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Ue5 gas learning notes 0.1 case Preview

2022-07-28 18:37:00 【CloudHu1989】

List of articles

Preface
One 、GASDocumentation Case study
Two 、GASShooter Case study
- 2.1 brief introduction
- 2.2 Concept of coverage
3、 ... and 、Lyra Starter Game Case study
UE5 GAS A list of study notes

Preface

The last article has introduced what is GAS, What does it do , This article gives a preview of the three cases to be introduced later .

One 、GASDocumentation Case study

GASDocumentation The case is open source in Github Project on , It is also the early basis of this article , The author shared his thoughts on GAS The understanding of the , And made detailed documents and simple case presentations . The same author tranek, Made GASShooter, Yes GAS Has done a very good practical example . These two cases , A very detailed analysis will be made later .
GASDocumentation It includes a template project of a third person shooter game that supports multiplayer online , Its target audience is novice GameplayAbilitySystem plug-in unit , But not for Unreal Engine 5 Novice .
Users should know C++, The blueprint , UMG, Replication And others UE5 Middleware .
This project provides a sample , It shows you how to use GameplayAbilitySystem The plug-in establishes a basic third person shooter game that supports multiplayer online , among AbilitySystemComponent(ASC) They are located in PlayerState Class represents players /AI Controlled characters and located Character Class representative AI Controlled soldiers .
I'm making sure to show GAS Basic and some common skills represented by fully annotated code , Try to make this sample simple enough . Because this document focuses on beginners , Therefore, the sample does not include things like [Predicting Projectiles] Such high-order Technology .
Concept description :

ASC be located PlayerState still Character.
Network synchronization Attribute.
Montage of network synchronization (Animation Montages).
GameplayTag.
stay GameplayAbility Internal and external applications and removal GameplayEffect.
Use the damage value after being protected by armor to modify the character's HP .
GameplayEffectExecutionCalculations.
Vertigo effect .
Death and rebirth .
Use capabilities on the server (Ability) Generate projectiles (Projectile).
When aiming and running , Predictably modify the speed of local players .
Constantly expend endurance to run .
Consume mana to use abilities (Ability).
Passive ability (Ability).
Stack GameplayEffect.
lock Actor.
Create in the blueprint GameplayAbility.
stay C++ Created in GameplayAbility.
Instantiate each Actor Of GameplayAbility.
Non instantiated GameplayAbility(Jump).
static state GameplayCue( Bullet impact particle effect ).
Actor GameplayCue( Running and vertigo particle effects ).

The role class has the following capabilities :

Ability	Input binding	Is it predictable	C++/Blueprint	describe
jumping	Space bar	Yes	C++	Make the character jump .
gun	Left mouse button	No	C++	Shoot missiles from the character's gun , The launch animation is predictable , But missiles cannot be predicted .
Aimed at	Right mouse button	Yes	Blueprint	When holding down the right mouse button , The character will walk slower and the camera will be pulled closer (zoom in) To obtain higher shooting accuracy .
Running	Left Shift	Yes	Blueprint	When pressing and holding the left Shift when , The character runs faster while consuming energy .
Dash forward	Q	Yes	Blueprint	The character rushes forward while exhausting his strength .
Passive shield stack	passive	No	Blueprint	every 4s The maximum number of layers a character can get is 4 The shield of , Remove a shield every time you take damage .
Meteorite falls	R	No	Blueprint	The character locks an enemy and summons a meteorite , Cause damage and dizziness to it . The location is predictable, while the formation of meteorites is unpredictable .

GameplayAbility Whether by blueprint or C++ It doesn't matter to create . Here we use blueprints and C++ Mix to create , It is intended to show the use of each method .
AI The minion of control has no predefined GameplayAbility. Red soldiers have more life regeneration , Blue soldiers have more initial life .
about GameplayAbility The name of , I use _BP Suffixes denote those created by blueprints GameplayAbility Logic , No suffix means C++ establish .

Blueprint resource naming prefix

Prefix	Asset Type
GA_	GameplayAbility
GC_	GameplayCue
GE_	GameplayEffect

Two 、GASShooter Case study

GASShooter It's based on Unreal Engine 5 Of GameplayAbilitySystem (GAS) Plug in development FPS/TPS Advanced case . Research on GASShooter You should learn before GASDocumentation Relevant documents and cases , So as to gradually master GAS, After all, it is a very complex system .

2.1 brief introduction

This project is not product level code , But a utilization GAS The starting point for the evaluation of different technologies to use weapons , With a certain exploratory and experimental nature .

The relevant resources used in the project come from Epic Games Of ShooterGame Learning project ,Epic Games Of Infinity Blade And some of the tranek Self made resources .

GASShooter The current engine version is Unreal Engine 5.0, There are also some previous versions , But no longer do long-term support for them , So I suggest you update to UE5 Version of .

