Intro to Gameplay Abilities in Unreal Engine 4

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* This is an old video using UE4 and a much older version of the gameplay ability system. See my newer videos for more up to date information on Epic's Gameplay Ability System.
In this video I explain the basics of the Gameplay Abilities system that Epic used in Fortnite and Paragon. I cover each of the object types, how they work together, and how you can use them to build gameplay for your game.
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30 сен 2024

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Комментарии : 106

@DevGods 4 года назад

Really glad i found your channel man So much knowledge on here!!!! man thanks for this

@MaxStudioCG2023 Год назад

wow ..this is the time where you was learning like i do now :D nice progress sience 3 years ago

@andrewherrera7735 4 года назад

0:20 why don't people say .fourteen instead of .one four

@MadaoKing 5 лет назад

a little bit hard to follow the cursor but everything else is perfect!

@matthewventures 10 месяцев назад

GAS handles client side prediction and rollback of actions Gameplay Abilities… (3:24) - Defined in BP. Called by keys or BP nodes. - Mainly used to apply effects and tags. - Can be initiated on server or client - Rich tag system, unrelated to standard UE4 tags - Gameplay Ability - tag usage (21:18) - The “Advanced → Replication Policy” setting of “Do Not Replicate” only prevents replication of the ability itself but the effects will still replicate. - The “Advanced → Instancing Policy” setting of “Non Instanced” basically means the ability will be static aka “only one” (rarely used). Otherwise you can set one per actor/invocation. - The “Advanced → Net Execution Policy” spawns warnings but doesn’t actually do anything. - (23:40) Costs and cooldowns - (24:37) Event Activate Ability -Called by a keybind or “TryActivateAbilityByClass” BP node -Every path in the graph must end with the EndAbility node - (38:34) Inheritance -You can use ability effects to represent when armor is equipped (just use an infinite duration). Gameplay Effects… (11:02) -Apply attribute mods -Gameplay Abilities can ONLY affect Gameplay Attributes -Gameplay Effect - tag usage (20:42) -Gameplay Cues… (17:13) -Displays on-screen the result of Gameplay Abilities -Update UI -Play Audio -Spawn FX -Cosmetic: they only run client-side (no server) Gameplay Events… (34:41) -Useful framework for any external system to use the GAS playback system. -Example: PhysX is necessary for sweeping collision checks (UE5 otherwise only checks collisions per-frame). In order to network PhysX hits, we listen for the PhysX system’s WeaponHit event and then send a Gameplay Event. Q&A (54:00)

@SabreDartStudios 10 месяцев назад

This information is really old and I don't know how much of it is still relevant, but thanks for summarizing it so well and including timestamps :)

@mabdo88 5 лет назад

Third time to watch this video now... am beginning to understand.

@anerdwillhackit 5 лет назад

This is a GREAT! resource. Very thorough. Thank you very much for making this video, and OWS!

@KyleL_VG 6 лет назад

Hi there! Thanks so much for this video and your tutorial series. It's fantastic stuff! The Gameplay Abilities system caught my eye recently for a small multiplayer prototype I'm working on to learn UE4. I was wondering if you have a bit of time to answer a few questions about the system? It's mostly just in regards to what it can and can't be used for. Thanks!

@KyleL_VG 6 лет назад

Thanks!

@davinsaputraartandgamedev9453 3 года назад

is there a reason why you put PlayMontage first before commiting the ability btw?

@SabreDartStudios 3 года назад

It depends. Commit Ability charges you the ability resource costs. So you have to place it in your ability based on when you want the resource costs to be charged to the character.

@Pantong 6 лет назад

How did you fix // ---------------------------------------------- // Tell the client that you activated it (if we're not local and not server only) // ---------------------------------------------- if (!bIsLocal && Ability->GetNetExecutionPolicy() != EGameplayAbilityNetExecutionPolicy::ServerOnly) Throwing errors on dedicated server?

@celinopeiris5803 6 лет назад

Great Stuff, very informative and well explained - cheers! :D

@Gigastorz 6 лет назад

You mentioned a open world starter kit, where could i find that?

@SabreDartStudios 6 лет назад

Check the description on this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-PAs-9KGlVJc.html

@burningflag3679 4 года назад

Hey, hey... hey, hey... Hey... Thanks for taking the time to explain all this. You deserve more subs so here take mine.

