Getting rotation value between two position values

[Dan Ebberts]

Assuming that you’re talking about 2D, this may be close to what you’re looking for:

L1 = thisComp.layer(“Layer 1”);
L2 = thisComp.layer(“Layer 2”);
p1 = L1.toWorld(L1.anchorPoint);
p2 = L2.toWorld(L2.anchorPoint);
delta = p2 – p1;
radiansToDegrees(Math.atan2(delta[1],delta[0]));

Dan

[Fud Hodgkinson]

Hi there! WOuld you have any idea of how to get this expression to work for 3D space between two 3d nulls?

I did a screencap of my problem here:
https://youtu.be/jRHFRCFB2v8

The position works perfectly however I can’t get the rotational value between two 3d nulls.

Thanks!

Some contents or functionalities here are not available due to your cookie preferences!

This happens because the functionality/content marked as “Google Youtube” uses cookies that you choosed to keep disabled. In order to view this content or use this functionality, please enable cookies: click here to open your cookie preferences.

[Gerben Greuliker]

Hi Dan,

 

I’m working on an animation where two wheels of a car move separately on a bumpy road and the chassis has to rotate according the value of these two wheels. Looking at this expression I think this will do the trick. But when I apply the expression I get a syntax error on the ‘delta’. Seeing this expression is from the year 2010 I assume the error has to do with it being written in the ‘old’ action scripting format. Is there a simple update to fix this?

thnx in advance!

 

Gerben Greuliker

[Dan Ebberts]

A lot of the old expressions got mangled when they updated this site. The straight quotes got converted to curly quotes and the minus signs got converted to some other character. This should work better:

L1 = thisComp.layer("Layer 1");
L2 = thisComp.layer("Layer 2");
p1 = L1.toWorld(L1.anchorPoint);
p2 = L2.toWorld(L2.anchorPoint);
delta = p2 - p1;
radiansToDegrees(Math.atan2(delta[1],delta[0]));

[Gerben Greuliker]

Thnx Dan!

I just happen to find this code on another site.
It uses position as the source but works the same.

p1 = thisComp.layer("Start").transform.position;
p2 = thisComp.layer("End").transform.position;
v = p2 - p1;
radiansToDegrees(Math.atan2(v[1], v[0]));