Key	action
T	Switch between first and third person perspectives
Left mouse button	Activate the main weapon , Target
Middle mouse button	Activate the available ability of the weapon
Right mouse button	Activate the second ability of the weapon
Mouse up scroll wheel	Switch to the next weapon in the backpack
Mouse scroll down	Switch the previous weapon in the backpack
R	Fill with bullets
Left Ctrl	Cancel aiming
Left Shift	sprint
E	Interact with interactive objects

Console command	action
`kill`	Kill local players

Heroes have magic , But currently there are no skills related to magic consumption . In the new BioShock The concept of this project started at the time of release , Intended to achieve something similar BioShock That kind of upgradeable skill , This makes the scope of the project too wide , But this may be achieved in the future .

Secondary ammunition is not used , It can be used to fill guns, grenades and other things .

2.2 Concept of coverage

Skill batch
Equipped weapons with skills
Predict weapon switching
Weapons and ammunition
A simple Arsenal
Head injury
Reusable custom target roles
Sight
Play synchronized montage animation on multiple skin bone components when using a skill
By inheritance FGameplayEffectContext Come to GameplayCue Send additional information .
Character block before HP is removed by damage
Pick up items
One click interactive system . Hold down “E” It can interact with interactive objects , Including player resurrection 、 Weapon box and sliding door .

This project does not show bullet prediction , This should be a technical difficulty . I suggest you refer to Unreal Tournament （Unreal Tournament） Source code , Learn how to do this with fake projectiles on owned clients .

weapons	Main skill ( Left mouse button )	Secondary skills ( Right mouse button )	Switch skills ( Middle mouse button )
Rifle	Fire hit scan bullets according to the current firing mode .	Aim at the present .	In fully automatic 、 Change the firing mode between semi-automatic and burst .
Rocket launchers	Launch a rocket .	Aim at the target . Start targeting the rocket . Press the left mouse button to launch a rocket at the target .	nothing
Shotgun	Launch the hit scanning projectile based on the current shooting mode .	Aimed at , Reduce the range of the projectile .	Change the launch mode between semi-automatic and full-automatic .

3、 ... and 、Lyra Starter Game Case study

The official introduction :

Lyra Is a game example for you to learn , It can help you understand Unreal Engine 5 （UE5） Framework . Its architecture is designed in modular form , It contains a core system and some plug-ins , They will follow UE5 Develop and update regularly .

Cross platform compatibility and scalability . Yes Epic Online multiplayer and cross platform game support for online services and host online subsystems .
You can choose between three different game modes ： Eliminate （ Team death competition ）、 control （ Capture control points ） And explosives （ Top down Party game ）.
Self defined Gameplay Skill system . Niagara FX.
Project Gameplay Illusory schematic diagram of concept （UMG） Control classes and UI Icon , Including menu settings 、 Handle key rocker , And health 、 Display of mana and weapons . these UI The function is designed in a modular way , So you can be independent of Lyra Use its system in your own game .
Optimized handmade content , Including mobile animation assets 、 Sound and with Pawn Compatible weapon systems .
new UE5 Mannequins Manny and Quinn. These mannequins are operational characters , Have and MetaHuman The same core skeleton level , And with a compatible animation system .

Official introduction , There is no need to carry all of them here , If you are interested, you can check it in detail through hyperlinks . The content to be analyzed in detail later is the part not detailed in the official documents , Will do detailed analysis through the source code , So that we can figure out the context .

UE5 GAS A list of study notes

Pre skills ：1. programing language C++;2.Unreal Engine 5;3.Github and VS development environment

0.0 Introduce
0.1 Case preview
0.2 Configuration plug-ins

1.0 Concept
1.1 Capability system components （AbilitySystemComponent）
1.2 Game tag （GameplayTag）
1.3 attribute （Attribute）
1.4 Property set （AttributeSet）
1.5 Game effect （GameplayEffect）
1.6 Skill （GameplayAbility）
1.7 Mission （AbilityTask）
1.8 Special effects （GameplayCue）
1.9 Skill system overall （AbilitySystemGlobals）
1.10 forecast (Prediction)
1.11 target location （Targeting）

2.0 Common skills and effects
2.1 vertigo
2.2 sprint
2.3 Aimed at
2.4 Life steals
2.5 Generate a random number on the client and server
2.6 crit
2.7 Hit
2.8 Generate target data when the game is paused
2.9 One click interactive system

3.0 debugging
3.1 Display debug information
3.2 Game debugger
3.3 journal

4.0 Optimize
4.1 Skill batch
4.2 Special effect batch processing
4.3 Skill system component network synchronization mode
4.4 Attribute agent network synchronization protocol
4.5 Lazy loading of skill system components

5.0 Suggest
5.1 Effect container
5.2 Skill system component proxy binding

6.0 difficult
6.1LogAbilitySystem: Warning: Can't activate LocalOnly or LocalPredicted ability %s when not local!
6.2 Script structure cache error
6.3 Animation montage is not synchronized to the client
6.4 The copied blueprint role sets the property set to null pointer
6.5 Unresolved external symbols ：UEPushModelPrivate::MarkPropertyDirty(int,int)

7.0 Common abbreviations

8.0 Reference material
8.1 Official documents of unreal engine
8.2 Github Open source project

9.0 Iteration log