@davinsaputraartandgamedev9453 2 года назад

Hi, so i have a proejctile that I spawn with a GameplayTask (Spawn actor). I want it to play particle when it HIT an enemy. Should I use GameplayCue for that?

@SabreDartStudios 2 года назад

You can use a GameplayCue. Or since the projectile actor has already been spawned and network replicated, you can just have it play the particle effect on impact. The problem with the second method is that it may play a particle effect on some clients, but not others. So if you need your particle effect playing to be server authoritative, the GameplayCue is a great way to do that.

@davinsaputraartandgamedev9453 2 года назад

@@SabreDartStudios i see. I have another question in a similar vein. I'm now making God Of War axe throw and recall ability. How would you get the reference to the actor spawned in the world when recalling? My method is kinda janky using BlueprintItnerface and ActorComponenet inside CharBP

@davinsaputraartandgamedev9453 2 года назад

@@SabreDartStudios i see. Do I just use the function ApplyGameplayEffectOnTarget on the Hit target inside the BP_Projectile then? With GC being implemented inside that GE (GE_Damage for example)

@VladyVeselinov 4 года назад

This is fantastic, awesome video!

@davinsaputraartandgamedev9453 3 года назад

Hi I can;t seem to find the option in UE to make a curve table asset. It only allows me to make Composite Curve Table. Where can I make Curve Table?

@SabreDartStudios 3 года назад

Composite Curve Table is the replacement for Curve Table in Gameplay Effects. I also have this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-sGY6sUUoC84.html

@davinsaputraartandgamedev9453 3 года назад

@@SabreDartStudios oh wow that's so cool. Can I manually put the value inside CompositeCurveTable tho? Like make my own row and stuff? Without using other software? Just curious

@SabreDartStudios 3 года назад

Yes, you can edit the curve values inside the UE4 editor.

@Deck_Dynasty 4 года назад

For me, GAS doesn't work in dedicated server mode. When I try to use an ability, I get this message in the output log: LogAbilitySystem: Display: UAbilitySystemComponent::OnClientActivateAbilityCaughtUp. Ability Default__GA_attack_melee_C caught up to PredictionKey 135 but instance is still active and in predicting state. Any idea why?

@SabreDartStudios 4 года назад

I remember having that problem early on when I ran the AbilitySystem->InitAbilityActorInfo(this, this); inside BeginPlay. Moving that line to PossessedBy(AController* NewController) fixed the issue.

@sarevok6 4 года назад

such a wasted opportunity when you ask any questions and nobody says anything.

@SabreDartStudios 4 года назад

A lot of people asked questions later. I guess they just didn't want to ask on the live stream. If you are looking for more Gameplay Ability System content, check out my other videos on it in the Let's make an MMO in UE4 series. Video 5, 6, 7 cover Gameplay Abilities and then there are quite a few more later in the series. I also put Gameplay Ability System notes here: gameplayabilities.com/

@sarevok6 4 года назад

@@SabreDartStudios sweet yeah I'm beginning to go through them. Thanks for all the hard work on this.

@lukecagevans8596 4 года назад

So, OWS is a Project that comes with a already made Gameplay ability system (working for multiplayer, etc.)? So it is a good idea to start my project in this?

@SabreDartStudios 4 года назад

The Gameplay Ability system we use was built by Epic for Fortnite, so you don't need to use OWS to use it. However, the Gameplay Ability system requires C++ code, so if you want to use it purely in BP, then you might want to use OWS as I have added C++ code to make it work 99% in BP. The better reason to use OWS is because you are making a Persistent World Multiplayer game though.

@sarevok6 4 года назад

Hi, I can't find it on your site, but if someone ends up using this and publishes, what is the cost of the license? I'm still setting it up and have 0 knowledge of C++ so thanks for the free resources for us noobs.

@SabreDartStudios 4 года назад

The Gameplay Ability system stuff I show in this video was made by Epic and is part of UE4. You can use it along with UE4 at no added cost.

@imjust_a 5 лет назад

Quick question: How does LightningGatheredSpellEffect keep the Combat.Magic.HasGatheredSpell on the player? Doesn't it have to be an Infinite duration to keep the tag granted (Like you showed with EquipmentEffect) My reason for asking is that in my own project, I made a super jump ability that would grant the player the tag "Combat.State.InAir", but the tag didn't stay until I set the Gameplay Effect granting it to "Infinite".

