Get none absolute angle between quaternions

Unity Engine
1

Hi!
I am trying to create a parallax style effect for a rotating object. So I’m trying to calculate the angle between the previous rotation (before the update call) and the current rotation (in update) of a specific axis so that I can then rotate all the other objects accordingly (at a faster or slower pace than the current object). However I am running into trouble doing that.

I am able to get the absolute angle using Quaternion.Angle(), but it always gives me a positive number instead of giving me the actual angle with direction. I also tried eularAngles but that always brings up a positive number as well.

Is there a simple way to know the angle of rotation of an object on a specific axis (with the number sign)? For example, if I rotate my object on the Y axis from 10 degrees to 90 degrees, I will calculate that it rotated 80 degrees. If I rotate it from 60 degrees to 20 degrees, I will calculate that it rotated -40 degrees. Of course I want to get all this information from the object itself from a variable that I store before and after the update call.

My goal is to use this number to for a transform.Rotate(x,y,z) call.

Thanks for reading.
Yaniv

Sorry but I found my answer at unity answers. I can’t delete so I’m posting this for others to see in the future:

2

If I’m not mistaken, for this you will need to calculate right vector, which points to the right side on the plane of rotation, and direction vector, which points in the direction of an angle you’re calculating (probably quaternionRotation * Vector.forward), and then do something like this:

if (Vector3.Dot(right, direction) < 0.0f) {
	angle = 360.0f - angle;
}