This document provides instructions for creating a top-down space shooter game in Unity. It includes setting up the player ship object with movement controls, firing bullets, creating lighting and a background, and destroying bullets when they exit the boundary. Key steps are importing a space shooter tutorial package, adding scripts to control ship movement and firing, spawning bullet prefabs, and destroying bullets using a trigger collider on the boundary object.

1. Space shooter遊戲
Revised on March 28, 2019
⼀款俯視⾓太空射擊遊戲，學習場景光
照設定、戰機移動控制、射擊控制、隕
石群生成、敵動迴避移動、爆炸效果、
背景音樂

2.  滙入時取消勾選ProjectSettings項目
Space Shooter tutorial套件
2

3.  https://unity3d.com/learn/tutorials/projects/space-shooter-
tutorial
線上教學影片
3

4.  新增3D專案
 選單命令File> New Project…
 專案名稱Space shooter
 儲存預設場景
 Main.unity
 滙入Space Shooter tutorial.unitypackage
 選單命令Assets> Import Package> Custom Package…
專案設定 1/2
4

5.  設定場景大小
 選單命令File> Build Settings…
 點擊Player Settings...按鈕
 Fullscreen Mode = Windowed
 Default Screen Width: 600
 Default Screen Height: 900
專案設定 2/2
5

6.  拖曳Modelsvehicle_playerShip到Hiearchy面板
 重新命名：Player
 重置Transform參數值
 設定Player戰機為剛體物件
 選單命令Component> Physics> Rigidbody
 取消勾選Use Gravity以符合外太空無重力環境
建立玩家戰機物件 1/2
6

7.  在Player戰機上加上網格碰撞器
 選單命令Component> Physics> Mesh Collider
 勾選Convex
 勾選Is Trigger
 簡化網格，拖曳Modelsplayer_ship_collider到Mesh欄
 設定Player戰機引擎噴射效果
 拖曳PrefabsVFXEnginesengines_player預製物件成為Player子物件
建立玩家戰機物件 2/2
7

8.  重置Main Camera之Transform參數值
 使Main Camera朝下
 Rotation(X, Y, Z) = (90, 0, 0)
 使Main Camera移動到Player戰機上方
 Position(X, Y, Z) = (0, 10, 0)
 將Main Camera投影方式設定為正交投影
 Projection = Orthographic
 Size = 10
攝影機設定 1/2
8

9.  調整Main Camera之Z軸位置來變更Player戰機初始顯示位置
 Position(X, Y, Z) = (0, 10, 5)
 設定Main Camera鏡頭底色
 Clear Flags = Solid Color
 Background = black
攝影機設定 2/2
9

10.  刪除Directional Light
 取消環境光
 選單命令Window> Rendering> Lighting Settings開啟Lighting面板
 Skybox Material = none
 Ambient Color = black
光照設定 1/3
10

11.  建立主光源
 選單命令GameObject> Light> Directional Light，更名為Main
Light
 重置Transform
 調整光線⾓度，Rotation(X, Y, Z) = (20, -115, 0)
 建立補光
 選取Main Light，Ctrl-D複製，更名為Fill Light
 重置Transform
 調整補光強度，Intensity = 0.5
 調整補光⾓度，Rotation(X, Y, Z) = (5, 125, 0)
 調整補光顏色，Color(R, G, B) = (128, 192, 192)
光照設定 2/3
11

12.  建立邊緣反射光
 複製Fill Light，更名為Rim Light
 重置Transform
 調整邊緣反射光顏色，Color = white
 調整邊緣反射光⾓度，Rotation(X, Y, Z) = (-15, 65, 0)
 調整邊緣反射光強度，Intensity = 0.25
 管理光源物件
 選單命令GameObject> Create Empty，更名為Lighting
 重置Transform
 Position(X, Y, Z) = (0, 100, 0)
 將Main Light、Fill Light及Rim Light拖曳到Lighting下做為子物件
光照設定 3/3
12

13.  選單命令GameObject> 3D Object> Quad，新增Quad做為背景物件，
更名為Background
 重置Transform屬性值
 使Background物件面向Main Camera
 Rotation(X, Y, Z) = (90, 0, 0)
 調整Background物件大小，使其可以填滿整個遊戲畫面
 Scale(X, Y, Z) = (15, 30, 0)
 設定背景材質
 拖曳Texturestile_nebula_green_diff到Background上
設定遊戲背景 1/2
13

