1.光源類型 2.光源參數設定

1. 電子工程系應 用 電 子 組
電 腦 遊 戲 設 計 組
Unity遊戲程式設計(09)
3D物件與光源設定
吳錫修
March 7, 2017

2. shapethefuture
 選單命令GameObject>3D Object內可找到內建3D物件
 Cube 立方體
 Sphere 球體
 Capsule 膠囊
 Cylinder 圓柱體
 Plane 平面
 Quad 四邊形
內建3D物件
2 Wu, ShyiShiou Dept. of E.E., NKUT
Plane
Quad
Cylinder
Capsule
Cube Sphere

3. shapethefuture
 選單命令Assets> Import Package> Effects
 勾選LightCookies
 勾選LightFlares
滙入光源素材
3 Wu, ShyiShiou Dept. of E.E., NKUT

4. shapethefuture
 由Transform屬性調整物件位置 (Position)、角度 (Rotation)、及大
小 (Scale)
場景3D座標系統
4 Wu, ShyiShiou Dept. of E.E., NKUT

5. shapethefuture
 光源決定遊戲場景明暗與氛圍，使場景中的物體呈現出正確的顏色，
及產生陰影效果
 選單命令GameObject>Light內可找到光源物件
 Directional Light 方向光
 Point Light 點光源
 Spotlight 聚光燈
 Area Light 區域光
 場景預設會加入方向光
設置光源 1/5
5 Wu, ShyiShiou Dept. of E.E., NKUT

6. shapethefuture
 Directional Light (方向光)
 ⼀個在無限遠處的光源，平行的照射在場景中，會影響場景中的所有物
件，類似自然界中日光的照明效果
 最不耗費圖形處理器資源的光源
 因為是無限遠處的光源，Position屬性不會影響照射效果
設置光源 2/5
6 Wu, ShyiShiou Dept. of E.E., NKUT

7. shapethefuture
 Point Light (點光源)
 ⼀個向四面八方發出光線，影響其範圍內的所有物件，類似燈泡的照明
效果
 點光源較耗用圖形處理器資源
設置光源 3/5
7 Wu, ShyiShiou Dept. of E.E., NKUT

8. shapethefuture
 Spotlight (聚光燈)
 朝某⼀方向在錐形範圍照射光線，位於錐形範圍內的物件會受到光線照
射，類似舞台上的探照燈
 聚光燈較耗用運算資源
設置光源 4/5
8 Wu, ShyiShiou Dept. of E.E., NKUT

9. shapethefuture
 Area Light (區域光)
 Area Light,俗稱面燈。由矩形單⼀面射出光線
 不能產生即時光照的效果，僅能用於光影貼圖烘焙 (Light baking)
設置光源 5/5
9 Wu, ShyiShiou Dept. of E.E., NKUT

10. shapethefuture
 Type 選擇光源類型
 Spot 聚光燈
 Directional 方向光
 Point 點光源
 Area (baked only) 區域光
 Baking 光照計算方式
 Realtime 即時計算光照效果
 Baked 執行光影貼圖時計算光照效果
 Mixed 混用
 Range 光線照射距離，適用點光源與聚光燈
 Spot Angle 聚光燈角度 (1~179)，控制光源錐形範圍，適用聚光燈
光源屬性 1/5
10 Wu, ShyiShiou Dept. of E.E., NKUT

11. shapethefuture
 Color 燈光顏色，預設為白光
 Intensity 光源強度，聚光燈與點光源預設
值為1，方向光預設值為0.5
 Cookie 光源加上⼀個有 Alpha 通道的紋
理光罩
 Cookie Size 縮放Cookie光罩，適用方向光
光源屬性 2/5
11 Wu, ShyiShiou Dept. of E.E., NKUT

12. shapethefuture
 Shadow Type 陰影類型
 No Shadow 關閉陰影
 Hard Shadow 輪廓清晰的影子
 Soft Shadow 柔邊輪廓的影子，較耗運算資源
 Strength 陰影強度，1最明顯，0消失
 Resolution 陰影解析度
 Use Quality Settings 套用Edit>Project Settings>Quality設定
 Low Resolution 低解析度
 Medium Resolution 中解析度
 High Resolution 高解析度
 Very High Resolution 超高解析度
光源屬性 3/5
12 Wu, ShyiShiou Dept. of E.E., NKUT

13. shapethefuture
 Bias 微調陰影的位置與陰影定義點，避免產生shadow acne情
形。太大的Bias值可能導致GameObject附近的陰影區域
被錯誤地點亮，而造成⼀個斷開的陰影，使GameObject
看起来好像是離開地面
 Normal Bias 微調陰影的位置與陰影定義點
 Shadow Near Plane 設定渲染陰影光源距離，光距離GameObjects
小於設定值時不會投射陰影
光源屬性 4/5
13 Wu, ShyiShiou Dept. of E.E., NKUT
shadow acne bias值太大

14. shapethefuture
 Draw Halo 開啟光源之光暈效果
 Flare 設定光源眩光效果
 Render Mode 光源渲染模式
 Auto 根據附近燈光的亮度和專案Quality設定，在運行時
決定渲染方式
 Important 逐像素進行渲染，可以得到最明顯的視覺效果
 Not Important 快速渲染
 Culling Mask 設定光源影響的圖層
光源屬性 5/5
14 Wu, ShyiShiou Dept. of E.E., NKUT

