it looks essentially like this:

  A=[0,500];
  B=[2000,500];
  easeIn(time,0,2,A,B);

  As you can see, the motion moves in a line from point A to point B, however it moves straight. I was wondering if there was a way to make the movement *curved*? (something like this: https://img.tfd.com/mgh/Investopedia/Yield_Curve.png is what I had in mind). And ideally, if there is anyway I could adjust this curve slightly if I have to.

  A=[0,500];
B=[2000,500];
easeIn(time,0,2,A,B);

  Darby Edelen replied 12 years, 2 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Darby Edelen

  February 28, 2014 at 5:14 am

  Is there some reason you can’t simply use keyframe animation?

  Darby Edelen
• 

  Darryl Torke

  February 28, 2014 at 7:32 pm

  Yes, sorry, the example is just a loose understanding. I use constantly changing variables, and each time I apply the layer the origin point and end point change (however the end point is always diagonal from the origin point). The full code is below:

  L = thisComp.layer("Origin");
G1 = L.toWorld(L.anchorPoint,inPoint);
G2 = L.toWorld(L.anchorPoint,inPoint) + [2000, 500];
easeIn(time,inPoint,outPoint,G1,G2);
• 

  Darby Edelen

  February 28, 2014 at 9:50 pm

  Use another “template” layer’s motion path between 0 and 1 seconds to define the path the layer should follow.

  
origin = effect("Origin")("Layer");
template = effect("Motion Template")("Layer");

  start = origin.toWorld(origin.anchorPoint,inPoint);

  t = linear(time,inPoint,outPoint,0,1);

  a = template.toWorld(template.anchorPoint, 0);
  b = template.toWorld(template.anchorPoint, t);

  start + b - a;


  You’ll also notice that I’m pointing to a couple of Effect > Expression Control > Layer Controls on the layer instead of to the layers directly. This allows you to easily apply different Origin/Template layers to each layer.

  Darby Edelen

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