14.  移除Mesh Collider
 將材質Shader欄變更為Unlit/Texture
 調整Background物件位置到Player戰機下方
 Position(X, Y, Z) = (0, -10, 0)
設定遊戲背景 2/2
14

15.  在Player物件加上PlayerController程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerController : MonoBehaviour {
void FixedUpdate () {
Rigidbody rigidBody = GetComponent<Rigidbody> ();
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");
Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
rigidBody.velocity = movement;
}
}
玩家戰機移動控制 1/5
15

16.  執行測試，可使用方向鍵移動Player戰機，但是…
 移動速度很慢
 在PlayerController程式腳本加入速度參數
public class PlayerController : MonoBehaviour {
public float speed;
void FixedUpdate () {
Rigidbody rigidBody = GetComponent<Rigidbody> ();
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");
Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
rigidBody.velocity = movement * speed;
}
}
玩家戰機移動控制 2/5
16

17.  將PlayerController之Speed欄設定為10
 執行測試，Player戰機移動速度變快了，但是…
 Player戰機會跑出螢幕
 修改PlayerController程式腳本，限制Player戰機移動範圍
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
[System.Serializable]
public class Boundary {
public float xMin, xMax, zMin, zMax;
}
玩家戰機移動控制 3/5
17

18. public class PlayerController : MonoBehaviour {
public float speed;
public float tilt;
public Boundary boundary;
void FixedUpdate () {
Rigidbody rigidBody = GetComponent<Rigidbody> ();
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");
Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
rigidBody.velocity = movement * speed;
rigidBody.position = new Vector3 (
Mathf.Clamp (rigidBody.position.x, boundary.xMin, boundary.xMax),
0.0f,
Mathf.Clamp (rigidBody.position.z, boundary.zMin, boundary.zMax));
rigidBody.rotation = Quaternion.Euler (
0.0f, 0.0f, rigidBody.velocity.x * -tilt);
}
}
玩家戰機移動控制 4/5
18

19.  設定Player戰機之Boundry值
 調整Player戰機Position之X值，測試最左及最右位置值
 調整Player戰機Position之Z值，測試上方及下方位置值
 執行測試，Player戰機不會跑出場景範圍了
玩家戰機移動控制 5/5
19

20.  選單命令GameObject> Create Empty，更名為Bolt
 重置Transform屬性值
 選單命令GameObject> 3D Object> Quad，更名為VFX
 重置Transform屬性值
 使VFX面向Main Camera
 Rotation(X, Y, Z) = (90, 0, 0)
 移除Mesh Collider元件
 拖曳VFX成為Bolt子物件
建立玩家戰機子彈 1/5
20

21.  選單命令Assets> Create> Material新增材質球，更名為
fx_bolt_orange
 Shader = Mobile/Particles/Additive
 Particle Texture = fx_lazer_orange_dff
 拖曳fx_bolt_orange材質到VFX物件上
建立玩家戰機子彈 2/5
21

22.  Bolt物件加上Rigidbody元件
 取消勾選Use Gravity
 Bolt物件加上Capsule Collider元件
 Direction = Z-Axis
 Radius = 0.03，Height = 0.5
 勾選Is Trigger
建立玩家戰機子彈 3/5
22

23.  Bolt物件加上Mover程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Mover : MonoBehaviour {
[SerializeField]
private float speed;
// Use this for initialization
void Start () {
GetComponent<Rigidbody>().velocity = transform.forward * speed;
}
}
建立玩家戰機子彈 4/5
23

24.  將Bolt物件拖到Prefabs資料夾做為預製物件
 Speed = 20
 刪除場景中的Bolt物件
 執行測試，將Bolt預製物件拖曳到Hierarchy面板，檢視Game視窗，
子彈是否向前飛去
建立玩家戰機子彈 5/5
24

25.  選單命令GameObject> Create Empty，更名為Shot Spawn
 重置Transform
 拖曳Shot Spawn成為Player子物件
 調整Shot Spawn位置到戰機之前端，Position(X, Y, Z) = (0, 0, 1)
玩家戰機子彈發射控制 1/3
25

