Distance Joint, Fixed Joint, Friction Joint, Hinge Joint, Relative Joint, Slider Joint, Spring Joint, Target Joint, Wheel Joint

1. 2D 物理關節應用
Revised on December 25, 2019
 Distance Joint
 Fixed Joint
 Friction Joint
 Hinge Joint
 Relative Joint
 Slider Joint
 Spring Joint
 Target Joint
 Wheel Joint
 綜合應用

2.  https://docs.unity3d.com/Manual/Joints2D.html
 物理關節用來將遊戲物件與另⼀遊戲物件或場景空間的固定位置建
立物理連結
2D Joints 1/3
2
 適合用來建構場景上的機關陷阱
 套用Joint 2D之物件會自動加上
Rigidbody 2D性質

3.  選單命令Component> Physical 2D子選單，可加入2D Joints元件
 距離關節 (Distance Joint 2D)
將兩個物體以固定相對距離方式連接
 固定關節 (Fixed Joint 2D)
使兩個物件維持固定的相對位置及角度，很類似階層裡的父子結構
 摩擦關節 (Friction Joint 2D)
在相連的兩個遊戲物件間加上摩擦力，使移動物件的直線速度及角速度減
慢至停止
 樞紐關節 (Hinge Joint 2D)
將剛體物件附接到它可以旋轉的⽀點。例如：⼀把剪⼑的樞軸，⾨旋轉軸
2D Joints 2/3
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4.  相對關節 (Relative Joint 2D)
將兩個剛體遊戲物件彼此保持在相同的相對位置。使用此關節可保持兩個
物體相互偏移。例如：在射擊遊戲中，玩家有額外的槍電池跟隨他們
 滑塊關節 (Slider Joint 2D)
限制遊戲物件沿著空間中的直線路徑滑動，例如滑動⾨
 彈簧關節 (Spring Joint 2D)
將兩個剛體遊戲物件好像通過彈簧連接在⼀起
 目標關節 (Target Joint 2D)
類似相對關節，但連結具有彈性，用來利用回彈力將物體回到目標位置。
可用於拾取和移動例如在重力作用下的物體
 車輪接頭 (Wheel Joint 2D)
模擬車輪和懸架
2D Joints 3/3
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5.  距離關節可讓遊戲物件與定點或另⼀物件之間維持固定距離
Distance Joint 2D 1/4
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Distance Joint 2D

6.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
Distance Joint所要連接的另⼀物件，None表示要連接到世界座標
的定點(預設為原點)
 Auto Configure Connected Anchor
勾選時，會自動調整關節所連接物件之⽀點(Connected Anchor值)
 Anchor
關節⽀點座標(以圖片pivot為原點)，預設值為物件中心點，也允許
於設在物件外部
 Connected Anchor
關節在另⼀個物件的⽀點
Distance Joint 2D 2/4
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Anchor
Connected Anchor
Distance Joint 2D

7.  Auto Configure Distance
自動調整關節距離(Distance值)，預設為勾選
 Distance
Anchor到Connected Anchor之距離
 Max Distance Only
只限制最大距離，連接的物件仍可彼此靠近，但不能超過Distance欄
設定值。若未勾選，則連接的兩物件永遠保持固定距離
Distance Joint 2D 3/4
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8.  Break Force
 斷開關節所需的最小力量，預設值為infinite
 當關節的reactionForce值(只能在程式腳本讀取)高於breakForce，或
reactionTorque值(只能在程式腳本讀取)高於關節的breakTorque時，
關節將斷裂
 當關節斷裂時，系統會執行OnJointBreak2D事件程序，並且傳入
Joint2D。完成OnJointBreak2D事件程序後，關節將自動從遊戲物件中
移除並刪除
Distance Joint 2D 4/4
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9.  將Sprites/ball加入到場景
 Position(X, Y, Z) = (-3, -3, 0)
 Scale(X, Y) = (0.5, 0.5)
 在ball物件加入Distance Joint 2D元件
 選單命令Component> Physics 2D> Distance Joint 2D
 取消勾選Auto Configure Distance
 執行測試，ball會以場景中心為⽀點擺盪
Distance Joint 2D練習 1/3
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rope end
Anchor of
Distance Joint 2D
Distance Joint 2D
Connected Anchor of
Distance Joint 2D

