鼠标拖动物体

var layerMask = 1 << 4;                  //层

var hit : RaycastHit;                  //光
var hit1: RaycastHit;                  //光
var hitflag : boolean;
var hitobject : Transform;

function Start()
{
    layerMask = ~layerMask;                 //层取反
    hitflag=false;
    hitobject=null;
}

function Update ()
{
    var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
    if (Physics.Raycast (ray, hit, Mathf.Infinity)&&Input.GetKey (KeyCode.Mouse0))
    {
        Debug.DrawLine (ray.origin, hit.point);
        print(hit.transform.localScale );

        if(hit.transform.tag=="Goods")              //标签
        {
            hitflag=true;
            hitobject=hit.transform;
        }

        if (hitflag&&hitobject!=null)              //选中物体
        {
            Physics.Raycast (ray, hit1, Mathf.Infinity,layerMask);       //打光
            hitobject.position=hit1.point;             //物体的坐标等于光2的碰撞点
        }

    }
    if (Input.GetKeyUp (KeyCode.Mouse0))
    {
        hitflag=false;
        hitobject=null;
    }
}