106 lines
4.4 KiB
Markdown
106 lines
4.4 KiB
Markdown
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---
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title: Exploring the Gameplay Ability System (GAS) with an Action RPG Unreal Fest 2022学习笔记
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date: 2022-11-10 21:04:35
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excerpt:
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tags: GAS
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rating: ⭐
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---
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## 前言
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原视频：[Exploring the Gameplay Ability System (GAS) with an Action RPG Unreal Fest 2022](https://www.youtube.com/watch?v=tc542u36JR0&t)
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## InitialSetup
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首先需要考虑：
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- 哪些`AttributeSets`需要创建
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- 如何让角色获取`GrantAbility`
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- 如何绑定按键与控制器输出事件
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## CharacterSetup
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- 继承并实现`IAbilitySystemInterface`
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- 挂载ASC，但一般还是挂载到PlayerState上。
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- 在构造函数中创建默认子物体：
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- AbilitySystemComponent
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- AttributeSetObject
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### PossessedBy
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- AbilitySystemComponent->InitAbilityActorInfo(AActor* InOwnerActor, AActor* InAvatarActor)
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- InitializeAttributes
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- Listen for tags of interest(via UAsyncATaskGameplayTagAddedRemoved)
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- Add start-up effects
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- Bind to Ability activation failed callback
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### BeginPlay
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Listen to Health Attribute change
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Bind to ASC->OnImmunity
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## AttributeSets
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- PrimaryAttributes——核心RPG状态，绝大多数实体需要
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- Health,MaxHealth,Shields,MaxShields,Stamina
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- Core RPG Style values（比如Strength，Fortitude（坚韧）等）
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- SecondaryAttributes——一定深度的RPG状态，非所有实体需要
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- Elemental resistances（元素抵抗表）,Elemental bonuses（元素奖励）,Current Elemental build-Ups（当前元素构建方式）
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- TertiaryAttributes——Bounses（主要用于玩家控制的角色）
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- Interaction speed bonuses,other specific bonuses and stats
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- Weapon archetype specific Attribute（武器相关属性）
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- Charge Percent（充能百分比）,Spread（扩散）,Charge Count（充能次数）
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### 后续改进
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- PrimaryAttributes
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- 将Health等基本属性分割成自己的属性集
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- 目前，如果我们给一个UObject等设置了一个属性集来跟踪它们的Health，但它们也会保存其他不必要的值。
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- SecondaryAttributes
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- 对这个设计很满意，因为它都是与元素有关的状态，以及buff/debuff属性。
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- TertiaryAttributes
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- 一些属性可以被分割合并到实体特化的属性集中。
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- Weapon archetype specific attributes
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- 一些int类型的Attribute可以使用Stackable GE来代替（属性集只有float类型），通过查询堆栈数目来获取数据。
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## 演讲者团队增加的额外功能
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- UGameplayAbility
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- Input
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- UInputAction InputAction(Enhanced Input System)
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- Custom Ability Input ID Enum
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- Booleans/Bitfields 开启一些核心功能 ，我们不想对所有Ability增加通过GameplayTags实现的功能
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- Activate On Granted
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- Activate On Input
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- Can Activate Whilst Interacting
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- Cannot Activate Whilst Stunned
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- Cached Owning Character
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- AsyncAbilityTasks
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- Attribute Changed
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- Cooldown Changed
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- GameplayTag Added Removed
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- Wait GE Class Added Removed
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## 使用DataTable与C++来初始化属性集
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或者就是实现一个结构体基于FAttributeSetIniDiscreteLevel。
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## 创建自定义节点来传递GE计算结果与Tags
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多次GE的积累计算结果。主要是通过AbilitySystemGlobals来实现
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- GE_Damage
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- Custom Calculation Class：C++ Damage Execution Calculation
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- Conditional GEs
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- GE_BuildUp_Stun
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- Custom Calculation Class: C++ Build Up Calculation
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- Conditional GE: GE_Stunned
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- GE_BuildUp_Burn
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- Custom Calculation Class: C++ Build Up Calculation
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- Conditional GE: GE_Burned
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## 装备属性变化
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## AbilityTraitsTableExample
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## 该团队AbilityEntitySystem设计
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用来实现子弹变量、AOE、Cnnstruct、角色等带有ASC的实体。
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