[Jaan Koppe]

Thanks for the code Dan!

The breaking part works very good, until the brake will be “released”, then the wheel rotation value goes back to the car’s position value.

I think, that now I need to track the car’s position to get the current x value and apply that when the checkbox is unchecked?

I added a few lines to the code, got no error’s but also no result:

need to use some other approach I think 🙂

tx = comp("Main").layer("Truck").transform.position;
n2 = tx.nearestKey(time).index;
if (time < tx.key(n2).time) n2--;
t2 = tx.key(n2).time;

cb = comp("Main").layer("CarControl").effect("Break On")("Checkbox");
if (cb.value == 0){
tx.valueAtTime(t2)[0];
}else{
n = cb.nearestKey(time).index;
if (time < cb.key(n).time) n--;
t = cb.key(n).time;
comp("Main").layer("Truck").transform.position.valueAtTime(t)[0];
}

[Jaan Koppe]

This is the first tyre Rotation expression:

if (comp("Main").layer("CarControl").effect("Break On")("Checkbox") == 0)
comp("Main").layer("Truck").transform.position[0]
else
0

[Jaan Koppe]

Thanks for the Reply Dan!

For now I have an animation like this:

https://reels.creativecow.net/film/car-wheel-rotation-test

Both wheel rotations are driven by the Car’s x value.
And when the “Brake On” Checkbox is checked, then the First Wheel rotation value is simply 0.

So i am trying to give the first wheel a constant rotation value which is the current value of rotation. And when the “Brake On” is unchecked, then the Wheel Rotation follow’s the car position x again.

Jaan