display layer movement direction

[Dan Ebberts]

Try this:

v = toCompVec(position.velocity);
if (v[0] < 0) “Left” else “Right”

You may want to add a third option for when it’s not moving left or right.

Dan

[Alex Weil]

thanks Dan,

maybe you can help me with a similar expression? i’ll post it underneath. i have a layer parented to a second layer. when the “master” layer moves left, the “slave” layer rotates with a positive value, when it moves left, it should rotate to a negative value. at the moment i have an if/else driven checkbox expression. maybe there is a way to somehow combine the expressions?

(i hope my english is good enough to make my case clear).

if (effect("Checkbox Control")("Checkbox")== 1){
r= -1 ;
}else{
r= 1 ;
}

x=thisComp.layer("Shape Layer 1").transform.position;
(x.speed/30)*r

[Dan Ebberts]

Something like this maybe:

v = parent.toCompVec(parent.position.velocity);
r = (v[0] < 0) ? -1 : 1;
(parent.position.speed/30)*r

You might have to reverse the -1 and 1, if I got it backwards.

Dan

[Alex Weil]

brilliant as always, Mr. Ebberts ☺ thanks so much