CameraController

using UnityEngine;
using System.Collections;

public class Camera3 : MonoBehaviour {

    // Se Ti interessano i commenti leggili, senno cancellali o ignorali a tua discrezione

    public Transform target;            // the transform of the target which the camera should look

    public float turnSpeed = 4f;        // how fast the camera moves from inputs
    public float height = 3f;           // basically camera's highness respect it's target
    public float distance = 3f;         // the back position of the camera respect the target
    public bool is3rdPerson = true;     // check state if the player is using a 3rd person setting

    private Vector3 offset;     // the initial offset of the camera respect it's target
    private float y = 0f;       // the y input from the mouse is stored here
    private float z = 0f;       // the z input from the mouse is stored here

    void Start () {
        offset = new Vector3(0, height, -distance); // - distance is for placing the initial camera behind the target instead in front of it
    }


    void Update () {
        // 3rd person cam setting handler
        if (is3rdPerson)
        {
            y = Input.GetAxis("Mouse Y") * turnSpeed;
            z = Input.GetAxis("Mouse X") * turnSpeed;

            // Quaternion.AngleAxis just creates rotation of the angles of the first parameter on the axis indicated by the second parameter
            // Vector3.Up is just a shorthand for new Vector3(0,1,0)
            offset = Quaternion.AngleAxis(z, Vector3.up) * offset;
            offset = Quaternion.AngleAxis(y, Vector3.right) * offset;

            // updates the camera position according to the rotation obtained by mouse inputs
            transform.position= target.position + offset;
            // while moving the camera will look at the transform of the target(the player)
            transform.LookAt(target.position);
        }

    }
}