10.  將Sprite/rope end加入到場景
 Position(X, Y, Z) = (-1, 0, 0)
 在rope end物件加入運動剛體元件
 選單命令Component> Physics 2D> Rigidbody 2D
 Body Type = Kinematic
 將rope end物件拖曳到ball之Distance Joint 2D的Connected
Rigid Body屬性欄
 執行測試，ball會以rope end為⽀點擺盪
Distance Joint 2D練習 2/3
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rope end
Distance Joint 2D
ball
Connected Rigid Body

11.  將ball移到rope end上方
 Position(X, Y, Z) = (3, -3, 0)
 勾選ball之Distance Joint 2D的Max Distance Only
 執行測試，觀察ball運動情形
 反覆調整ball之Distance Joint 2D的Break Force值，執行測試，
觀察ball運動情形
Distance Joint 2D練習 3/3
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rope end
Distance Joint 2D
ball
Connected Rigid Body

12.  固定關節用來將2個物件以軸承方式連接在⼀起
Fixed Joint 2D 1/3
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Fixed Joint 2D
Fixed Joint 2D

13.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀物件，None表示要連接到世界座標的定點
 Auto Configure Connected Anchor
自動調整關節所連接物件之⽀點(Connected Anchor值)
 Anchor
關節⽀點，預設值為物件中心點，也允許於設在物件外部
 Connected Anchor
關節在另⼀個物件的⽀點
Fixed Joint 2D 2/3
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14.  Damping Ratio
阻尼比，0.0~1.0之間。阻尼比愈大，物件受力振動後愈快回復原狀
 Frequency
物件振動頻率，0~1,000,000之間，數值愈大，物件愈不易來回振動
(0表示完全不振動)
 Break Force
斷開關節所需的最小力道
 Break Torque
斷開關節所需的最小扭力
Fixed Joint 2D 3/3
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15.  將Sprites/ball加到場景
 Scale(X, Y, Z) = (0.5, 0.5, 1)
 Position(X, Y, Z) = (-1.5, 3, 0)
 在ball物件加入Rigidbody 2D元件
 選單命令Component> Physics 2D> Rigidbody 2D
 在ball物件加入Circle Collider 2D元件
 選單命令Component> Physics 2D> Circle Collider 2D
 將Sprites/plank加到場景，命名為plank a
 Position(X, Y, Z) = (0, 0, 0)
 將Sprites/plank加到場景，命名為plank b
 Position(X, Y, Z) = (-2, -2, 0)
Fixed Joint 2D練習 1/2
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16.  在plank a物件加入Box Collider 2D元件
 在plank a物件加入Fixed Joint 2D元件
 Anchor(X, Y) = (1.35, 0)
 Connected Anchor(X, Y) = (1.35, 0)
 Frequency = 5
 在plank b物件加入Box Collider 2D元件
 在plank b物件加入Fixed Joint 2D元件
 Anchor(X, Y) = (0, 0)
 Connected Anchor(X, Y) = (-2, -2)
 Frequency = 0.1
 執行測試，觀察ball掉落運動情形；調整Frequency及Damping
Ratio，觀察plank振動情形
Fixed Joint 2D練習 2/2
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ball
ball
Anchor of Fixed Joint 2D
plank a
plank b
Anchor of Fixed Joint 2D

17.  摩擦關節來在運動物件加上線摩擦力和角摩擦力
Friction Joint 2D 1/3
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Distance Joint 2D
Friction Joint 2D

18.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀物件，None表示要連接到世界座標的定點
 Auto Configure Connected Anchor
自動調整關節所連接物件之⽀點(Connected Anchor值)
 Anchor
關節⽀點，預設為物件中心點，也允許於設在物件外部
 Connected Anchor
關節在另⼀個物件的⽀點
Friction Joint 2D 2/3
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19.  Max Force
設定直線移動摩擦力，預設值為1
 Max Torque
設置旋轉摩擦力，預設值為1
 Break Force
斷開關節所需的最小力道
 Break Torque
斷開關節所需的最小扭力
Friction Joint 2D 3/3
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upper plank

