gistfile1.cs

using UnityEngine;
using System.Collections;

public class myscript : MonoBehaviour {
//	int counter =0;
//	GameObject obj = null;

	// Use this for initialization
	void Start () {
		GameObject[] objs = GameObject.FindGameObjectsWithTag ("Player");
		foreach (GameObject obj in objs) {

			//colorオブジェクトを取得
			Color c = obj.renderer.material.color;
			//透明度を1に設定
			c.a = 1f;
			obj.renderer.material.color = c;

			//ShaderにTransparent/Diffuseを設定
			obj.renderer.material.shader = Shader.Find ("Transparent/Diffuse");
		}
	
	}
	
	// Update is called once per frame
	void Update () {
		GameObject cube = GameObject.Find ("Cube");

		try{
			cube.transform.Rotate(1f,-1f,-1f);
		}catch(System.Exception e){}



		Move (KeyCode.LeftArrow, -1f, 0, 1f);
		Move (KeyCode.RightArrow, 1f, 0, -1f);
		Move (KeyCode.UpArrow, 1f, 0, 1f);
		Move (KeyCode.DownArrow, -1f, 0, -1f);

		
			
	
	}

	void Move(KeyCode key,float x,float y,float z){
		if (Input.GetKey (key)) {
			rigidbody.AddForce (new Vector3 (x, y, z));
		}
	}

	void OnCollisionEnter(Collision collision){
		if (collision.gameObject.tag == "Player") {
			Color c = collision.gameObject.renderer.material.color;
			//半透明にする
			c.a = 0.25f;
			collision.gameObject.renderer.material.color = c;
		}
	}

	void OnCollisionStay(Collision collision){
	}

	void OnCollisionExit(Collision collision){
		if (collision.gameObject.tag == "Player") {
			Color c = collision.gameObject.renderer.material.color;
			c.a = 1f;
			collision.gameObject.renderer.material.color = c;
		}
	}
}