Boundaries, Hazards and Enemies

Unity ID

Project

[Archived] Space Shooter

Tutorial

Beginner

50 Mins

Unity Technologies

Overview

You have completed 0% of this Tutorial.

Summary

This next tutorial in the Space Shooter series covers adding game screen boundaries, creating asteroid "hazards" for the ship, implementing a game controller, and setting up enemy spawning.

Language

English

Recommended Unity Versions

5.1

Tutorial Materials

Space Shooter - Main Project Page

Project

[Archived] Space Shooter

Tutorial

Boundaries, Hazards and Enemies

Boundary

Creating a bounding box to destroy any object that leaves the game area.
 
Please note that this project was developed for Unity version 4. It currently works, and has been checked, with Unity version 5.1. Please turn annotations on while watching the video, as we can add annotations to the videos when there are discrepancies between the recorded content and the current version of Unity.
Get the Upgrade Guide for Unity 5 here.
Please refer to the Official Q&A Page on the Forums for an Upgrade FAQ and to ask any questions.
DestroyByBoundary
using UnityEngine;
using System.Collections;

public class DestroyByBoundary : MonoBehaviour
{
    void OnTriggerExit(Collider other)
    {
        Destroy(other.gameObject);
    }
}

js
#pragma strict

function OnTriggerExit(other : Collider)
{
    Destroy(other.gameObject);
}

boo
import UnityEngine
import System.Collections


public class DestroyByBoundary(MonoBehaviour):

    private def OnTriggerExit(other as Collider):
        Destroy(other.gameObject)

Creating hazards

Create an asteroid hazard to challenge the player.
 
Please note that this project was developed for Unity version 4. It currently works, and has been checked, with Unity version 5.1. Please turn annotations on while watching the video, as we can add annotations to the videos when there are discrepancies between the recorded content and the current version of Unity.
Get the Upgrade Guide for Unity 5 here.
Please refer to the Official Q&A Page on the Forums for an Upgrade FAQ and to ask any questions.
RandomRotator
using UnityEngine;
using System.Collections;

public class RandomRotator : MonoBehaviour
{
    public float tumble;

    void Start ()
    {
        rigidbody.angularVelocity = Random.insideUnitSphere * tumble; 
    }
}


js
var tumble : float;

function Start () : void {
    rigidbody.angularVelocity = Random.insideUnitSphere * tumble; 
}

boo
import UnityEngine
import System.Collections

public class RandomRotator(MonoBehaviour):
    public tumble as single

    private def Start():
        rigidbody.angularVelocity = (Random.insideUnitSphere * tumble)
DestroyByContact
using UnityEngine;
using System.Collections;

public class DestroyByContact : MonoBehaviour
{
    void OnTriggerEnter(Collider other) 
    {
        if (other.tag == "Boundary")
        {
            return;
        }
        Destroy(other.gameObject);
        Destroy(gameObject);
    }
}

js
function OnTriggerEnter(other : Collider) 
{
    if (other.tag == "Boundary")
    {
        return;
    }
    Destroy(other.gameObject);
    Destroy(gameObject);
}

boo
import UnityEngine
import System.Collections

public class DestroyByContact(MonoBehaviour):
    private def OnTriggerEnter(other as Collider):
        if other.tag == 'Boundary':
            return
        Destroy(other.gameObject)
        Destroy(gameObject)

Explosions

Add explosions to the scene when hazards or the player is destroyed.
 
Please note that this project was developed for Unity version 4. It currently works, and has been checked, with Unity version 5.1. Please turn annotations on while watching the video, as we can add annotations to the videos when there are discrepancies between the recorded content and the current version of Unity.
Get the Upgrade Guide for Unity 5 here.
Please refer to the Official Q&A Page on the Forums for an Upgrade FAQ and to ask any questions.
DestroyByContact
using UnityEngine;
using System.Collections;

public class DestroyByContact : MonoBehaviour
{
    public GameObject explosion;
    public GameObject playerExplosion;

    void OnTriggerEnter(Collider other) 
    {
        if (other.tag == "Boundary")
        {
            return;
        }
        Instantiate(explosion, transform.position, transform.rotation);
        if (other.tag == "Player")
        {
            Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
            gameController.GameOver ();
        }
        Destroy(other.gameObject);
        Destroy(gameObject);
    }
}

js
var explosion : GameObject;
var playerExplosion : GameObject;

function OnTriggerEnter(other : Collider) 
{
    if (other.tag == "Boundary")
    {
        return;
    }
    Instantiate(explosion, transform.position, transform.rotation);
    if (other.tag == "Player")
    {
        Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
        gameController.GameOver ();
    }
    Destroy(other.gameObject);
    Destroy(gameObject);
}

boo
import UnityEngine
import System.Collections

public class DestroyByContact(MonoBehaviour):
    public explosion as GameObject
    public playerExplosion as GameObject

    private def OnTriggerEnter(other as Collider):
        if other.tag == 'Boundary':
            return
        Instantiate(explosion, transform.position, transform.rotation)
        if other.tag == 'Player':
            Instantiate(playerExplosion, other.transform.position, other.transform.rotation)
            gameController.GameOver()
        Destroy(other.gameObject)
        Destroy(gameObject)

Game Controller

Write a controller to spawn our hazards, keep track of and display our score, end the game and allow the game to be restarted.
 