20.  將Sprites/ball加入到場景
 Position(X, Y, Z) = (-3, -1, 0)
 Scale(X, Y) = (0.5, 0.5)
 在ball物件加入Distance Joint 2D元件
 選單命令Component> Physics 2D> Distance Joint 2D
 執行測試，ball會以場景中心為⽀點擺盪
 在ball物件加入Friction Joint 2D
 取消勾選Auto Configure Connected Anchor
 Max Force = 0.5，Max Torque = 0.5
 Connected Anchor(X, Y) = (0, -4)
 執行測試，ball是否較快停止擺盪
Friction Joint 2D練習
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Distance Joint 2D
Friction Joint 2D
Connected Anchor
Connected Anchor

21.  樞紐關節可讓物件繞著轉軸旋轉
Hinge Joint 2D 1/3
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Distance Joint 2DHinge Joint 2D

22.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀剛體物件，None表示要連接到世界座標的定點
 Auto Configure Connected Anchor
自動調整關節所連接到的物件之⽀點(Connected Anchor值)
 Anchor
剛體物體的旋轉點
 Connected Anchor
剛體物體的旋轉點所附著的位置
Hinge Joint 2D 2/3
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23.  Use Motor 勾選表示在樞紐關節加上馬達動力
 Motor Speed
馬達速度，角度值/每秒，負值為逆時針
 Maximum Motor Force
馬達最大扭力
 Use Limits 勾選表示在樞紐關節加上旋轉角度限制
 Lower Angle
樞紐旋轉角度下限(以Anchor為圓心)
 Upper Angle
樞紐旋轉角度上限(以Anchor為圓心)
Hinge Joint 2D 3/3
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Anchor
Upper Angle
Lower Angle

24.  將Sprites/ball加到場景
 Scale(X, Y, Z) = (0.5, 0.5, 1)
 Position(X, Y, Z) = (-2, 3, 0)
 加入Circle Collider 2D元件
 選單命令Component> Physics 2D> Circle Collider 2D
 加入Distance Joint 2D元件
 選單命令Component> Physics 2D> Distance Joint 2D
 將Sprites/plank加到場景
 Position(X, Y, Z) = (-5, 0, 0)
 加入Box Collider 2D
Hinge Joint 2D練習 1/2
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25.  在plank加上Hinge Joint 2D元件
 Anchor(X, Y) = (-1, 0)
 Connected Anchor = (-6, 0)
 勾選Use Motor
 Motor Speed：-30
 Maximum Motor Force：15
 勾選Use Limits
 Lower Angle：0
 Upper Angle：45
 執行測試，觀察plank活動情形
Hinge Joint 2D練習 2/2
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Upper Angle
Lower Angle
Distance Joint 2D
Anchor of Hinge
Jointer 2D

26.  使用Hinge Joint 2D建立鏈條
Hinge Joint 2D練習II 1/2
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27. Hinge Joint 2D練習II 2/2
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28.  使兩個物件間保持在⼀定的相對位置。例如，寵物自動跟隨玩家
Relative Joint 2D 1/3
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29.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀剛體物件，None表示要連接到世界座標的定點
 Max Force
關節連接力道，愈大值表示兩物件愈牢牢連接
 Max Torque
關節連接扭力，愈大值表示兩物件愈牢牢連接
Relative Joint 2D 2/3
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30.  Correction Scale
修正相對位置所施加的力道大小，0.0~1.0之間，預設值為0.3。力道
愈大，修正相對位置時擺盪情形愈明顯
 Auto Configure Offset
自動調整關節所連接到的物件之距離偏移(Linear Offset)及角度偏
移(Angular Offset)
 Linear Offset
與關節所連接物件之距離偏移值
 Angular Offset
與關節所連接物件之角度偏移值
Relative Joint 2D 3/3
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31.  將Sprites/plank加到場景
 Position (X, Y, Z)=(0, -3.5, 0)
 Rotation (X, Y, Z)=(0, 0, -4)
 Scale (X, Y, Z)=(4, 1, 1)
 加入Box Collider 2D
 選單命令Component> Physics 2D> Box Collider 2D
 將Sprites/ball加入到場景
 Position(X, Y, Z) = (-4, 1, 0)
 Scale(X, Y, Z) = (0.3, 0.3, 1)
 加入Rigidbody 2D
 選單命令Component> Physics 2D> Rigidbody 2D
Relative Joint 2D練習 1/2
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32.  將Sprites/ball加到場景，命名為ring
 Position (X, Y, Z) = (-4, 2, 0)
 Scale (X, Y, Z) = (0.15, 0.15, 1)
 加入Circle Collider 2D元件
 加入Realtive Joint 2D元件
 Connected Rigid Body = ball
 Max Force=100
 Correction Scale = 0.1
 勾選Auto Configure Offset
 複製7個ring物件，環繞ball成圓形
 執行測試，觀察ball及ring活動情形
Relative Joint 2D練習 2/2
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33.  可讓物體回應於碰撞或施力而滑動，例如滑動⾨
Slider Joint 2D 1/5
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Distance Joint 2D
Slider Joint 2D