@SabreDartStudios 5 лет назад

This is a really old project, but I found it and opened it up and the LightningGatheredSpellEffect has a Duration of 10 seconds. You are correct that Instant effects will not add tags. Only Duration and Infinite.

@imjust_a 5 лет назад

@@SabreDartStudios Oh gotchya! Thanks for the clarification! It's so hard to find actual documentation on this system. This video helped immensely while I was trying to wrap my head around everything, haha!

@caleb1031 4 года назад

Thank you! This is the best explanation of the gameplay ability system that I have found. :)

@SabreDartStudios 4 года назад

Glad you found it helpful! I have another 8 or 10 videos on gameplay abilities as well as a project you can download with an ability gallery that teaches some more advanced techniques.

@davinsaputraartandgamedev9453 3 года назад

can we download this repo somewhere?

@SabreDartStudios 3 года назад

You can't download the repo used in this old video, but you can download this project that has a much newer ability gallery: rpgwebapi.sabredartstudios.com/Docs/Install I also have many newer videos on using the gameplay ability system in UE4/5.

@davinsaputraartandgamedev9453 3 года назад

@@SabreDartStudios awesome thanks!!!

@coledaugherty1321 6 лет назад

Sorry I havnt actually finished the video yet and i wll probably edit this if it gets answered, but is this almost plug and play since using OWS creates blueprints of these abilities?

@SabreDartStudios 6 лет назад

Not sure exactly what you are asking. This video is discussing the Gameplay Abilities plugin that comes with UE4. We talk about what it can do and why you should use it. This video does not show how to set it up or use it. Adding it to your project requires some C++ and much of the gameplay ability system can only be used in C++. The OWS Starter Project has the Gameplay Abilities plugin already setup, has some additional code to make them easier to use from BP's, and there are some examples as well.

@richardacherki 4 года назад

Brilliant video and gives a great amount of detail on how this system works, can't wait to get started :) Thank you very much for sharing with the community.

@SabreDartStudios 4 года назад

Glad it was helpful!

@goldenglowmaster8510 4 года назад

Where can i find the openworld starter kit

@SabreDartStudios 4 года назад

www.sabredartstudios.com/Marketing/FreeTrial

@李景天 6 лет назад

How exaclty do you use set by caller, for now, I can only use c++ to change the TMap - SetByCallerTagMagnitudes, adding my tag and float value. is there a blueprint only way?

@SabreDartStudios 6 лет назад

You can set by caller using a gameplay effect spec in BP's. Look for the BP nodes ApplyGameplayEffectSpecToOwner and ApplyGameplayEffectSpecToTarget. I will try to show this in a future video.

@李景天 6 лет назад

I am just having so much trouble trying to access data in these structures, they are not exposed to BP, and I have to go to c++ to crack open these black boxes.

@jjacobs321 6 лет назад

thanks for the video! where can I get the project files you're referring to?

@SabreDartStudios 6 лет назад

www.sabredartstudios.com/Marketing/FreeTrial

@notmyself9279 6 лет назад

So the only project files are through OWS?

@SabreDartStudios 6 лет назад

Not sure exactly what you are asking. Gameplay abilities is a plugin that comes with UE4. It normally requires C++ code to use it. The OWS starter project adds extensions that allow you to use it with just BP's.

@notmyself9279 6 лет назад

Right, so for the purposes of looking at your edits/classes that expose/extend some functionality of Gameplay Abilities to blueprints( awesome btw) you would need to install it using instructions here www.sabredartstudios.com/Docs/Install. Or is there an editor version. I had played around with GPA along time ago using an old wiki with little documentation, it was not needed for what i was working on then and too much trouble to use(c++ compiler errors for hours before getting it to work) so i decided not to use it and build a more simple system. but now id love to dive into it. OWS looks pretty large though, might be convoluted to pick out what im looking for. I suppose ill ask this here as the OWS about page left me wondering, is this something you are developing for the asset market? is it an open source project?

