Score.cs

using UnityEngine;
using System.Collections;

public class Score : MonoBehaviour {

	public TextMesh currentScore;
	public GameObject ballPref;
	public Transform paddleObj;
	GameObject ball;
	int score;


	void Update () {
	
		ball = GameObject.FindGameObjectWithTag ("Ball");
		currentScore.text = " " + score;
	}

	void OnTriggerEnter (Collider other){

		if (other.tag=="Ball") {

			score += 1;
			Destroy (ball);
			(Instantiate (ballPref, new Vector3 (paddleObj.transform.position.x + 2, paddleObj.transform.position.y, 0), Quaternion.identity) as GameObject).transform.parent = paddleObj;
		}
	
	}
}