wall.cs

using UnityEngine;

using System.Collections;

public class Wall : MonoBehaviour {

public GameObject BulletSpark;

public AudioClip wallHit;

void OnCollisionEnter(Collision Col)

{

if(Col.transform.tag == "Bullet")

{

audio.clip = wallHit;

audio.Play();

GameObject newSpark = Instantiate(BulletSpark,Col.transform.position,Quaternion.LookRotation(-Col.transform.position))as GameObject;  //spark position : back -> front

Destroy(newSpark,8.0f);

Destroy(Col.gameObject);

}

}

}