unity常用API（四）

个人英语不好，所以看的是2018.1 的中文API 部分代码和解释都来源于此文档：原文链接

视频链接：点击链接

Physics

Raycast ：向场景中的所有碰撞体投射一条射线，该射线起点为 /origin/，朝向 /direction/，长度为 /maxDistance/。

     // 接受一个射线
     Ray ray = new Ray(transform.position+transform.forward,transform.forward);
     bool isCollider = Physics.Raycast(ray);
     Debug.Log(isCollider);
     void Update()
     {
         Ray ray = new Ray(transform.position+transform.forward,transform.forward);
         //bool isCollider = Physics.Raycast(ray);
         // 射线的距离
         //bool isCollider = Physics.Raycast(ray, 1);
         RaycastHit hit; 
         //bool isCollider = Physics.Raycast(ray, out hit);
         //Debug.Log(hit.point);  // 获取捕获的点
         //Debug.Log(hit.collider);   // 碰撞的游戏物体
         //
         // 碰撞 layer 为xx的层 
         // bool isCollider = Physics.Raycast(ray, Mathf.Infinity,LayerMask.GetMask("xx")); 
     }
     //2D
     Physics2D.Raycast();

UGUI 事件监听

```c#
    public GameObject btnGameObject;    // 按钮
    public GameObject sliderGameObject; // 滑动
    public GameObject dropDownGameObject;    //下拉
    public GameObject toggleGameObject;    // 勾选

    // Use this for initialization
    void Start () {
        btnGameObject.GetComponent<Button>().onClick.AddListener(this.ButtonOnClick);
        sliderGameObject.GetComponent<Slider>().onValueChanged.AddListener(this.OnSliderChanged);
        dropDownGameObject.GetComponent<Dropdown>().onValueChanged.AddListener(this.OnDropDownChanged);
        toggleGameObject.GetComponent<Toggle>().onValueChanged.AddListener(this.OnToggleChanged);
    }

    void ButtonOnClick()
    {
        Debug.Log("ButtonOnClick");
    }
    void OnSliderChanged(float value)
    {
        Debug.Log("SliderChanged:" + value);
    }
    void OnDropDownChanged(Int32 value)
    {
        Debug.Log("DropDownChanged:" + value);
    }
    void OnToggleChanged(bool value)
    {
        Debug.Log("ToggleChanged:" + value);
    }
```

```c#
    // 实现接口 UI,EventSystem
     //interface
    public class UIEventManager2 : MonoBehaviour//, IPointerDownHandler,IPointerClickHandler,IPointerUpHandler,IPointerEnterHandler,IPointerExitHandler
        ,IBeginDragHandler,IDragHandler,IEndDragHandler,IDropHandler
    {
        public void OnBeginDrag(PointerEventData eventData)
        {
            Debug.Log("OnBeginDrag");
        }

        public void OnDrag(PointerEventData eventData)
        {
            Debug.Log("OnDrag");
        }

        public void OnDrop(PointerEventData eventData)
        {
            Debug.Log("OnDrop");
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            Debug.Log("OnEndDrag");
        }

        public void OnPointerClick(PointerEventData eventData)
        {
            Debug.Log("OnPointerClick");
        }

        public void OnPointerDown(PointerEventData eventData)
        {
            Debug.Log("OnPointerDown");
        }

        public void OnPointerEnter(PointerEventData eventData)
        {
            Debug.Log("OnPointerEnter");
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            Debug.Log("OnPointerExit");
        }

        public void OnPointerUp(PointerEventData eventData)
        {
            Debug.Log("OnPointerUp");
        }
    }

```

其他

Camera
ScreenPointToRay : 返回从摄像机通过屏幕点的光线。

 private Camera camera;
 // Use this for initialization
 void Start () {
     camera = Camera.main;
 }
 // Update is called once per frame
 void Update () {
     Ray ray = camera.ScreenPointToRay(Input.mousePosition);
     //Debug.DrawRay(ray.origin, ray.direction);
     //Debug.DrawLine(ray.origin, ray.origin + ray.direction * 100);
     RaycastHit hit;
     bool isCollider = Physics.Raycast(ray, out hit);
     Debug.Log(hit.collider);
 }

CharacterController : 可使您轻松进行受碰撞约束的移动，同时不必处理刚体。

     public float speed = 3;
     private CharacterController cc;
     // Use this for initialization
     void Start () {
         cc = GetComponent<CharacterController>(); 
     }
     // Update is called once per frame
     void Update () {
         float h = Input.GetAxis("Horizontal");
         float v = Input.GetAxis("Vertical");
         cc.SimpleMove(new Vector3(h, 0, v) * speed);
         //cc.Move(new Vector3(h, 0, v) * speed * Time.deltaTime);
         Debug.Log(cc.isGrounded);
     }
     private void OnControllerColliderHit(ControllerColliderHit hit) // 检测碰撞
     {
         Debug.Log(hit.collider);
     }

Mesh : 材质

     public Mesh mesh;
     private Material mat;
     // Use this for initialization
     void Start () {
         //GetComponent<MeshFilter>().sharedMesh = mesh;
         //Debug.Log(GetComponent<MeshFilter>().mesh == mesh);
         mat = GetComponent<MeshRenderer>().material;      // 获取材质       
     }        
     // Update is called once per frame
     void Update () {
         mat.color = Color.Lerp(mat.color, Color.red, Time.deltaTime); // 更新颜色
     }