Unity 操纵方块碰撞其他物体 使其他物体变色

操纵的方块上面的脚本：

using UnityEngine;

using System.Collections;

public class playerScript : MonoBehaviour {
delegate void  CHANGECOLOR(Color color);
event CHANGECOLOR changeMyColor;
event CHANGECOLOR changeMyColor1;
// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
float a = Input.GetAxis ("Horizontal");
float b = Input.GetAxis ("Vertical");
transform.position +=transform.forward* b * 10 * Time.deltaTime;
if(b<0){
b = -b;
}
transform.Rotate (Vector3.up * a *50 *Time.deltaTime);

if (Input.GetKeyDown(KeyCode.Space)) {
//判断事件不为空
if (changeMyColor != null ) {
changeMyColor (Color.yellow);

}
if (changeMyColor1 != null) {
changeMyColor1 (Color.red);
}

}
}
void OnCollisionEnter(Collision other){
//事件绑定
if (other.collider.tag == "cube") {
changeMyColor += other.collider.GetComponent<ChangecolorScript> ().ChangeColor;

}
if (other.collider.tag == "Player") {
changeMyColor1 += other.collider.GetComponent<Changecolor1Script> ().ChangeColor;
}
}

}

被碰撞的其他物体的代码

物体一

using UnityEngine;

using System.Collections;

public class ChangecolorScript : MonoBehaviour {
//player绑定的方法
public void ChangeColor(Color color){
GetComponent<MeshRenderer> ().material.color = color;

}

}

物体二

using UnityEngine;

using System.Collections;

public class Changecolor1Script : MonoBehaviour {

public void ChangeColor(Color color){
GetComponent<MeshRenderer> ().material.color = color;

}

}