# GASDocumentation
My understanding of Unreal Engine 5's GameplayAbilitySystem plugin (GAS) with a simple multiplayer sample project. This is not official documentation and neither this project nor myself are affiliated with Epic Games. I make no guarantee for the accuracy of this information.
The goal of this documentation is to explain the major concepts and classes in GAS and provide some additional commentary based on my experience with it. There is a lot of 'tribal knowledge' of GAS among users in the community and I aim to share all of mine here.
The Sample Project and documentation are current with **Unreal Engine 5.1**. There are branches of this documentation for older versions of Unreal Engine, but they are no longer supported and are liable to have bugs or out of date information.
[GASShooter](https://github.com/tranek/GASShooter) is a sister Sample Project demonstrating advanced techniques with GAS for a multiplayer FPS/TPS.
The best documentation will always be the plugin source code.
<a name="table-of-contents"></a>
## Table of Contents
> 1. [Intro to the GameplayAbilitySystem Plugin](#intro)
> 1. [Sample Project](#sp)
> 1. [Setting Up a Project Using GAS](#setup)
> 1. [Concepts](#concepts)
> 4.1 [Ability System Component](#concepts-asc)
> 4.1.1 [Replication Mode](#concepts-asc-rm)
> 4.1.2 [Setup and Initialization](#concepts-asc-setup)
> 4.2 [Gameplay Tags](#concepts-gt)
> 4.2.1 [Responding to Changes in Gameplay Tags](#concepts-gt-change)
> 4.3 [Attributes](#concepts-a)
> 4.3.1 [Attribute Definition](#concepts-a-definition)
> 4.3.2 [BaseValue vs CurrentValue](#concepts-a-value)
> 4.3.3 [Meta Attributes](#concepts-a-meta)
> 4.3.4 [Responding to Attribute Changes](#concepts-a-changes)
> 4.3.5 [Derived Attributes](#concepts-a-derived)
> 4.4 [Attribute Set](#concepts-as)
> 4.4.1 [Attribute Set Definition](#concepts-as-definition)
> 4.4.2 [Attribute Set Design](#concepts-as-design)
> 4.4.2.1 [Subcomponents with Individual Attributes](#concepts-as-design-subcomponents)
> 4.4.2.2 [Adding and Removing AttributeSets at Runtime](#concepts-as-design-addremoveruntime)
> 4.4.2.3 [Item Attributes (Weapon Ammo)](#concepts-as-design-itemattributes)
> 4.4.2.3.1 [Plain Floats on the Item](#concepts-as-design-itemattributes-plainfloats)
> 4.4.2.3.2 [`AttributeSet` on the Item](#concepts-as-design-itemattributes-attributeset)
> 4.4.2.3.3 [`ASC` on the Item](#concepts-as-design-itemattributes-asc)
> 4.4.3 [Defining Attributes](#concepts-as-attributes)
> 4.4.4 [Initializing Attributes](#concepts-as-init)
> 4.4.5 [PreAttributeChange()](#concepts-as-preattributechange)
> 4.4.6 [PostGameplayEffectExecute()](#concepts-as-postgameplayeffectexecute)
> 4.4.7 [OnAttributeAggregatorCreated()](#concepts-as-onattributeaggregatorcreated)
> 4.5 [Gameplay Effects](#concepts-ge)
> 4.5.1 [Gameplay Effect Definition](#concepts-ge-definition)
> 4.5.2 [Applying Gameplay Effects](#concepts-ge-applying)
> 4.5.3 [Removing Gameplay Effects](#concepts-ga-removing)
> 4.5.4 [Gameplay Effect Modifiers](#concepts-ge-mods)
> 4.5.4.1 [Multiply and Divide Modifiers](#concepts-ge-mods-multiplydivide)
> 4.5.4.2 [Gameplay Tags on Modifiers](#concepts-ge-mods-gameplaytags)
> 4.5.5 [Stacking Gameplay Effects](#concepts-ge-stacking)
> 4.5.6 [Granted Abilities](#concepts-ge-ga)
> 4.5.7 [Gameplay Effect Tags](#concepts-ge-tags)
> 4.5.8 [Immunity](#concepts-ge-immunity)
> 4.5.9 [Gameplay Effect Spec](#concepts-ge-spec)
> 4.5.9.1 [SetByCallers](#concepts-ge-spec-setbycaller)
> 4.5.10 [Gameplay Effect Context](#concepts-ge-context)
> 4.5.11 [Modifier Magnitude Calculation](#concepts-ge-mmc)
> 4.5.12 [Gameplay Effect Execution Calculation](#concepts-ge-ec)
> 4.5.12.1 [Sending Data to Execution Calculations](#concepts-ge-ec-senddata)
> 4.5.12.1.1 [SetByCaller](#concepts-ge-ec-senddata-setbycaller)
> 4.5.12.1.2 [Backing Data Attribute Calculation Modifier](#concepts-ge-ec-senddata-backingdataattribute)
