Wave Delay in Y Position Only

[Dan Ebberts]

I’m not sure what you’re doing, but this might help. This expression should cause a layer to oscillate up and down only, based on its x position in the comp. So it should generate a wave if you have a bunch of layers (with the same pre-expression y value) arranged in a horizontal line.

freq = 1; // one oscillation per second
amplitude = 50; // up and down 50 pixels

P = toWorld(anchorPoint);
phase = (P[0]/thisComp.width)*Math.PI*2;
y = amplitude*Math.sin(time*freq*Math.PI*2 + phase);
value + [0,y]

Dan

[Robert Elliott]

Thanks Dan. That’s a nice effect and might help with another task I need to deal with next. I was looking for more of a follow the leader kind of look where I could keyframe one object and have the others follow. I was able to get closer by searching deeper through the posts and modifying one to get this:

delay = 10; //number of frames to delay

d = delay*thisComp.frameDuration*(index – 1);
[position[0], thisComp.layer(“1”).transform.position.valueAtTime(time – d) [1]]

I’ve got 18 objects. Is there a way to lesson the Y value of each layer so it doesn’t rise above the Y position of its previous layer? Does that make sense?

Thanks,
Rob

[Dan Ebberts]

Probably, but it’s hard to pin down without more information about how you want it to work. Maybe some numeric examples would help.

Dan