26.  編輯Player物件之PlayerController程式腳本
public class PlayerController : MonoBehaviour {
public float speed;
public float tilt;
public Player_Boundary boundary;
public GameObject shot;
public Transform shotSpawn;
public float fireRate;
private float nextFire;
void Update () {
if (Input.GetButton("Fire1") && Time.time > nextFire) {
nextFire = Time.time + fireRate;
Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
}
}
...
}
玩家戰機子彈發射控制 2/3
26

27.  拖曳Bolt預製物件到Player Controller之Shot欄
 拖曳Shot Spawn物件到Player Controller之Shot Spawn欄
 將Player Controller之Fire Rate欄值設為0.25
 執行測試，按下滑鼠左鍵可發射子彈，但是...
 檢視Hierarchy面板，子彈物件會不斷生成，但不會自動銷毀
玩家戰機子彈發射控制 3/3
27

28.  選單命令GameObject> 3D Object> Cube，更名為Boundary
 重置Transform屬性值
 勾選Box Collider之Is Trigger
 使Boundary物件置中顯示
 Position (X, Y, Z) = (0, 0, 5) 參照Main Camera之Z座標設定
 使Boundary物件涵蓋整個遊戲場景
 Scale (X, Y, Z) = (15, 1, 20)
 移除Mesh Renderer元件
 移除Mesh Filter元件
設定玩家戰機子彈邊界 1/3
28

29. 設定玩家戰機子彈邊界 2/3
29

30.  Boundary物件加上DestroyByBoundry程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class DestroyByBoundary : MonoBehaviour {
void OnTriggerExit(Collider other) {
Destroy(other.gameObject);
}
}
 測試程式，檢視Hirarchy面板，子彈物件碰到Bundary後會自動銷毀
設定玩家戰機子彈邊界 3/3
30

31.  選單命令GameObject> Create Empty，更名為Asteroid
 Position(X, Y, Z) = (0, 0, 8)
 拖曳Models/prop_asteroid_01成為Asteroid子物件
 重置prop_asteroid_01物件Transform設定
 在Asteroid物件加上Rigidbody元件
 取消勾選Use Gravity
 在Asteroid物件加上Capsule Collider元件
 調整Radius及Height使其符合物件大小
 Direction = Y-Axis
 Radius = 0.486
 Height = 1.524
建立隕石 1/4
31

32.  Asteroid物件加上RandomRotator程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class RandomRotator : MonoBehaviour {
[SerializeField]
private float tumble;
void Start () {
GetComponent<Rigidbody>().angularVelocity = Random.insideUnitSphere*tumble;
}
}
 Asteroid物件之Tumble設定為5
 執行測試，隕石會自主轉動，但是...
 子彈會直接穿過隕石
建立隕石 2/4
32

33.  Asteroid物件加上DestroyByContact程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class DestroyByContact : MonoBehaviour {
void OnTriggerEnter(Collider other) {
if (other.CompareTag ("Boundary")) {
return;
}
Destroy(other.gameObject);
Destroy(gameObject);
}
}
建立隕石 3/4
33

34.  將Boundary物件之Tag設定為Boundary
 執行測試
 子彈碰到隕石時，子彈與隕石都會自動銷毀
建立隕石 4/4
34

35.  編輯DestroyByContact程式腳本
public class DestroyByContact : MonoBehaviour {
[SerializeField]
private GameObject explosion;
void OnTriggerEnter(Collider other) {
if (other.CompareTag ("Boundary")) {
return;
}
Instantiate(explosion, transform.position, transform.rotation);
Destroy(other.gameObject);
Destroy(gameObject);
}
}
 拖曳PrefabsVFXExplosionsexplosion_asteroid預製物件到
Explosion欄
爆破效果 1/4
35

36.  執行測試，子彈碰到隕石時隕石會有爆破效果，但是...
 戰機撞到隕石時，隕石會爆破效果而戰機則是直接銷毀
 將Player物件之Tag設定為Player
爆破效果 2/4
36

37.  編輯DestroyByContact程式腳本
public class DestroyByContact : MonoBehaviour {
[SerializeField]
private GameObject explosion;
[SerializeField]
private GameObject playerExplosion;
void OnTriggerEnter(Collider other) {
...
Instantiate(explosion, transform.position, transform.rotation);
if (other.CompareTag ("Player")) {
Instantiate(playerExplosion,
other.transform.position, other.transform.rotation);
}
Destroy(other.gameObject);
Destroy(gameObject);
}
 拖曳PrefabsVFXExplosionsexplosion_player預製物件到
Player Explosion欄
爆破效果 3/4
37