@SabreDartStudios 6 лет назад

OWS is a server system I have developed for creating large open world multiplayer games (MMO like) using UE4. www.sabredartstudios.com for the full features list. That install link you mentioned can be used to download the starter project for OWS. You can then rip out the relevant Gameplay Abilities code or if you are just looking to get into trying out gameplay abilities, you can use the uproject included in that download without following all the setup instructions. This will only work in editor though and you will not be able to use map transfers. But you don't need that stuff if you just want to play around with gameplay abilities. Also, that project has some BP examples you can use to get up to speed with gameplay abilities quickly. * Be sure to turn on dedicated server in the play menu the first time you open the uproject.

@JustSuds 4 года назад

Great video, I really appreciate this

@SabreDartStudios 4 года назад

Glad it was helpful!

@LeoMKyll 4 года назад

How integrate gameplay abilities to my existing project???

@SabreDartStudios 4 года назад

It takes a lot of C++. More than I could easily explain. The OWS Starter Project has the C++, so if you want to copy from there feel free to do so.

@LeoMKyll 4 года назад

@@SabreDartStudios how to get this ows starter project?

@SabreDartStudios 4 года назад

@@LeoMKyll www.sabredartstudios.com/Marketing/FreeTrial

@ezrhaen5399 6 лет назад

Hi man, Great job like always ! Tell me, when we create something with your help, is it possible after to setup server in an OVH server for example or give the possibility to be our own server without someone who got access too ?

@SabreDartStudios 6 лет назад

Not sure exactly what you mean by OVH server, but I am assuming you are referring to hosting your own OWS server. If so, that is possible. The free version runs off my server, but with the paid license you host your own servers.

@Pharoah1224 5 лет назад

Ok, great work. So, i want to make, twinblast, wrist missle/grenade to launch a moment after the missile is exposed. Is that a job for gameplay cues? And how am i scripting its flight and targeting?

@SabreDartStudios 5 лет назад

I never played Twinblast in Paragon, so you will have to explain more of how it works. I know a lot of abilities in Paragon used a two part activation sequence. One input to go into targeting mode and another to input to fire. This can be done with the Wait Target Data gameplay task set to User Confirmed instead of Instant. Gameplay Cue are usually used to play particle FX and sounds. Gameplay Cues don't modify gameplay. The Wait Target Data task also has a dropdown to choose a Target Actor that can help with targeting.

@Pharoah1224 5 лет назад

@@SabreDartStudios thanks for responding so quickly. Well, when i set up his grenade attack montage it works perfectly. My problem is two fold. I cant get his static mesh projectile to move, and i dont want it to fire off button press. He takes a moment to switch his right hand from gun to wrist grenade. In his gameplay video, the missile detaches then launches.

@Pharoah1224 5 лет назад

@@SabreDartStudios i will give this user confirmed targeting a try. Im thinking a hold time release like you did with the magic charge up. So, i will have button press, target/lock then release to fire. Does that sound right?

@SabreDartStudios 5 лет назад

If the animation time on the detach is always the same, a simple delay before firing the projectile will work.

@SabreDartStudios 5 лет назад

If you are going to use something like the hold time release that I show, then you don't want to use User Confirmed on the Wait Target Data node as that is for using the user confirmed mode of that system.

@omegablast2002 4 года назад

Outstanding video!!!!

@SabreDartStudios 4 года назад

Thanks!

@omegablast2002 4 года назад

@@SabreDartStudios quick question youve probably been asked a million times...i have a home webserver, not a big publisher or anything, just a guy learning unreal...i was looking at getting your system to try to make something me and my friends can play off my home server...what is the pricing on the server side code? The reason i ask is that i would hate to work on something for so long using your system and hosting on your server then in 3 years you decide to close up shop or sell it to some company and im left with a broken game

@OMGitsDualsub 5 лет назад

Great video man!

@SabreDartStudios 5 лет назад

Thanks!

@yiandev4368 5 лет назад

i dont understand too complex for me

@memuhtoad2354 4 года назад

Did release?

@SabreDartStudios 4 года назад

Did what release?

@memuhtoad2354 4 года назад

@@SabreDartStudios The game you are making in the video.

@SabreDartStudios 4 года назад

Ah, this was just a combat demo, not an actual game. This project no longer exists, but what I learned from it has been moved over to the actual game. It has not been released yet though :(

@memuhtoad2354 4 года назад

@@SabreDartStudios What do you feel is the biggest thing standing in the way of releasing your game, or "a" game for that matter?

