In this part we will create a Sound Manager which will hold and play our sound effects. We will also write the C# code required to make our ball ricochet off of paddles, walls and goals.

Because many people asked I will also use the Windows version of Unity in this tutorial and show you how to create our sprites using Gimp. This tutorial series isn’t just about Pong. I will make numerous other games including games like Space Invaders, Pacman, Tetris, Mario and others. If there is a 2D game you’d like to see tell me and I’ll see what I can do.

I’ll finish Pong in the next video and will cover the following topics : Collision Detection, Animation, AI Controlled Competitors, Physics, Keyboard Input, Unity User Interfaces, Splash Screens, Sound Effects, Background Music, Build Settings and more.

If you like tutorials like this consider donating a $1 on Patreon.

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Code From the Tutorial

Ball.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Ball : MonoBehaviour {

    // Balls default movement speed
    public float speed = 30;

    // The balls Rigidbody component
    private Rigidbody2D rigidBody;

    // Used to play sound effects
    private AudioSource audioSource;

	// Use this for initialization
	void Start () {

        // Get reference to the ball Rigidbody
        rigidBody = GetComponent<Rigidbody2D>();

        // When the ball is created move it to
        // the right (1,0) at the desired speed
        rigidBody.velocity = Vector2.right * speed;

	}

    // Called every time a ball collides with something
    // the object it hit is passed as a parameter
    void OnCollisionEnter2D(Collision2D col)
    {
     
        // If the LeftPaddle or RightPaddle hit the
        // ball simulate the ricochet
        if ((col.gameObject.name == "LeftPaddle") || (col.gameObject.name == "RightPaddle"))
        {

            HandlePaddleHit(col);

        }

        // WallBottom or WallTop
        if ((col.gameObject.name == "WallBottom") || (col.gameObject.name == "WallTop"))
        {
            // Play the sound effect
            SoundManager.Instance.PlayOneShot(SoundManager.Instance.wallBloop);
        }

        // LeftGoal or RightGoal
        if ((col.gameObject.name == "LeftGoal") || (col.gameObject.name == "RightGoal"))
        {
            // Play the sound effect
            SoundManager.Instance.PlayOneShot(SoundManager.Instance.goalBloop);

            // TODO Update Score UI

            // Move the ball to the center of the screen
            transform.position = new Vector2(0, 0);

        }

    }

    void HandlePaddleHit(Collision2D col)
    {

        // Find y for the ball vector based
        // on where the ball hit the paddle
        // Above the center y angles up
        // Below the center y angles down
        float y = BallHitPaddleWhere(transform.position,
            col.transform.position,
            col.collider.bounds.size.y);

        // Vector ball moves to
        Vector2 dir = new Vector2();

        // Go left or right on the x axis
        // depending on which panel was hit
        if(col.gameObject.name == "LeftPaddle")
        {
            dir = new Vector2(1, y).normalized;
        }

        if (col.gameObject.name == "RightPaddle")
        {
            dir = new Vector2(-1, y).normalized;
        }

        // Change the velocity / direction of ball
        // You assign a vector to velocity
        rigidBody.velocity = dir * speed;

        // Play sound effect
        SoundManager.Instance.PlayOneShot(SoundManager.Instance.hitPaddleBloop);

    }

    // Find y for the ball vector based
    // on where the ball hit the paddle
    float BallHitPaddleWhere(Vector2 ball, Vector2 paddle, float paddleHeight)
    {
        return (ball.y - paddle.y) / paddleHeight;
    }

}

SoundManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SoundManager : MonoBehaviour {

    // Holds the single instance of the SoundManager
    // that can be accessed from any other script
    public static SoundManager Instance = null;

    // Will hold the sound effects
    public AudioClip goalBloop;
    public AudioClip lossBuzz;
    public AudioClip hitPaddleBloop;
    public AudioClip winSound;
    public AudioClip wallBloop;

    // Refers to the AudioSource added to
    // SoundManager to play sound effects
    private AudioSource soundEffectAudio;

    // Use this for initialization
    void Start () {
		
        // This is a singleton that makes sure you only
        // ever have one SoundManager
        // If someone tries to create another destroy it
        if (Instance == null)
        {
            Instance = this;
        } else if(Instance != this)
        {
            Destroy(gameObject);
        }

        /* YOU ACTUALLY DON'T NEED THIS
        AudioSource[] sources = GetComponents<AudioSource>();

        foreach(AudioSource source in sources)
        {
            if(source.clip == null)
            {
                soundEffectAudio = source;
            }
        }
        */

        // Use this instead
        AudioSource theSource = GetComponent ();
	soundEffectAudio = theSource;

	}
	
    // Any script can call this to play a sound effect
	public void PlayOneShot(AudioClip clip)
    {
        soundEffectAudio.PlayOneShot(clip);
    }
}

MovePaddle.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MovePaddle : MonoBehaviour {

    // Speed paddles move
    public float speed = 30;

    // Called each time the frame updates
    // but this is used instead of update
    // when using Rigidbody
    void FixedUpdate()
    {
        // Check to see if keys associated with
        // vertical movement is being pressed
        float vertPress = Input.GetAxisRaw("Vertical");

        // Move the paddle in the y direction
        // depending on the keys pressed and
        // the desired speed
        GetComponent<Rigidbody2D>().velocity = new Vector2(0, vertPress) * speed;
    }

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