Unity3D实现摄像机视野的拉远拉近和跟随主角旋转效果

在Unity官网教程SurvivalShooter（恶魔射手）中，只处理了主角跟随鼠标旋转，摄像机视野并没有旋转或通过滚轮实现视野的拉远拉近，一下是我的实现方法。

  在教程中，主角的移动是通过

    //void Move(float h, float v)

    //{

    //    movement.Set(h, 0f, v);

    //    movement = movement.normalized * speed * Time.deltaTime;

    //    playerRgidBody.MovePosition(transform.position + movement);

    //    PlayAnimation(h, v);

    //    PlayerTurning(h, v);

    //}

实现的，他只能实现世界坐标系中x轴方向和z轴方向的移动（我的理解），以下是玩家的代码：

void FixedUpdate()

    {

        float h = Input.GetAxisRaw("Horizontal");

        float v = Input.GetAxisRaw("Vertical");

        //Move(h, v);

        if (Input.GetKey(KeyCode.W))

        {

            MoveForward();

        }

        if (Input.GetKey(KeyCode.S))

        {

            MoveBack();

        } if (Input.GetKey(KeyCode.A))

        {

            MoveLeft();

        }

        if (Input.GetKey(KeyCode.D))

        {

            MoveRight();

        }

        PlayAnimation(h, v);

        PlayerTurning(h, v);

    }

    void MoveForward()

    {

        transform.Translate(Vector3.forward * Time.deltaTime * speed);

    }

    void MoveBack()

    {

        transform.Translate(Vector3.forward * Time.deltaTime * -speed);

    }

    void MoveLeft()

    {

        transform.Translate(Vector3.left * Time.deltaTime * speed);

    }

    void MoveRight()

    {

        transform.Translate(Vector3.left * Time.deltaTime * -speed);

    }

    void PlayAnimation(float h, float v)

    {

        bool IsWalking = h != 0 || v != 0;

        anim.SetBool("IsWalking", IsWalking);

    }

    void PlayerTurning(float h, float v)//人物跟随鼠标旋转

    {

        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, camRayLength, floorMask))

        {

            Vector3 playerToMouse = hit.point - transform.position;

            playerToMouse.y = 0f;

            Quaternion newRotation = Quaternion.LookRotation(playerToMouse);

            playerRgidBody.MoveRotation(newRotation);

        }

    }

以下是摄像机的代码：

    void Start()

    {

        offset = transform.position - target.position;

    }

    void Update()

    {

        Vector3 currentPosition = target.position + offset;

        transform.position = Vector3.Lerp(transform.position,

            currentPosition, smoothing * Time.deltaTime);

        RotateView();

        ScrooView();

    }

    void ScrooView()//处理视野的拉近和拉远效果

    {

        Distance = offset.magnitude;

        Distance += -Input.GetAxis("Mouse ScrollWheel") * scrollSpeed;

        Distance = Mathf.Clamp(Distance, 5, 23);

        offset = offset.normalized * Distance;

    }

    void RotateView()//处理视野的选转

    {

        if (Input.GetMouseButtonDown(1))

        {

            isRotating = true;

        }

        if (Input.GetMouseButtonUp(1))

        {

            isRotating = false;

        }

        if (isRotating)

        {

            Vector3 originalPosition = transform.position;

            Quaternion originalRotation = transform.rotation;

 

            transform.RotateAround(target.position, target.up, Input.GetAxis("Mouse X") * rotateSpeed);

            transform.RotateAround(target.position, transform.right, -Input.GetAxis("Mouse Y") * rotateSpeed);

 

            float x = transform.eulerAngles.x;

            if (x < 10 || x > 80)//防止前后旋转角度过大

            {

                transform.position = originalPosition;

                transform.rotation = originalRotation;

            }

            offset = transform.position - target.position;

        }

    }

通过此方法，即可实现旋转视野、摄像机跟随主角移动和旋转。

如有错误，欢饮指正。