@SabreDartStudios 4 года назад

Resources and time. The scope of a multiplayer game is HUGE! We are just a small team, so the amount we can get done in a a few years or so is fairly small. There is a reason games cost tens of millions and hundreds of millions of dollars to make these days. The reason is time. If you want to actually release a game, which is a big "if", then you have to have a really small scope. We have been working on trying to scope things down , but it is difficult. We went from a 20 km map to 1 km map, removed the MMO and RPG aspects of the game, and cut out a lot of other stuff you would normally expect in a multiplayer online game, but even with those cuts, there are still a few more years of work. That is just the reality of it. But we are all doing it just for fun, and it has been a lot of fun :)

@sahmailcihan9230 5 лет назад

SabreDartStudios Skype You pls ???

@UsernameNULL755 5 лет назад

honestly, to me it looks like it has no use in a singleplayer game.

@SabreDartStudios 5 лет назад

You are correct. Gameplay abilities is best for multiplayer games.

@VladyVeselinov 4 года назад

Honestly it looks pretty sweet for single player as well, I tried rolling my own gameplay effects system and quickly ran out of steam.

@PoorRoleModel 4 года назад

It actually does have a lot of use for singleplayer. You can make a template for abilities and highly reuse it for a stupid amount of different things. Everything from potions, to buffs, to cooldowns, to whatever else your heart desires. It really shines in MP, though. It's a goddamned miracle tool for prototyping, when you need a lot of things moving around. The attributes system is amazing as well. It's just such a pain in the ass to get -into- the engine. Which is how I ended up back at this video. Trying to retrace my steps with how I got it all working the last time I did. Lol

@MGSBigBoss77 4 года назад

1:16, why does every 1080p video start to be very blurry for a solid minute or so, then fix itself? (shrugs)

@retryWhore 4 года назад

Because it defaults to "(auto) 1080p" which means it's lower quality until it realizes it can handle 1080p. As soon as your video starts, click 'Settings -> Quality -> 1080p' and it will force to 1080p immediately.

@rwharrington87 6 лет назад

duuuddddeeeee............. dudddddddddeeeeeeeee!

@mabdo88 5 лет назад

Can't believe my eyes. That something that amazing exists. Thanks a lot for this effort. I will use this to develop my game. I have a really nice concept of a game if you are interested in any way, we can chat a bit. Am fairly new to development but you are helping a lot

@mrjaxen-s 6 лет назад

sorry but more and more i watch this video it seems more of a ad for you to sell some of your work with out epic getting there percent from the sells and aprovel

@SabreDartStudios 6 лет назад

This video isn't an advertisement. It was made for one of my clients though. They offered me $100 to make this video for their development team to get them started. I did it for free and decided to share it with everyone. The software I sell is not for UE4. It is backend server software (.NET and T-SQL) for any game engine (UE4, Unity, CryEngine, etc.). Because of this, Epic won't list it on the marketplace. All of the UE4 content I make is given away freely without any license.

@mrjaxen-s 6 лет назад

ok i watching the videos i was just saying what it seems like sense its marked as a tut for game ability for ue4

@SabreDartStudios 6 лет назад

99% of what is mentioned in this video applies to the stock gameplay ability system that Epic provides.

@mrjaxen-s 6 лет назад

yes i know but it all so mentioned ows and it being all ready setup instead of a tut showing how to set up gameplay ability is witch i was look for how to set up gameplay ability plug in

@SabreDartStudios 6 лет назад

Right. Like I said it was for an existing OWS customer, so there was no need to show them how to set it up ;) This isn't a how to video either. This video is an overview of what gameplay abilities can do for you (Intro to Gameplay Abilities). It isn't meant to show you how to use them. If you are trying to setup gameplay abilities in your project, you have a lot of existing resources. There is an Epic Wiki on how to set them up, there are a few GitHub projects that show how to setup the C++, and now there is the ARPG sample on the Learn tab in the Epic launcher. You can also download OWS and copy/paste the needed C++ into your project.

@octaocti8548 3 года назад

can u reupload the project please ?

@SabreDartStudios 3 года назад

This was a personal demo project. It was never made public. However, you can get a lot of the same abilities here: rpgwebapi.sabredartstudios.com/Docs/Install