15. shapethefuture
 新增場景，檔名Lighting
 Directional Light
 Intensity = 0.3
 Main Camera
 Position (x, y ,z) = (0, 2, -9)
 Rotation (x, y, z) = (5, 0, 0)
 選單命令GameObject>3D Object>Plane
 Position (x, y, z) = (0, -1, 0)
 選單命令GameObject>3D Object>Sphere
 Position (x, y, z) = (0, 0, 0)
 Scale (x, y, z) = (2, 2, 2)
光源設定練習 1/3
15 Wu, ShyiShiou Dept. of E.E., NKUT

16. shapethefuture
 選單命令GameObject>Light>Point Light
 Position (x, y, z) = (4, 3, 0)
 Color = red
 選單命令GameObject>Light>Spotlight
 Position (x, y, z) = (4, 4, 0)
 Rotation (x, y, z) = (125, -90, 0)
 Spot Angle = 50
 Intensity = 2
 Shadow Type = Soft Shadows
光源設定練習2/3
16 Wu, ShyiShiou Dept. of E.E., NKUT

17. shapethefuture
 測試結果
光源設定練習3/3
17 Wu, ShyiShiou Dept. of E.E., NKUT

18. shapethefuture
 新增場景，檔名Flare
 Directional Light
 Intensity = 0.3
 Flare = Sun
 Main Camera
 Position (x, y ,z) = (0, 2, -9)
 Rotation (x, y, z) = (5, 0, 0)
 選單命令GameObject>3D Object>Plane
 Position (x, y, z) = (0, -1, 0)
 選單命令GameObject>3D Object>Sphere
 Position (x, y, z) = (0, 0, 0)
 Scale (x, y, z) = (2, 2, 2)
眩光效果練習 1/4
18 Wu, ShyiShiou Dept. of E.E., NKUT

19. shapethefuture
 選單命令GameObject>Light>Point Light
 Position (x, y, z) = (4, 3, 0)
 Color = red
 Flare = 50mmZoom
 選單命令GameObject>Light>Spotlight
 Position (x, y, z) = (4, 4, 0)
 Rotation (x, y, z) = (125, -90, 0)
 Spot Angle = 50
 Intensity = 2
 Shadow Type = Soft Shadows
 Flare = FlareSmall
眩光效果練習 2/4
19 Wu, ShyiShiou Dept. of E.E., NKUT

20. shapethefuture
 Main Camera加入腳本程式
public class CameraControl : MonoBehaviour {
public float x;
public float y;
public float xSpeed = 1;
public float ySpeed = 1;
private Quaternion rotationEuler;
void LateUpdate()
{
x += Input.GetAxis ("Mouse X") * xSpeed ;
y -= Input.GetAxis ("Mouse Y") * xSpeed ;
rotationEuler = Quaternion.Euler (y, x, 0);
transform.rotation = rotationEuler;
}
}
眩光效果練習 3/4
20 Wu, ShyiShiou Dept. of E.E., NKUT

21. shapethefuture
 測試結果
眩光效果練習 4/4
21 Wu, ShyiShiou Dept. of E.E., NKUT

22. shapethefuture
 光影貼圖是⼀種增加靜態場景光照效果的技術
 事先將光影效果經由計算產生貼圖，渲染到場景中的靜態物件，減
少遊戲執行階段的燈光照明計算，在遊戲執行時以較少的處理器資
源就能使靜態場景看起來更真實
光影貼圖
22 Wu, ShyiShiou Dept. of E.E., NKUT

23. shapethefuture
 場景物件
光影貼圖練習 1/7
23 Wu, ShyiShiou Dept. of E.E., NKUT
Sphere
Plane
Area Light - Left
Area Light - Middle
Area Light - Right
Directional Light

24. shapethefuture
光影貼圖練習 2/7
24 Wu, ShyiShiou Dept. of E.E., NKUT
光影貼圖前
光影貼圖後
光影貼圖後(關閉方向光源)

25. shapethefuture
 新增場景，檔名Light baking
 Directional Light
 Rotation (x, y, z) = (50, -30, 0)
 Intensity = 0.4
 Main Camera
 Position (x, y ,z) = (0, 4, -10)
 Rotation (x, y, z) = (12, 0, 0)
光影貼圖練習 3/7
25 Wu, ShyiShiou Dept. of E.E., NKUT

26. shapethefuture
 選單命令GameObject>3D Object>Sphere
 Position (x, y, z) = (0, 1.5, 0)
 Scale (x, y, z) = (3, 3, 3)
 選單命令GameObject>3D Object>Plane
 Position (x, y, z) = (0, 0, 0)
 Scale (x, y, z) = (1, 1, 1)
 選單命令GameObject>Light>Area Light
 Position (x, y, z) = (5, 2, -3)
 Rotation (x, y, z) = (0, 0, 0)
 Width=5, Height=5
 Color = Red
光影貼圖練習 4/7
26 Wu, ShyiShiou Dept. of E.E., NKUT

27. shapethefuture
 選單命令GameObject>Light>Area Light
 Position (x, y, z) = (0, 2, -3)
 Rotation (x, y, z) = (0, 0, 0)
 Width=5, Height=5
 Color = Green
 選單命令GameObject>Light>Area Light
 Position (x, y, z) = (-5, 2, -3)
 Rotation (x, y, z) = (0, 0, 0)
 Width=5, Height=5
 Color = Blue
光影貼圖練習 5/7
27 Wu, ShyiShiou Dept. of E.E., NKUT

28. shapethefuture
 將要烘焙的物件 (Shpere及Plane) 設定為Static
 將要加入光影貼圖運算的光源Baking屬性設定為Baked
光影貼圖練習 6/7
28 Wu, ShyiShiou Dept. of E.E., NKUT

29. shapethefuture
 選單命令Window>Lighting
 取消勾選Auto
 點擊Build按鈕
光影貼圖練習 7/7
29 Wu, ShyiShiou Dept. of E.E., NKUT