Conditionally offsetting a value

[Kevin Camp]

i’m not sure if this will work for your set up, but in a simple situation with a layer moving from offscreen-right to offscreen-left this would make it repeat:
loopOut()

Kevin Camp
Art Director
KCPQ, KZJO & KRCW

[Jovan Mikonjic]

Thanks Kevin,

But this situation is more complex because value will vary depending on an external controller.

[Jovan Mikonjic]

I got this working, but it will only move the layer to the opposite side once,
while input for the movement comes from a rotation value of another layer that will turn multiple circles… maybe theres a solution here..

I am actually animating an panoramic projection, this is why I am trying to have left and right sides of the comp ‘meet’.

X=position[0];
Y=position[1];
if (X < thisComp.width-thisComp.width)
{
[X+thisComp.width,Y];
}
else if (X >thisComp.width)
{
[X-thisComp.width,Y];}
else
[X,Y]

[Dan Ebberts]

It’s hard to picture how you have things set up exactly, but if there’s a relationship between the layer’s position and the other layer’s rotation, you can reduce the rotation to a value between 0 and 360 by doing something like this:

r = thisComp.layer(“other layer”).rotation%360;

Dan

[Jovan Mikonjic]

Dear Dan,

thanks for the tip,
I will report if it does the trick.

Maybe you can also help me with understanding how to approach this problem:

I have set up an expression that will forward the position of a layer
from one side of the comp to the other, if the layer position value is smaller or greater than the comp width.

But the problem comes when it travels like this multiple times
The expression is not self aware,
it is returning a new value to the layer position.
And this new value is not affected by the expression again and again.

In this case:

when the expression does its thing – the layer position goes from 0 to 3072, that is the right end of the comp

If the layer would then go again to the left end of the comp, so the new value is -3072 (value in yellow)
and the value affected by the expression is 0 (value in red)

The expression will not work on the red value.

How could I overcome this limit of the expression?

My best idea is to have the if clause for every instance
0, -3072, -6144.. and so on?

Is it possible to have it address the ‘red value’ in some way?

Thank you!!

X=position[0];
Y=position[1];
if (X <= 0)
{
[X+thisComp.width,Y];
}
else if (X >= 3072)
{
[X-thisComp.width,Y];}
else
[X,Y]

[Kevin Camp]

I don’t see how rotation of another layer is being used in your expression (it looks like it is evaluating keyframed values), but you may be able to loop the position output in a similar way to how Dan proposed looping a rotation input.

try something like this for the position:

x = value[0]%thisComp.width;
[x,value[1]]

it’s impossible to test it out on my end since i don’t have the whole picture of how you have things set up.

Kevin Camp
Art Director
KCPQ, KZJO & KRCW