Unity3D自学笔记——架构应用（八）人物移动与角色相机的跟随

人物移动与角色相机的跟随

人物移动

获取键盘方向输入值，然后再利用Charactor实现人物的移动

1.首先向模型添加CharactorController, 并调整它的大小和中心位置

2.添加PlayerController脚本，控制其移动
在移动前，需要先让角色平缓旋转，添加一个Roating方法

旋转的方向就是角色到键盘输入点的方向，然后利用插值进行平滑旋转，

private void Rotating(float horizontal, float vertical)    {        var targetDirection = new Vector3(-horizontal, 0, -vertical);        var targetRotation = Quaternion.LookRotation(targetDirection, Vector3.up);        transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, this.rotaionSpeed);    }

添加Move方法
因为CharactorController并不使用刚体效果，所以为了使它接触地面，需要在y方向上持续给一个力

private void Move(float horizontal, float vertical)    {        if (Mathf.Abs(horizontal) > 0.5 || Mathf.Abs(vertical) > 0.5)        {            //播放Run动画            this.m_Animator.SetBool("IsRun", true);            Rotating(horizontal, vertical);            Vector3 direct = Vector3.zero;            if (m_Controller.isGrounded)            {                //角色面向的方向，忽略Y轴                direct = new Vector3(transform.forward.x, -1, transform.forward.z);            }            //持续向下的力            direct.y -= 20 * Time.deltaTime;            m_Controller.Move(direct * speed * Time.deltaTime);        }        else        {            //停止Run,进入Idle动画            this.m_Animator.SetBool("IsRun", false);        }    }

然后在Update里调用Move方法
这里horzontal 和Vertical为负，是因为角色坐标系和世界坐标系相反

void Update()    {        Move(-Input.GetAxis("Horizontal"), -Input.GetAxis("Vertical"));    }

自身坐标系

实际坐标系

完整代码

public class PlayerController : MonoBehaviour {    public float rotaionSpeed = 0.5f;    public float speed = 3.6f;    private CharacterController m_Controller;    private Animator m_Animator;    void Start()    {        this.m_Controller = this.GetComponent<CharacterController>();        this.m_Animator = this.GetComponent<Animator>();    }    void Update()    {        Move(-Input.GetAxis("Horizontal"), -Input.GetAxis("Vertical"));    }    private void Move(float horizontal, float vertical)    {        if (Mathf.Abs(horizontal) > 0.5 || Mathf.Abs(vertical) > 0.5)        {            this.m_Animator.SetBool("IsRun", true);            Rotating(horizontal, vertical);            Vector3 direct = Vector3.zero;            if (m_Controller.isGrounded)            {                direct = new Vector3(transform.forward.x, -1, transform.forward.z);            }            direct.y -= 20 * Time.deltaTime;            m_Controller.Move(direct * speed * Time.deltaTime);        }        else        {            this.m_Animator.SetBool("IsRun", false);        }    }    private void Rotating(float horizontal, float vertical)    {        var targetDirection = new Vector3(horizontal, 0, vertical);        var targetRotation = Quaternion.LookRotation(targetDirection, Vector3.up);        transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, this.rotaionSpeed);    }}

角色相机的跟随

角色相机初始位置，与X平面成45度夹角，因为坐标系和世界坐标系相反，所以与Y平面成180度，即相反方向

相机和目标保持相对位置，且与目标在X平面的角度不会改变，一直保持45度，但是能通过鼠标滚轮，对相机进行接近或远离，就是调整相机的Posion.z。

相机初始化
获取绑定的目标

  void Start () {        if(target == null)        {            target = GameObject.FindGameObjectWithTag("Player");            if(target == null)            {                Debug.LogWarning("Don't found player tag please change player tag to Player");              }        }        //当前距离为缩放的最大距离        distance = zoomMax;        //用于平滑移动相机        distanceLerp = distance;        //移动到指定位置        MoveCamera();    }

相机的移动

void MoveCamera()    {        //相机当前的Rotation        Quaternion rotation = Quaternion.Euler(transform.eulerAngles.x, transform.eulerAngles.y, 0);        //当前与目标位置的距离        Vector3 calPos = new Vector3(0, 0, -distanceLerp);        //相机的应该移动到的位置        position = rotation * calPos + target.transform.position;        transform.rotation = rotation;        transform.position = position;    }

rotation * calPos 就是让calPos旋转rotation角度，即到达红线位置

相机缩放
调整distance,即上图蓝线的长度

void ScrollMouse()    {        distanceLerp = Mathf.Lerp(distanceLerp,distance,Time.deltaTime * 5);        if (Input.GetAxis("Mouse ScrollWheel") != 0)             {                    distance = Vector3.Distance (transform.position , target.transform.position);                    distance = ScrollLimit(distance - Input.GetAxis("Mouse ScrollWheel")*scrollSpeed, zoomMin, zoomMax);             }    }

完整代码

public class FollowTargetCamera : MonoBehaviour {    [HideInInspector]    public GameObject target;     public float scrollSpeed;     public float zoomMin;     public float zoomMax;    private float distance;    private float distanceLerp;    private Vector3 position;     void Start () {        if(target == null)        {            target = GameObject.FindGameObjectWithTag("Player");            if(target == null)            {                Debug.LogWarning("Don't found player tag please change player tag to Player");              }        }        distance = zoomMax;        distanceLerp = distance;        MoveCamera();    }    //角色移动放在Update方法里，在角色移动后处理    void LateUpdate () {        ScrollMouse();        MoveCamera();    }    void MoveCamera()    {        Quaternion rotation = Quaternion.Euler(transform.eulerAngles.x, transform.eulerAngles.y, 0);        Vector3 calPos = new Vector3(0, 0, -distanceLerp);        position = rotation * calPos + target.transform.position;        transform.rotation = rotation;        transform.position = position;    }    //鼠标滚动后重新计算镜头和目标的距离    void ScrollMouse()    {        distanceLerp = Mathf.Lerp(distanceLerp,distance,Time.deltaTime * 5);        if (Input.GetAxis("Mouse ScrollWheel") != 0)             {                    distance = Vector3.Distance (transform.position , target.transform.position);                    distance = ScrollLimit(distance - Input.GetAxis("Mouse ScrollWheel")*scrollSpeed, zoomMin, zoomMax);             }    }    //滚动距离大小限制    float ScrollLimit(float dist, float min, float max)    {        if (dist < min)             dist= min;         if (dist > max)             dist= max;          return dist;    }