How can I prevent the camera from leaning left and right?

Questions & Answers
1

So I’m trying to create a basic Total War styled camera. So far I can move it…

left, right - forward, backward - rotate left and right - tilt up and down

Basically, the issue I’m having is this… Screenshot by Lightshot
I want to prevent it from turning sideways like that. How can I accomplish that? Here’s the code so far.

public float moveSpeed;
public float tiltSpeed;
public float minimumHeight;
public float rotateSpeed;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

transform.Translate (Vector3.right * Input.GetAxis ("Horizontal") * moveSpeed * Time.deltaTime);

transform.Translate (Vector3.forward * Input.GetAxis ("Vertical") * moveSpeed * Time.deltaTime);

transform.Rotate (Vector3.right * Input.GetAxis ("Tilt") * tiltSpeed * Time.deltaTime);

    transform.Rotate(Vector3.up * Input.GetAxis("Rotate") * rotateSpeed * Time.deltaTime);

    if (transform.position.y < minimumHeight)

		transform.Translate(0, minimumHeight - transform.position.y, 0);
	
	}
2

Just change Rotate() to RotateAround() for you “Rotate” axis:
transform.RotateAround(transform.position,Vector3.up,Input.GetAxis ("Rotate") * rotateSpeed * Time.deltaTime);