34.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀剛體物件，None表示要連接到世界座標的定點
 Auto Configure Connected Anchor
自動調整關節所連接到的物件之⽀點(Connected Anchor值)
 Anchor
關節⽀點，預設值為物件中心點，也允許於設在物件外部
 Connected Anchor
關節連接到場景上的⽀點
Slider Joint 2D 2/5
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35.  Auto Configure Angle
自動調整與關節所連接物件之角度值(Angle)
 Angle
與關節所連接物件之角度值
 Use Motor 勾選表示在關節施加馬達動力
 Motor Speed
馬達速度 (公尺/秒)，正值朝Lower Translation方向移動，負值朝
Upper Translation方向移動
 Maximum Motor Force
馬達最大力道
Slider Joint 2D 3/5
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36.  Use Limits 勾選表示啟用關節滑動距離限制
 Lower Translation
滑動時Connected Anchor的下邊界位置(以Anchor值為原點)
 Upper Translation
滑動時Connected Anchor的上邊界位置(以Anchor值為原點)
 Break Force
斷裂力道，破壞關節所需的最小力量
 Break Torque
斷裂扭力，破壞關節所需的最小扭力
Slider Joint 2D 4/5
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37. Slider Joint 2D 5/5
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當Motor speed為正值時
當Motor speed為負值時
Lower
Translation
Upper
Translation
Connected Anchor
Connected Anchor
Connected Anchor

38.  將Sprites/ball加到場景
 Scale(X, Y, Z) = (0.3, 0.3, 1)
 Position(X, Y, Z) = (-1.414, 1.414, 0)
 加入Circle Collider 2D元件
 選單命令Component> Physics 2D> Circle Collider 2D
 加入Distance Joint 2D元件
 選單命令Component> Physics 2D> Distance Joint 2D
 Break Force = 50
 將Sprites/plank加到場景
 Position(X, Y, Z) = (1.5, -2, 0)
 加入Box Collider 2D
Slider Joint 2D練習 1/2
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39.  在plank物件加入Slider Joint 2D
 取消勾選Auto Configure Connected Anchor
 Anchor(X, Y) = (0, 0)
 Connected Anchor(X, Y) = (0, -2)
 Angle = 180
 勾選Use Motor
 Motor Speed：-1，Maximum Motor Force：2
 勾選Use Limits
 Lower Translation：1.5
 Upper Translation：4.5
 執行測試，觀察plank活動情形
Slider Joint 2D練習 2/2
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Upper
Translation
Connected Anchor
AnchorLower
Translatio
n
Distance Joint 2D

40.  彈簧關節將物件如同透過彈簧連接在⼀起
Spring Joint 2D 1/3
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Spring Joint 2D

41.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀剛體物件，None表示要連接到世界座標的定點
 Auto Configure Connected Anchor
自動調整關節所連接到的物件之⽀點(Connected Anchor值)
 Anchor
關節⽀點，預設值為物件中心點，也允許於設在物件外部
 Connected Anchor
關節在另⼀個物件的⽀點
Spring Joint 2D 2/3
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42.  Auto Configure Distance
自動調整Distance值。要有彈簧效果，不可勾選此項
 Distance
彈簧⻑度
 Damping Ratio
阻尼比，0.0~1.0之間。阻尼比愈大，彈簧愈快回復靜止狀態
 Frequency
彈簧振動的頻率，0~1,000,000之間，值愈大，表示彈簧愈硬
Spring Joint 2D 3/3
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43.  將Sprites/plank加到場景
 Position(X, Y, Z) = (0, 3, 0)
 加入Rigidbody 2D
 Body Type = Kinematic
 將Sprites/ball加到場景
 Position(X, Y, Z) = (0, -2, 0)
 Scale(X, Y, Z) = (0.4, 04, 0)
 加入Spring Joint 2D
 Connected Rigid Body = plank
 取消勾選Auto Configure Distance
 執行測試，使用滑鼠拖曳ball再放開，觀察ball擺盪情形
Spring Joint 2D練習
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Connected Rigid Body
Spring Joint 2D
Distance
Anchor

