[Unity third-person free perspective] Third-person full free perspective

        Share a third-person movement with a completely free perspective. The effect is as follows:

first step:

        Create a character and a camera. The character will be equipped with a movement script, and the camera will be equipped with a perspective control script:

Step two:

        Write a movement script to drag the camera into cameraTrans:

public class PlayerMove : MonoBehaviour
{
    private CharacterController _player;
    //移动
    public float moveSpeed;
    private float _horizontal, _vertical;
    private Vector3 _direction;
    public Transform cameraTrans;
    public float turnSmoothTime = 0.1f;
    private float _turnSmoothVelocity;

    private void Awake()
    {
        _player = GetComponent<CharacterController>();
    }

    private void Update()
    {
        MoveByKey();
    }

    private void MoveByKey()
    {   
        //获取按键
        _horizontal = Input.GetAxis("Horizontal");
        _vertical = Input.GetAxis("Vertical");
        _direction = new Vector3(_horizontal, 0f, _vertical);
        if (_direction.magnitude >= 0.1f)
        {
            float targetangle = Mathf.Atan2(_direction.x, _direction.z) * Mathf.Rad2Deg + cameraTrans.eulerAngles.y;
            float angle = Mathf.SmoothDampAngle(transform.eulerAngles.y, targetangle, ref _turnSmoothVelocity, turnSmoothTime);
            transform.rotation = Quaternion.Euler(0f, angle, 0f);
            Vector3 moveDir = Quaternion.Euler(0f, targetangle, 0f) * Vector3.forward;
            Vector3 moveDir1 = moveDir * moveSpeed * Time.deltaTime;
            _player.Move(moveDir1);
        }
    }
}

third step:

        Write a camera movement script and press the right mouse button to rotate the perspective:

public class CameraControl : MonoBehaviour
{
    public Transform player;    //相机追随目标
    public float xSpeed = 200;  //X轴方向拖动速度
    public float ySpeed = 200;  //Y轴方向拖动速度
    public float mSpeed = 10;   //放大缩小速度
    public float yMinLimit = -50; //在Y轴最小移动范围
    public float yMaxLimit = 50; //在Y轴最大移动范围
    public float distance = 10;  //相机视角距离
    public float minDinstance = 2; //相机视角最小距离
    public float maxDinstance = 30; //相机视角最大距离
    public float x = 0.0f;
    public float y = 0.0f;
    void Start()
    {
        Vector3 angle = transform.eulerAngles;
        x = angle.y;
        y = angle.x;
    }

    void LateUpdate()
    {
        if (player)
        {
            if (Input.GetMouseButton(1))
            {
                x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
                y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
                y = ClamAngle(y, yMinLimit, yMaxLimit);

            }
            distance -= Input.GetAxis("Mouse ScrollWheel") * mSpeed;
            distance = Mathf.Clamp(distance, minDinstance, maxDinstance);
            Quaternion rotation = Quaternion.Euler(y, x, 0.0f);
            Vector3 disVector = new Vector3(0.0f, 0.0f, -distance);
            Vector3 position = rotation * disVector + player.position;
            transform.rotation = rotation;
            transform.position = position;
        }
    }
    /// <summary>
    /// 限制某一轴移动范围
    /// </summary>
    /// <param name = "angle" ></ param >
    /// < param name="min"></param>
    /// <param name = "max" ></ param >
    /// < returns ></ returns >
    static float ClamAngle(float angle, float min, float max)
    {
        if (angle < -360)
        {
            angle += 360;
        }
        if (angle > 360)
        {
            angle -= 360;
        }
        return Mathf.Clamp(angle, min, max);
    }
}

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