Preventing Z rotation change

I took some code from a platformer tutorial series for an orbiting camera.

The camera rotates a pivot object, and moves based on that rotation and an offset vector.

Code (CSharp):

1. // Get the X position of the mouse & rotate the pivot
2. horizontalRotation = Input.GetAxis("Mouse X") * horizontalSensitivity;
3. pivot.Rotate(0, horizontalRotation, 0);
4.  
5. // Get the Y position of the mouse & rotate the pivot
6. verticalRotation = Input.GetAxis("Mouse Y") * verticalSensitivity;
7. pivot.Rotate(-verticalRotation, 0, 0);
8.  
9. float desiredXAngle = pivot.eulerAngles.x;
10. float desiredYAngle = pivot.eulerAngles.y;
11.  
12. Quaternion rotation = Quaternion.Euler(desiredXAngle, desiredYAngle, 0);
13. transform.position = target.position + (rotation * offset);
14.  
15. transform.LookAt(target);

When I move the camera around, the Z rotation of the pivot is being changed. I know this is happening because of eulers, but I don't remember how to fix it.

Looked around the internet, but found nothing so far. I've had this problem a lot in the past, and most of the time I fixed it, but I either didn't document it, or have long since deleted the files.

 

Hello,
It's your LookAt, I'd say. Try to use transform.rotation = rotation instead?

 

It's not, the camera is fine in terms of rotation, it's the pivot object's Z that changes, causing the camera movement to act weird after some time rotating.