38.  執行測試，戰機撞到隕石時，隕石與戰機都會產生爆破效果後銷毀
 Asteroid物件加上Mover程式腳本
 設定Speed為-5
 執行測試，隕石會自動向下墜落
爆破效果 4/4
38
 將Asteroid物件拖曳到Prefabs資料夾做
成預製物件
 刪除場景上的Asteroid物件

39.  選單命令GameObject> Create Empty，更名為Game Controller
 重置Transform
 設定Tag為GameController
遊戲控制 1/3
39

40.  Game Controller物件加上GameController程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class GameController : MonoBehaviour {
[SerializeField]
private GameObject hazard;
[SerializeField]
private 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);
}
}
遊戲控制 2/3
40

41.  拖曳Asteroid預製物件到Hazard欄
 設定SpawnValues(X, Y, Z) = (6, 0, 16)
 執行測試，每次執行隕石會由不同位置墜落
遊戲控制 3/3
41

42.  編輯GameController程式腳本
public class GameController : MonoBehaviour {
[SerializeField]
private GameObject hazard;
[SerializeField]
private Vector3 spawnValues;
[SerializeField]
private int hazardCount;
[SerializeField]
private float spawnWait;
[SerializeField]
private float startWait;
[SerializeField]
private float waveWait;
void Start () {
StartCoroutine (SpawnWaves ());
}
設定隕石群 1/4
42

43. 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);
}
}
}
設定隕石群 2/4
43

44.  Game Controller參數
 Hazard Count = 10
 Spawn Wait = 0.4
 Start Wait = 1
 Wave Wait = 4
 執行測試，隕石會定時自動生成，但是...
 擊破隕石時生成的爆破效果物件不會自動銷毀
設定隕石群 3/4
44

45.  建立DestroyByTime程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class DestroyByTime : MonoBehaviour {
[SerializeField]
private float lifetime;
void Start () {
Destroy (gameObject, lifetime);
}
}
設定隕石群 3/4
45

46.  在explosion_asteroid預製物件及explosion_player預製物件加
入DestroyByTime程式腳本
 Lifetime設定為2
 執行測試，隕石會定時自動生成，爆破特效物件也會在2秒後自動銷毀
設定隕石群 4/4
46

47.  在explosion_asteroid預製物件加上Audio Source元件
 拖曳Audioexplosion_asteroid到explosion_asteroid預製物件之
AudioClip欄
 勾選Play On Awake
加入音效 1/4
47

48.  在explosion_player預製物件加上Audio Source元件
 拖曳Audioexplosion_player到AudioClip欄
 勾選Play On Awake
加入音效 2/4
48

49.  在Player物件加上Audio Source元件
 拖曳Audioweapon_player到AudioClip欄
 取消勾選Play On Awake
 Volume設為0.5
加入音效 3/4
49

50.  編輯Player物件之Player Controller程式腳本
void Update () {
if (Input.GetButton("Fire1") && Time.time > nextFire) {
nextFire = Time.time + fireRate;
Instantiate(shot, shotSpawn.position, shotSpawn.rotation);
GetComponent<AudioSource>().Play();
}
}
加入音效 4/4
50

51.  在GameController物件加上Audio Source元件
 拖曳Audiomusic_background到GameController物件之AudioClip欄
 勾選Play On Awake
 勾選Loop
 Volume設為0.5
加入背景音樂
51

52.  選單命令GameObject> UI> Text，更名為Score Text
 重置Rect Transform
 Color = white
 Anchor Presets = left, top (同時按Shift + Alt)
計算及顯示分數 1/6
52

53.  編輯GameController程式腳本
using UnityEngine.UI;
public class GameController : MonoBehaviour {
...
public float waveWait;
[SerializeField]
private Text scoreText;
private int score;
void Start () {
score = 0;
UpdateScore ();
StartCoroutine (SpawnWaves ());
}
計算及顯示分數 2/6
53