44.  是⼀種近似彈簧關節，利用回彈力讓物體返回定點
Target Joint 2D 1/3
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45.  Anchor
關節⽀點，預設值為物件中心點，也允許於設在物件外部
 Target
物體的目標點
 Auto Configure Target
自動調整Target值
 Max Force
朝向目標點移動的力道
 Damping Ratio
阻尼比，0.0~1.0之間，阻尼比愈大表示來回運動次數愈少
Target Joint 2D 2/3
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46.  Frequency
振動的頻率，0~1,000,000之間，值愈大，表示彈簧愈硬
 Break Force
斷裂力道，破壞關節所需的最小力量
Target Joint 2D 3/3
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47.  將Sprites/ball加到場景
 Position (X, Y, Z) = (-7.5, 4, 0)
 Scale (X, Y, Z) = (0.4, 0.4, 1)
 加入Rigidbody 2D
 加入Circle Collider 2D
 將Sprites/plank加到場景
 Position (X, Y, Z) = (-8, 2, 0)
 Rotation (X, Y, Z) = (0, 0, -1)
 Scale (X, Y, Z) = (0.6, 1, 1)
 加入Rigidbody 2D
 勾選Freeze Rotation Z
 加入Box Collider 2D
Target Joint 2D練習 1/2
47

48.  加入Target Joint 2D
 勾選Auto Configure Target
 Max Force = 30
 Damping Ratio = 0.1
 Frequency = 3
 複製6個plank物件，排列成階梯狀；執行測試，觀察執行結果
Target Joint 2D練習 2/2
48

49.  車輪關節用來模擬滾動輪，車輪關節可加上動力，使車輪關節上的物
體移動。車輪關節使用懸吊"彈簧"來保持其與車輛主體的距離
Wheel Joint 2D 1/3
49

50.  Enable Collision
啟用關節所連接的兩個物件間的碰撞偵測
 Connected Rigid Body
關節所要連接的另⼀剛體物件，None表示要連接到世界座標的定點
 Auto Configure Connected Anchor
自動調整關節所連接到的物件之⽀點(Connected Anchor值)
 Anchor
關節⽀點，預設值為物件中心點，也允許於設在物件外部
 Connected Anchor
關節在另⼀個物件的⽀點
Wheel Joint 2D 2/3
50

51.  Suspension 車輪懸吊系統設定
 Damping Ratio
阻尼比，0.0~1.0之間，阻尼比愈大表示彈簧來回運動次數愈少
 Frequency
彈簧振動的頻率，0~1,000,000之間，值愈大，表示彈簧愈硬
 Angle
彈簧懸吊角度
 Use Motor 施加馬達動力
 Motor Speed
馬達速度 (角度值/秒)
 Maximum Motor Force
馬達最大力道
Wheel Joint 2D 3/3
51

52.  將Sprites/plank加到場景
 Position(X, Y, Z) = (-7.5, 0, 0)
 加入Rigidbody 2D
 將Sprites/car wheel加到場景
 Position(X, Y, Z) = (-8.5, -1.2, 0)
 Scale(X, Y, Z) = (0.5, 0.5, 1)
 加入Wheel Joint 2D
 Connected Rigid Body = plank
 取消勾選Auto Configure Connected Anchor
 Anchor(X, Y) = (0, 0)
 Connected Anchor(X, Y) = (-1, -1.25)
Wheel Joint 2D練習 1/2
52

53.  勾選Use Motor
 Motor Speed = 10
 加入Circle Collider 2D
 複製car wheel
 Position(X, Y, Z) = (-6.5, -1.25, 0)
 Wheel Joint 2D
 Connected Anchor(X, Y) = (1, -1.25)
 將Sprites/plank加到場景
 Position(X, Y, Z) = (0, -3, 0)
 Scale(X, Y, Z) = (7, 1, 1)
 加入Box Collider 2D
Wheel Joint 2D練習 2/2
53

