Atan2 is giving the false angle when object's y or z change in Unity

Question

I wrote a algorithm. Its normally working. Just i can not get right angle of x when y or z changes

float x = Mathf.Atan2(transform.forward.y, transform.forward.z) * Mathf.Rad2Deg

This code is giving the right angle when my object angles are (x,0,0). But when the y or z change(x,35,46), this code is giving false angle. By the way i want to get 0-360 angle. If i get this angle, code will work(i tested it). So i am trying to get the rotation of x axis 0-360. But the atan2 is not giving the right value. Maybe i can use Vector3.Angle but it doesn't work that i want. I don't ask too many questions in stackoverflow so if you didn't understand please tell me which part didn't you get it?

Answer 1

If I understand you correct you want the objects rotation around the X axis (global or local).

You could probably simply use Transform.eulerAngles something like

var x = transform.eulerAngles.x;
if(x < 0) angle += 360;

Or if you want the local rotation (relative to the parent) Transform.localEulerAngles

var x = transform.localEulerAngles.x;
if(x < 0) angle += 360;

Answer 2

No, I wouldn't figured out

int sign = (transform.forward.y<0) ? 1 : -1;
float x = (Vector3.Angle(transform.position, transform.forward) - 38) * sign * 180 / 100;

This code is just working on 0,90,0 angle I still can not reach the right angle when the rotation change I found some code with the combination of Cross,Dot,Angle:

float Angle360(Vector3 v1, Vector3 v2, Vector3 n)
{
   float angle = Vector3.Angle(v1,v2);
                        
   float sign = Mathf.Sign(Vector3.Dot(n, Vector3.Cross(v1, v2)));
   float signed_angle = angle * sign;
                    
   return (signed_angle + 180) % 360;
}

This code is not working too It will be made probably with Vector3.Angle or Dot vs. How can i find right angle with Vector3.Angle, The value 38 is changing

Vector3.Angle(transform.position, transform.forward)

This code is showing the angle but when the rotation change it gives false value. how can i get the angle of x when objects look change. So this code is giving right when the value is x,0,0.

Mathf.Atan2(transform.forward.y, transform.forward.z) * Mathf.Rad2Deg

I think i am not using Vector3.Angle Correctly I need to get the x value when the y and z values are different