54. public void AddScore (int newScoreValue) {
score += newScoreValue;
UpdateScore ();
}
void UpdateScore () {
scoreText.text = "Score: " + score;
}
...
}
計算及顯示分數 3/6
54

55.  拖曳Score Text物件到Game Controller物件之Score Text欄
計算及顯示分數 4/6
55

56.  編輯DestroyByContact程式腳本
public class DestroyByContact : MonoBehaviour {
...
private GameObject playerExplosion;
[SerializeField]
private int scoreValue;
private GameObject gameController;
void Start () {
gameController = GameObject.Find ("Game Controller");
}
void OnTriggerEnter(Collider other) {
...
Destroy(other.gameObject);
Destroy(gameObject);
gameController.GetComponent<GameController> ().AddScore (scoreValue);
}
}
計算及顯示分數 2/6
56

57.  將Asteroid預製物件之Score Value設定為10
 執行測試，每擊破⼀個隕石增加10分
計算及顯示分數 3/6
57

58.  選單命令GameObject> UI> Text，更名為Restart Text
 重置Rect Transform
 Width = 200
 Anchor Presets = right, top (同時按Shift + Alt)
 Color = white
 Paragraph Alignment = left
結束遊戲作業 1/7
58

59.  選單命令GameObject> UI> Text，更名為Gameover Text
 重置Rect Transform
 Anchor Presets = middle, center
 Font Size = 18
 Paragraph Alignment = center
 Color = yellow
結束遊戲作業 2/7
59

60.  編輯GameController程式腳本
using UnityEngine.SceneManagement;
public class GameController : MonoBehaviour {
...
private int score;
[SerializeField]
private Text restartText;
[SerializeField]
private Text gameOverText;
private bool gameOver;
private bool restart;
void Start () {
gameOver = false;
restart = false;
restartText.text = "";
gameOverText.text = "";
score = 0;
...
}
結束遊戲作業 3/7
60

61. IEnumerator SpawnWaves () {
...
yield return new WaitForSeconds (waveWait);
if (gameOver) {
restartText.text = "Press 'R' for Restart";
restart = true;
break;
}
}
}
結束遊戲作業 4/7
61

62. void Update () {
if (restart) {
if (Input.GetKeyDown (KeyCode.R)) {
SceneManager.LoadScene ("Main");
}
}
}
public void GameOver () {
gameOverText.text = "Game Over!";
gameOver = true;
}
}
結束遊戲作業 5/7
62

63.  編輯DestroyByContact程式腳本
public class DestroyByContact : MonoBehaviour {
...
void OnTriggerEnter(Collider other) {
...
if (other.tag == "Player") {
Instantiate(playerExplosion,
other.transform.position,
other.transform.rotation);
gameController.GetComponent<GameController> ().GameOver();
}
...
}
}
結束遊戲作業 6/7
63

64.  拖曳Restart Text物件到Game Controller物件之Restart Text欄
 拖曳Gameover Text物件到Game Controller物件之Game Over
Text欄
 執行測試，玩家戰機會顯示Game over!，等下⼀波隕石群時顯示
Press 'R' for Restart，按下R鍵即可重玩
結束遊戲作業 7/7
64

65.  將PrefabsAsteroid預製物件更名為Asteroid01
 設定Asteroid01之Tag屬性值為"Enemy"
 拖曳PrefabsAsteroid01預製物件到場景上
 Ctrl-D複製2份，分別更名為Asteroid02及Asteroid03
 拖曳Asteroid02及Asteroid03到Prefabs資料夾做成預製物件
 刪除場景上的Asteroid01、Asteroid02及Asteroid03
建立不同隕石 1/5
65

66.  開啟Asteroid02預製物件
 拖曳Modelsprop_asteroid_02成為Asteroid02子物件
 刪除Asteroid02prop_asteroid_01子物件
 Capsule Collider
 Radius = 0.45
 Height = 1.37
 Direction = X-Axis
建立不同隕石 2/5
66

67.  開啟Asteroid03預製物件
 拖曳Modelsprop_asteroid_03成為Asteroid03子物件
 刪除Asteroid03prop_asteroid_01子物件
 Capsule Collider
 Radius = 0.55
 Height = 1.5
 Direction = X-Axis
建立不同隕石 3/5
67

