1， 物体旋转

void Update () {

transform.Rotate (new Vector3 (0, 1, 0),400);
//transform.Rotate (new Vector3 (0, 1, 0));

//transform.RotateAround (new Vector3 (0, 0, 0)/*旋转的中心*/, new Vector3 (0, 1, 0), 2/*角度*/);
		
	}

3， 屏幕单击的射线

using UnityEngine;
using System.Collections;

public class Rays : MonoBehaviour {

	private RaycastHit objhit;
	private Ray _ray;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

		if (Input.GetMouseButtonDown(0)) {
			_ray = Camera.main.ScreenPointToRay (Input.mousePosition);
			if (Physics.Raycast(_ray, out objhit, 100)) {
				GameObject gm = objhit.collider.gameObject;
//				Debug.Log ("_rayhit");
//				Debug.Log (gm);
				gm.GetComponent<MeshRenderer>().material.color = Color.green;


			}
		}
	
	}
}

3 运行时单击某个物体，出现按钮，单击按钮物体变为设置的颜色。

using UnityEngine;
using System.Collections;

public class Rays : MonoBehaviour {

	private RaycastHit objhit;
	private Ray _ray;
	public GameObject colorPanle;


	// Use this for initialization
	void Start () {
		colorPanle.SetActive (false);//画布是否激活可见
	
	}
	
	// Update is called once per frame
	void Update () {

		if (Input.GetMouseButtonDown(0)) {
			_ray = Camera.main.ScreenPointToRay (Input.mousePosition);
			//射线从相机发出，经过屏幕上鼠标点击的位置
			Debug.DrawLine (_ray.origin, objhit.point, Color.blue, 2);
			//画出这条射线
			if (Physics.Raycast(_ray, out objhit, 100)) {
				//从射线出发最远100m的范围内
//				GameObject gm = objhit.collider.gameObject;
//				Debug.Log ("_rayhit");
//				Debug.Log (gm);
//				gm.GetComponent<MeshRenderer>().material.color = Color.green;
				colorPanle.SetActive (true);

			}
		}
	
	}

	public void GButtonDown()
	{
		GameObject obj = GameObject.Find("Sphere");
		obj.GetComponent<MeshRenderer> ().material.color = Color.green;
		colorPanle.SetActive (false);
	}
		
}

4，找到对象，然后获取下面的脚本，调用脚本里面的函数。

gaze = GameObject.Find ("Gaze").GetComponent<GameGaze>();

gaze.GetPos (light.gameObject, ref x, ref y);
GetPos函数在Gaze游戏对象下面的脚本 GameGaze里面。