Unity中给3D物体添加按钮点击功能

1.将下面该段代码赋给摄像机

void Update ()
{
    RaycastHit hit = new RaycastHit();
    for (int i = 0; i < Input.touchCount; ++i)
    {
        if (Input.GetTouch(i).phase.Equals(TouchPhase.Began))
        {
            // Construct a ray from the current touch coordinates
            Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(i).position);
            if (Physics.Raycast(ray, out hit))
            {
                hit.transform.gameObject.SendMessage("OnMouseDown");
            }
         }
    }
}
  2.为要被点击的3D物体创建一个C#脚本，并   添加OnMouseDown函数，以使上段代码进行触发执行；   

void OnMouseDown()
{
    DoSomething();
}
This script can be attached to any GameObjects that you want to use as buttons.