> 4.5.12.1.3 [Backing Data Temporary Variable Calculation Modifier](#concepts-ge-ec-senddata-backingdatatempvariable)
> 4.5.12.1.4 [Gameplay Effect Context](#concepts-ge-ec-senddata-effectcontext)
> 4.5.13 [Custom Application Requirement](#concepts-ge-car)
> 4.5.14 [Cost Gameplay Effect](#concepts-ge-cost)
> 4.5.15 [Cooldown Gameplay Effect](#concepts-ge-cooldown)
> 4.5.15.1 [Get the Cooldown Gameplay Effect's Remaining Time](#concepts-ge-cooldown-tr)
> 4.5.15.2 [Listening for Cooldown Begin and End](#concepts-ge-cooldown-listen)
> 4.5.15.3 [Predicting Cooldowns](#concepts-ge-cooldown-prediction)
> 4.5.16 [Changing Active Gameplay Effect Duration](#concepts-ge-duration)
> 4.5.17 [Creating Dynamic Gameplay Effects at Runtime](#concepts-ge-dynamic)
> 4.5.18 [Gameplay Effect Containers](#concepts-ge-containers)
> 4.6 [Gameplay Abilities](#concepts-ga)
> 4.6.1 [Gameplay Ability Definition](#concepts-ga-definition)
> 4.6.1.1 [Replication Policy](#concepts-ga-definition-reppolicy)
> &n
UE5 Gameplay Ability System demo: GASDocumentation
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UE5 Gameplay Ability System demo: GASDocumentation （354个子文件） 
GDAttributeSetBase.cpp 13KB GDPlayerState.cpp 11KB GDHeroCharacter.cpp 10KB GDCharacterBase.cpp 9KB GDAT_PlayMontageAndWaitForEvent.cpp 8KB GDGA_FireGun.cpp 5KB AsyncTaskCooldownChanged.cpp 5KB GDMinionCharacter.cpp 5KB GDCharacterMovementComponent.cpp 4KB GDDamageExecCalculation.cpp 4KB GDPlayerController.cpp 3KB GASDocumentationGameMode.cpp 3KB GDGA_CharacterJump.cpp 3KB AsyncTaskEffectStackChanged.cpp 3KB AsyncTaskAttributeChanged.cpp 2KB GDAT_WaitReceiveDamage.cpp 1KB GDGameplayAbility.cpp 822B GDProjectile.cpp 577B GDAssetManager.cpp 569B GDAbilitySystemComponent.cpp 306B GASDocumentation.cpp 213B GDEngineSubsystem.cpp 211B GDHeroAIController.cpp 144B GDDamageTextWidgetComponent.cpp 80B GDFloatingStatusBarWidget.cpp 78B GDBlueprintLibrary.cpp 67B GDHUDWidget.cpp 64B GASDocumentation.Build.cs 569B GASDocumentationEditor.Target.cs 412B GASDocumentation.Target.cs 398B .gitattributes 66B .gitignore 1KB GDAttributeSetBase.h 7KB GDCharacterBase.h 6KB GDAT_PlayMontageAndWaitForEvent.h 5KB GDPlayerState.h 4KB GDHeroCharacter.h 3KB GDCharacterMovementComponent.h 3KB AsyncTaskCooldownChanged.h 2KB GDHUDWidget.h 2KB AsyncTaskAttributeChanged.h 2KB AsyncTaskEffectStackChanged.h 2KB GDPlayerController.h 2KB GDGA_FireGun.h 1KB GDGameplayAbility.h 1KB GDGA_CharacterJump.h 1KB GDMinionCharacter.h 1KB GASDocumentation.h 1KB GDAT_WaitReceiveDamage.h 1KB GDAbilitySystemComponent.h 802B GDProjectile.h 747B GDFloatingStatusBarWidget.h 609B GASDocumentationGameMode.h 531B GDDamageExecCalculation.h 530B GDDamageTextWidgetComponent.h 459B GDAssetManager.h 418B GDEngineSubsystem.h 354B GDBlueprintLibrary.h 325B GDHeroAIController.h 290B DefaultEngine.ini 18KB DefaultInput.ini 17KB DefaultGameplayTags.ini 2KB HoloLensEngine.ini 1KB DefaultGame.ini 276B DefaultEditor.ini 246B DefaultEditorPerProjectUserSettings.ini 70B LICENSE 1KB README.md 308KB
gameplayabilityworldreticle.png 772KB gameplaydebugger.png 684KB showdebugpage3.png 635KB showdebugpage1.png 611KB showdebugpage2.png 606KB attributeschange.png 255KB gcfromga.png 116KB derivedattribute.png 105KB gestackchange.png 93KB setbycaller.png 83KB abilitytask.png 69KB gecontainersetbycaller.png 67KB attributechange.png 63KB costmmc.png 47KB gameplaytageditor.png 44KB cooldownmmc.png 43KB calculationmodifierbackingdataattribute.png 42KB calculationmodifierbackingdatatempvariable.png 41KB batchabilityactivate.png 37KB abilityflowchartcomplex.png 37KB cooldownchange.png 31KB abilityflowchartsimple.png 26KB gcfromge.png 18KB cooldownsbc.png 18KB scalablefloats.png 16KB UE4_Mannequin_occlusion_Mobile.uasset 9.74MB T_ML_Aluminum01.uasset 8.35MB T_JaggedRock_01_D.uasset 7.78MB T_JaggedRock_D.uasset 7.13MB T_ML_FineRubber.uasset 6.06MB T_ML_Rubber_Blue_01_D.uasset 5.25MB UE4_Mannequin__normals.uasset 5.23MB共 354 条
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