Please note that this project was developed for Unity version 4. It currently works, and has been checked, with Unity version 5.1. Please turn annotations on while watching the video, as we can add annotations to the videos when there are discrepancies between the recorded content and the current version of Unity.
Get the Upgrade Guide for Unity 5 here.
Please refer to the Official Q&A Page on the Forums for an Upgrade FAQ and to ask any questions.
GameController
using UnityEngine;
using System.Collections;

public class GameController : MonoBehaviour
{
    public GameObject hazard;
    public Vector3 spawnValues;

    void Start ()
    {
        SpawnWaves ();
    }

    void SpawnWaves ()
    {
        Vector3 spawnPosition = new Vector3 (Random.Range (-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z);
        Quaternion spawnRotation = Quaternion.identity;
        Instantiate (hazard, spawnPosition, spawnRotation);
    }
}

js
var hazard : GameObject;
var spawnValues : Vector3;

function Start () {
    SpawnWaves ();
}

function SpawnWaves () {
    var spawnPosition : Vector3= new Vector3 (Random.Range (-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z);
    var spawnRotation : Quaternion= Quaternion.identity;
    Instantiate (hazard, spawnPosition, spawnRotation);
}

boo
import UnityEngine
import System.Collections


public class GameController(MonoBehaviour):

    public hazard as GameObject
    public spawnValues as Vector3

    private def Start():
        SpawnWaves()

    private def Update():
        if restart:
            if Input.GetKeyDown(KeyCode.R):
                Application.LoadLevel(Application.loadedLevel)

    private def SpawnWaves() as IEnumerator:
        spawnPosition = Vector3(Random.Range(-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z)
        spawnRotation as Quaternion = Quaternion.identity
        Instantiate(hazard, spawnPosition, spawnRotation)

Spawning waves

Spawn infinite waves of hazards to challenge our player.
 
Please note that this project was developed for Unity version 4. It currently works, and has been checked, with Unity version 5.1. Please turn annotations on while watching the video, as we can add annotations to the videos when there are discrepancies between the recorded content and the current version of Unity.
Get the Upgrade Guide for Unity 5 here.
Please refer to the Official Q&A Page on the Forums for an Upgrade FAQ and to ask any questions.
GameController
using UnityEngine;
using System.Collections;

public class GameController : MonoBehaviour
{
    public GameObject hazard;
    public Vector3 spawnValues;
    public int hazardCount;
    public float spawnWait;
    public float startWait;
    public float waveWait;

    void Start ()
    {
        StartCoroutine (SpawnWaves ());
    }

    IEnumerator SpawnWaves ()
    {
        yield return new WaitForSeconds (startWait);
        while (true)
        {
            for (int i = 0; i < hazardCount; i++)
            {
                Vector3 spawnPosition = new Vector3 (Random.Range (-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z);
                Quaternion spawnRotation = Quaternion.identity;
                Instantiate (hazard, spawnPosition, spawnRotation);
                yield return new WaitForSeconds (spawnWait);
            }
            yield return new WaitForSeconds (waveWait);
        }
    }
}

js
var hazard : GameObject;
var spawnValues : Vector3;
var hazardCount : int;
var spawnWait : float;
var startWait : float;
var waveWait : float;

function Start () {
    SpawnWaves ();
}

function SpawnWaves () {
    yield WaitForSeconds (startWait);
    while (true)
    {
        for ( var i : int= 0; i < hazardCount; i++)
        {
             var spawnPosition : Vector3= new Vector3 (Random.Range (-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z);
             var spawnRotation : Quaternion= Quaternion.identity;
            Instantiate (hazard, spawnPosition, spawnRotation);
            yield WaitForSeconds (spawnWait);
        }
        yield WaitForSeconds (waveWait);
    }
}

boo
import UnityEngine
import System.Collections

public class GameController(MonoBehaviour):

    public hazard as GameObject
    public spawnValues as Vector3
    public hazardCount as int
    public spawnWait as single
    public startWait as single
    public waveWait as single

    private def Start():
        StartCoroutine(SpawnWaves())

    private def SpawnWaves() as IEnumerator:
        yield WaitForSeconds(startWait)
        while true:
            for i in range(0, hazardCount):
                spawnPosition = Vector3(Random.Range(-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z)
                spawnRotation as Quaternion = Quaternion.identity
                Instantiate(hazard, spawnPosition, spawnRotation)
                yield WaitForSeconds(spawnWait)
            yield WaitForSeconds(waveWait)
DestroyByTime
using UnityEngine;
using System.Collections;

public class DestroyByTime : MonoBehaviour
{
    public float lifetime;

    void Start ()
    {
        Destroy (gameObject, lifetime);
    }
}


js
var lifetime : float;

function Start ()
{
    Destroy (gameObject, lifetime);
}

boo
import UnityEngine
import System.Collections

public class DestroyByTime(MonoBehaviour):
    public lifetime as single

    private def Start():
        Destroy(gameObject, lifetime)