68.  更新GameController程式腳本
public class GameController : MonoBehaviour {
[SerializeField]
private GameObject hazard;
private GameObject[] hazards;
...
IEnumerator SpawnWaves () {
yield return new WaitForSeconds (startWait);
while (true) {
for (int i = 0; i < hazardCount; i++) {
GameObject hazard = hazards[Random.Range (0, hazards.Length)];
...
}
}
}
...
}
建立不同隕石 4/5
68

69.  拖曳Asteroid01、Asteroid02及Asteroid03預製物件到Game
Controller之到Hazards欄
 測試遊戲，會隨機出現不同的隕石
建立不同隕石 5/5
69

70.  拖曳PrefabsVFXStarFieldStarField預製物件到場景上
加上星空粒子特效
70

71.  Ctrl-D複製Background
 拖曳Background (1)成為Background子物件
 調整Background (1)位置使它與Background串接
 Position(X, Y, Z) = (0, -1, 0)
 Rotation(X, Y, Z) = (0, 0, 0)
 Scale(X, Y, Z) = (1, 1, 1)
捲動背景 1/4
71

72. 捲動背景 2/4
72
Background
Background (1)

73.  在Background加入BGScroller程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class BGScroller : MonoBehaviour {
[SerializeField]
private float scrollSpeed;
[SerializeField]
private float tileSizeZ;
private Vector3 startPosition;
void Start() {
startPosition = transform.position;
}
void Update() {
float newPosition = Mathf.Repeat (Time.time * scrollSpeed, tileSizeZ);
transform.position = startPosition + Vector3.forward * newPosition;
}
}
捲動背景 3/4
73

74.  設定BG Scroller屬性值
 Scroll Speed = -0.25
 Tile Size Z = 30
 執行測試，背景會緩慢向下捲動
捲動背景 4/4
74

75.  在PrefabsVFXExplosionsexplosion_enemy預製物件加入
DestroyByTime程式腳本
 Lifetime設定為2
 在PrefabsVFXExplosionsexplosion_enemy預製物件加上
Audio Source元件
 拖曳Audioexplosion_enemy到AudioClip欄
 勾選Play On Awake
製作敵機爆炸特效
75

76.  選單命令GameObject> Create Empty，更名為Enemy Ship
 重置Transform屬性值
 Position(X, Y, Z) = (0, 0, 9)
 Tag = Enemy
 拖曳Modelsvehicle_enemyShip成為Enemy Ship子物件
 Rotation(X, Y, Z) = (0, 180, 0)
 拖曳PrefabsVFXEnginesengines_enemy預製物件成為Enemy
Ship子物件
建立敵機 1/4
76

77.  在Enemy Ship加入Rigidbody元件
 取消勾選Use Gravity
 在Enemy Ship加入Shpere Collider元件
 勾選Is Trigger
 Center(X, Y, Z) = (0, 0, -0.3)
 Radius = 0.85
建立敵機 2/4
77

78.  在Enemy Ship加入DestroyByContact程式腳本
 拖曳PrefabsVFXExplosionsexplosion_enemy預製物件到
Explosion欄
 拖曳PrefabsVFXExplosionsexplosion_player預製物件到Player
Explosion欄
 Score Value = 20
 執行測試，射擊敵機會爆炸，得20分，但…
 敵機不會移動，也不會主動攻擊
建立敵機 4/4
78

79.  Ctrl-D複製Materialsfx_bolt_orange，更名為fx_bolt_cyan
 Particle Texture = fx_lazer_cyan_dff
製作敵機雷射武器 1/4
79

80.  在Enemy Ship下新增空子物件，更名為Shot Spawn
 Position(X, Y, Z) = (0, 0, -0.5)
 Rotation(X, Y, Z) = (0, 180, 0)
 拖曳PrefabsBolt成為Shot Spawn子物件，更名為Bolt Enemy
 重設Bolt EnemyVFX之Materials = fx_bolt_cyan
製作敵機雷射武器 2/4
80

81.  在Bolt Enemy加入DestroyByContact程式腳本
 修改DestroyByContact程式腳本
void OnTriggerEnter(Collider other) {
if (other.CompareTag ("Boundary") || other.CompareTag ("Enemy")) {
return;
}
if (explosion != null)
Instantiate(explosion, transform.position, transform.rotation);
...
}
製作敵機雷射武器 3/4
81

