GASShooter

This is a fork of this repo which itself is a fork of this repo. I couldn't fork off of it directly because of github LFS or something idk.

Additions by Ibrahim:

I just modded here and there while I'm learning Unreal Engine. The original author has made a really good base for a shooter game, so I decided to start from here. My understanding of GAS and Multiplayer/Networking/Replication is still very little, my main objective at the moment is too see if I could have decent base for a generic shooter game.

Below are the assets and tutorial I used. All the assets used in this project are freely available from the internet, this project is meant for educational purpose only. All credits belong to their respected creator (idk how to write disclaimer or licences or anything, so if you are one of the authors and aren't comfortable with your work being distributed here, feel free to let me know so I can remove this repo).

• Lyra Art Assets (Weapon mesh, animations, SFX, VFX)
• Octahedron Procedural FP Animation System, Cannon FP Animations and Cannon Scope Sight
• ALAN_Dev Radial Damage Indicator
• UntitledProjectX Hit Marker and Kill Marker
• Jonatan Isaksson Dynamic Healthbar
• SneakyKittyGameDev Reflex Sight Asset
• ArtofSith Dynamic Reticles
• TastyTony AssaultRifle and RSh-12 Models
• Kenney Crosshair and Skull Sprite
• bulletmunchr Parallax Crosshair
• Ramsterz Takedown Animation
• Mixamo Dizzy and Knocked Down Animation
• Infima Games Assault Rifle FP Animation (from the free UE5 FPS Tutorial)

Fixes by Shadowfinder

• Upgraded to Unreal 5.2.1
• Fixed picking up items.
• Removed extra branches for double checking door state.
• Blood splatter shows up when third person perspective is enabled.
• Removed deprecated input system and replaced it with the EnhancedInputSystem.

Introduction

GASShooter is an advanced FPS/TPS Sample Project for Unreal Engine 5's GameplayAbilitySystem (GAS) plugin. This is a sister project to the GASDocumentation and information about the techniques demonstrated here will be discussed in detail in the README there.

This is not production-ready code but a starting point for evaluating different techniques in GAS relating to using weapons. TargetActors with persistent hit results and ReticleActors particularly do a lot of code on Tick().

Assets included come from Epic Games' ShooterGame learning project, Epic Games' Infinity Blade assets, or made by myself.

GASShooter is current with Unreal Engine 5.21.

Keybind	Action
T	Toggles between first and third person.
Left Mouse Button	Activates the weapon's primary ability. Confirms targeting.
Middle Mouse Button	Activates the weapon's alternate ability.
Right Mouse Button	Activates the weapon's secondary ability.
Mouse Wheel Up	Swaps to next weapon in inventory.
Mouse Wheel Down	Swaps to previous weapon in inventory.
R	Reloads the weapon.
Left Ctrl	Cancels targeting.
Left Shift	Sprint.
E	Interact with interactable objects.

Console Command	Action
kill	Kills the local player.

The Hero character does have mana but no abilities currently use it. This project's inception started when the new BioShock was announced and the idea was to include BioShock-like upgradeable abilities. That made the scope too large, but it is something that may be revisited in the future.

Secondary ammo is not used. It would be used for things like rifle grenades.

Concepts covered

• Ability Batching
• Equippable weapons that grant abilities
• Predicting weapon switching
• Weapon ammo
• Simple weapon inventory
• Headshot bonus damage
• Reusable, custom TargetActors
• GameplayAbilityWorldReticles
• Play replicated montages on multiple Skeletal Mesh Components belonging to the AvatarActor in an ability
• Subclassing FGameplayEffectContext to send additional information to GameplayCues
• Character shield that drains before health is removed by damage
• Item pickups
• Single button interaction system. Press or Hold 'E' to interact with interactable objects including player reviving, a weapon chest, and a sliding door.

This project does not show predicting projectiles. I refer you to the Unreal Tournament source code for how to do that using a fake projectile on the owning client.

Weapon	Primary Ability (Left Mouse Button)	Secondary Ability (Right Mouse Button)	Alternate Ability (Middle Mouse Button)
Rifle	Fire hitscan bullets based on the current fire mode.	Aim down sights, reduces firing spread.	Changes fire modes between full auto, semi auto, and burst.
Rocket Launcher	Fire a rocket.	Aim down sights. Starts lock-on targeting for homing rockets. Press LMB to fire homing rockets at targets.	None
Shotgun	Fire hitscan pellets based on the current fire mode.	Aim down sights, reduces firing spread for pellets.	Changes fire modes between semi auto and full auto.

Acknowledgements

KaosSpectrum provided significant contributions to figuring out how the ability batching system works and general feedback. Check out his game development blog.