54. 2D Joint應用練習
54

55.  設定Main Camera
 Size = 10
 將background加入場景
 Position(X, Y, Z) = (0, 0, 0)
 Scale(X, Y, Z) = (5, 5, 1)
 Order in Layer = -1
建置場景 1/2
55

56.  在background加入Edge Collider 2D
 Edge Radius = 0.1
 編輯Edge Collier線段，使其符合背景地形
建置場景 2/2
56
Edge Collider 2D

57.  將car body加到場景，命名為truck
 重置Transform
 Order in Layer = 1
 tag = Player
 將suspension加到場景，命名為front suspension
 Position(X, Y, Z) = (3.77, -0.3, 0)
 Scale(X, Y, Z) = (1.5, 1, 1)
 Order in Layer = 2
 將suspension加到場景，命名為rear suspension
 Position(X, Y, Z) = (-3.25, -0.3, 0)
 Scale(X, Y, Z) = (1.5, 1, 1)
 Order in Layer = 2
組合卡車 1/3
57

58.  將car wheel加到場景，命名為front wheel
 Position(X, Y, Z) = (3.82, -1.85, 0)
 Scale(X, Y, Z) = (1.3, 1.3, 1)
 Order in Layer = 3
 將car wheel加到場景，命名為rear wheel
 Position(X, Y, Z) = (-3.28, -1.9, 0)
 Scale(X, Y, Z) = (1.3, 1.3, 1)
 Order in Layer = 3
組合卡車 2/3
58

59.  將front suspension、rear suspension、front wheel及rear
wheel拖曳成為turck子物件
 調整turck尺寸
 Scale(X, Y, Z) = (0.7, 0.7, 1)
組合卡車 3/3
59

60.  truck加入Rigidbody 2D
 取消勾選Use Auto Mass
 Mass = 5
 truck加入Polygon Collider 2D
 編輯Polygon Collider，僅量用較少的端點
來覆蓋車體外形
 保留點數最多的Element
 ctrl-click刪除端點
設置卡車碰撞器 1/2
60
Circle Collider 2D
Edge Collider 2D

61.  在front wheel及rear wheel加入Circle Collider 2D
設置卡車碰撞器 2/2
61

62.  front wheel加入Wheel Joint 2D
 Connected Rigid Body = truck
 取消勾選Auto Configure Connected Anchor
 Connected Anchor(X, Y) = (3.82, -1.85)
 Suspension/Damping Ratio = 0.7、Frequency = 10、Angle = 90
 勾選Use Motor
 Moter/Motor Speed = 600、Maximum Motor Force = 1000
 Ririgbody 2D
 勾選Use Auto Mass
設置Wheel Joint 2D 1/3
62

63.  rear wheel加入Wheel Joint 2D
 Connected Rigid Body = truck
 取消勾選Auto Configure Connected Anchor
 Connected Anchor(X, Y) = (-3.28, -1.9)
 Suspension/Damping Ratio = 0.7、Frequency = 10、Angle = 90
 勾選Use Motor
 Moter/Motor Speed = 500、Maximum Motor Force = 1000
 Ririgbody 2D
 勾選Use Auto Mass
設置Wheel Joint 2D 2/3
63

64.  調整truck到場景左側
 Position(X, Y, Z) = (-45, 0, 0)
 調整Main Camera位置
 Position(X, Y, Z) = (-30.5, 0, 0)
 測試遊戲，車子會跑出螢幕!!!
設置Wheel Joint 2D 3/3
64

65.  在Main Camera新增CameraControl程式腳本
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CameraControl : MonoBehaviour {
public float xMargin = 1f; //攝影機啟動跟隨前允許玩家移動的水平位移
public float xSmooth = 2f; //使相機平穩地捕捉目標運動之X軸修正值
public float maxX; //攝影機位置X最大值
public float minX; //攝影機位置X最小值
private Transform player; //玩家角色transform屬性
void Awake () {
player = GameObject.FindGameObjectWithTag("Player").transform;
}
void FixedUpdate () {
TrackPlayer();
}
攝影機追隨功能 1/2
65