82.  拖曳PrefabsVFXExplosionsexplosion_player到Destroy By
Contact之Player Explosion欄
 設定Bolt Enemy之Tag屬性值為"Enemy"
 拖曳Bolt Enemy到Prefabs資料夾做成預製物件
 刪除Hierarchy窗格中Shot Spawn之Bolt Enemy子物件
製作敵機雷射武器 4/4
82

83.  拖曳Audioweapon_enemy到Enemy Ship
 取消勾選Play on Awake
 在Enemy Ship加入WeaponController程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class WeaponController : MonoBehaviour {
[SerializeField]
private GameObject shot;
[SerializeField]
private Transform shotSpawn;
[SerializeField]
private float fireRate;
[SerializeField]
private float delay;
private AudioSource audioSource;
敵機雷射發射控制 1/3
83

84. void Start () {
audioSource = GetComponent<AudioSource> ();
InvokeRepeating ("Fire", delay, fireRate);
}
void Fire () {
Instantiate (shot, shotSpawn.position, shotSpawn.rotation);
audioSource.Play ();
}
}
敵機雷射發射控制 2/3
84

85.  設定Weapon Controller參數
 拖曳PrefabsBolt Enemy預製物件到Shot欄
 拖曳Enemy Ship之Shot Spawn子物件到Shot Spawn欄
 Fire Rate = 1.5
 執行測試，敵機自動發射雷射
敵機雷射發射控制 3/3
85

86.  在Enemy Ship加入Mover程式腳本
 Speed = -5
 執行測試，敵機如同隕石向下移動，但...
 敵機移動欠缺機動性
敵機移動
86

87.  在Enemy Ship新增EvasiveManeuver程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class EvasiveManeuver : MonoBehaviour {
[SerializeField]
private float dodge;
[SerializeField]
private float smoothing;
[SerializeField]
private float tilt;
[SerializeField]
private Vector2 startWait;
[SerializeField]
private Vector2 maneuverTime;
[SerializeField]
private Vector2 maneuverWait;
[SerializeField]
private Boundary boundary;
敵機機動迴避 1/3
87

88. private float currentSpeed;
private float targetManeuver;
private Rigidbody rb;
void Start () {
rb = GetComponent <Rigidbody> ();
currentSpeed = rb.velocity.z;
StartCoroutine (Evade ());
}
IEnumerator Evade() {
yield return new WaitForSeconds (Random.Range (startWait.x, startWait.y));
while (true) {
targetManeuver =
Random.Range (1, dodge) * -Mathf.Sign (transform.position.x);
yield return new WaitForSeconds (
Random.Range (maneuverTime.x, maneuverTime.y));
targetManeuver = 0;
yield return new WaitForSeconds (
Random.Range (maneuverWait.x, maneuverWait.y));
}
}
敵機機動迴避 2/3
88

89. void FixedUpdate () {
float newManeuver = Mathf.MoveTowards (
rb.velocity.x,
targetManeuver,
Time.deltaTime * smoothing);
rb.velocity = new Vector3 (newManeuver, 0.0f, currentSpeed);
rb.position = new Vector3 (
Mathf.Clamp (rb.position.x, boundary.xMin, boundary.xMax),
0.0f,
Mathf.Clamp (rb.position.z, boundary.zMin, boundary.zMax));
rb.rotation = Quaternion.Euler (0.0f, 0.0f, rb.velocity.x * -tilt);
}
}
敵機機動迴避 3/3
89

90.  設定Evasive Maneuver屬性值
 Dodge = 5
 Smoothing = 7.5
 Tilt = 10
 startWait(X, Y) = (0.5, 1)
 Maneuver Time(X, Y) = (1, 2)
 Maneuver Wait(X, Y) = (1, 2)
 Boundary
 X Min = -6, X Max = 6
 Z Min = -20, Z Max = 20
敵機機動迴避 4/3
90

91.  執行測試，敵機會機動進行迴避移動
 拖曳Enemy Ship到Prefabs資料夾做成預製物件
 刪除Hierarchy窗格中的Enemy Ship
敵機機動迴避 5/3
91

92.  拖曳Enemy Ship預製物件到Game Controller之Hazards
 執行測試，會隨機產生隕石及敵機
更新遊戲控制
92