坐标转换

来源：互联网发布：灰度共生矩阵编辑：程序博客网时间：2024/06/10 08:56

／／2D转3D

public static string curHitTag;

  public static Vector3 pointTo3d(Vector2 position,Camera mcamera,string layerName){

        LayerMask mask = 1 << LayerMask.NameToLayer(layerName);

        Ray ray = mcamera.ScreenPointToRay(new Vector3 (position.x,position.y,0));
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit,800,mask)){

            curHitTag = hit.transform.tag;

            return hit.point;
        }

        curHitTag = null;

        return Vector3.zero;
    }

／／注：LayerMask实际上是用Int32的32个位来表示每个层级，当这个位为1时表示使用这个层，为0时表示不用这个层

／／3D转2D

  public static Vector3 pointTo2d(Vector3 piont){
        //GameObject mainCamera = GameObject.Find("Main Camera");
        Camera camera = Camera.main;
        Vector3    screenPiont = camera.WorldToScreenPoint(piont);
        Vector3    viewportPiont = camera.WorldToViewportPoint(piont);

        //Debug.Log(" screenPiont "+ screenPiont +" viewportPiont"+ viewportPiont);

        GameObject  canvas =  GameObject.Find("Canvas");
        CanvasScaler canvasScaler = canvas.GetComponent<CanvasScaler>();
        float width  =  canvas.GetComponent<RectTransform>().rect.width;
        float height =  canvas.GetComponent<RectTransform>().rect.height;

        float wb = width / Screen.width  ;
        float hb = height / Screen.height  ;

        return new Vector3( screenPiont.x * wb - width * 0.5f,screenPiont.y * hb - height * 0.5f,0);
    }

／／屏幕中心

public static Vector3 get2DpiontScreenCenter(){
return new Vector3(Screen.width * .5f, Screen.height * .5f, 0);
}

／／屏幕中心地面坐标
    public static Vector3 get3DpiontScreenCenter(){
        GameObject mainCamera = GameObject.Find("Main Camera");
        Camera camera = mainCamera.GetComponent<Camera> ();
        Ray ray1 = camera.ScreenPointToRay (new Vector3 (Screen.width * .5f, Screen.height * .5f, 0));
        RaycastHit hit1;
        if (Physics.Raycast (ray1, out hit1)) {
            return hit1.point;
        }

        return new Vector3();
    }

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