66. bool CheckXMargin () {
return Mathf.Abs(transform.position.x - player.position.x) > xMargin;
}
void TrackPlayer () {
float targetX = transform.position.x;
if (CheckXMargin())
targetX = Mathf.Lerp(transform.position.x, player.position.x,
xSmooth * Time.deltaTime);
targetX = Mathf.Clamp(targetX, minX, maxX);
transform.position = new Vector3(targetX,0, transform.position.z);
}
}
 設定Main Camera之Camera Control
 Max X = 29.5，Min X = -29
 測試遊戲，攝影機會追踨車子移動
攝影機追隨功能 2/2
66

67.  拖曳Assets/Sprites/ChainLinksSprite_0.png場景
 Position(X, Y, Z) = (31.72, -2.68)
 Rotation(X, Y, Z) = (0, 0, 97)
 加入Capsule Collider 2D
 加入Hinge Joint 2D
 取消勾選Auto Configure Connected Anchor
 Anchor(X, Y) = (0, 0.22)
 Connected Anchor(X, Y) = (31.5, -2.7)
使用Hinge Joint 2D建立鏈橋 1/9
67

68.  拖曳Assets/Sprites/ChainLinksSprite_1.png場景
 Position(X, Y, Z) = (32.5, -2.58)
 Rotation(X, Y, Z) = (0, 0, 97)
 Order in Layer = 1
 加入Capsule Collider 2D
 加入Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_0
 取消勾選Auto Configure Connected Anchor
 Anchor(X, Y) = (0, 0.34)
 Connected Anchor(X, Y) = (0, -0.43)
使用Hinge Joint 2D建立鏈橋 2/9
68

69.  Ctrl-D複製ChainLinksSprite_0
 Position(X, Y, Z) = (32.28, -2.49)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_1
 Anchor(X, Y) = (0, 0.37)
 Connected Anchor(X, Y) = (0, -0.4152)
 Ctrl-D複製ChainLinksSprite_1
 Position(X, Y, Z) = (34.03, -2.41)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_0(1)
使用Hinge Joint 2D建立鏈橋 3/9
69

70.  Ctrl-D複製ChainLinksSprite_0(1)
 Position(X, Y, Z) = (34.8, -2.31)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_1(1)
 Ctrl-D複製ChainLinksSprite_1(1)
 Position(X, Y, Z) = (35.56, -2.21)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_0(2)
使用Hinge Joint 2D建立鏈橋 4/9
70

71.  Ctrl-D複製ChainLinksSprite_0(2)
 Position(X, Y, Z) = (36.36, -2.12)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_1(2)
 Ctrl-D複製ChainLinksSprite_1(2)
 Position(X, Y, Z) = (37.13, -2.03)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_0(3)
使用Hinge Joint 2D建立鏈橋 5/9
71

72.  Ctrl-D複製ChainLinksSprite_0(3)
 Position(X, Y, Z) = (37.89, -1.93)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_1(3)
 Ctrl-D複製ChainLinksSprite_1(3)
 Position(X, Y, Z) = (38.67, -1.84)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_0(4)
使用Hinge Joint 2D建立鏈橋 6/9
72

73.  Ctrl-D複製ChainLinksSprite_0(4)
 Position(X, Y, Z) = (39.45, -1.76)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_1(4)
 移除Capsule Collider 2D
 Ctrl-D複製ChainLinksSprite_1(4)
 Position(X, Y, Z) = (40.21, -1.67)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_0(5)
 移除Capsule Collider 2D
使用Hinge Joint 2D建立鏈橋 7/9
73

74.  Ctrl-D複製ChainLinksSprite_0(5)
 Position(X, Y, Z) = (40.99, -1.58)
 Hinge Joint 2D
 Connected Rigid Body = ChainLinksSprite_1(5)
 移除Capsule Collider 2D
 加入Hinge Joint 2D
 取消勾選Auto Configure Connected Anchor
 Anchor(X, Y) = (0, -0.33)
 Connected Anchor(X, Y) = (41.32, -1.53)
使用Hinge Joint 2D建立鏈橋 8/9
74

75.  選單命令GameObject> Create Emepty，命名為Cable bridge
 重置Transform
 拖曳全部的ChainLinksSprite_XX成為Cable bridge之子物件
 測試遊戲
使用Hinge Joint 2D建立鏈橋 9/9
75