Velocity-based rotation?

[Kevin Camp]

yep… pretty much any key framed property will have velocity or speed, so an expression like this could be used to link one layer’s velocity to another’s rotation:

L = thisComp.layer(“square”); // this is your square layer, or layer to take velocity from
L.transform.position.velocity[0]/50;

the expression looks only at x position, to look at y, change [0] to [1]; or z, change to [2].

the 50 can be changed to any value to get the amount of rotation you need, 50 was kind of arbitrary on my end

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Dan Ebberts]

I think this is what you’re asking for, but I doubt that it’s really what you want:

factor = 50;
vx = -thisComp.layer(“leader”).transform.position.velocity[0];
vx/factor

My guess is that you’re really looking for a more complex simulation that is based on acceleration, inertia, and overshoot.

Dan

[Navarro Parker]

That works amazingly well. But you’re right, I would like to soften out the rotation a bit. Would adding overshoot and dampening be overly complicated?

(If this was Cinema 4D, I’d just throw on a Delay effector!)