Blueprint Interfaces | Unreal Engine 5 Tutorial
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- Опубликовано: 25 июн 2024
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Blueprint Interfaces are an incredibly useful tool in Unreal Engine. They allow for extremely modular systems, and scalable code. If you know anything about casting, you know that when dealing with a variety of distinct objects, it starts to break down. Blueprint interfaces are essential for things such as interaction systems, electricity systems, (ie. button and switch) and so much more. Understanding Blueprint Interfaces is essential for development in Unreal Engine, and will make your life so much easier. I hope you enjoy the video, and best of luck in your projects!
Thanks so much for watching! If you enjoyed this video please consider giving it a thumbs up, and if you want to be notified of more content from me, consider subscribing! Wish you all the best of luck with your projects!
Want to learn more about Blueprint Communication? Check out these videos:
Casting Tutorial - • Casting Explained | Un...
Event Dispatcher Tutorial - • Event Dispatchers | Un...
Link To Project: github.com/tyguymedia/tutorials
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This is maybe the best unreal 5 learning video I’ve seen yet. Great job.
Thanks for explaining these:
1. If you make a function in an interface without parameters, it'll be an event.
2. You don't need to check if an object is an interface to broadcast the event, if it's not, it'll simply not work.
Very clear video with good audio quality, love your pace too!
Oh also, I'm learning C++ for UE5, is it possible to also cover some C++ approaches in the future videos?
This was incredibly helpful. I've watched a few videos on blueprint communication but your two about casting and interfaces have been the best yet.
Thank you! I'm glad you found them useful
I'm a professional software engineer and unity C# hobbyist just getting into unreal / blueprints... your videos are helping me bridge the gap from coding concepts like interfaces and how to apply them inside of unreal blueprints... Exactly what I've been looking for. Thanks, hope you make more videos for us. 👍✌
Why is it that the best videos always have tiny view counts and sub 100 likes? I've watched half a dozen on this topic with x10 more views and likes and nowhere near the clarity.
Instant subscriber. Far better explained than most.
Please iterate through everyone else's tutorials, revamp, & teach them properly.
your voice is very pleasing to listen to
Thank you so much for this. Really clear explanation with examples and access to the project files too, which is great for people like me that learn through deconstructing.
Thanks Tyler, your videos are the most thorough an reasonably paced for laying out this info. Really appreciate it!
Omg thank you so much for this.
I'm new to unreal blueprints and I was thinking how incredibly painful to setup and manage everything was with casting etc, but with this literally everything is a million times easier, it just works and makes sense in a neat and tidy way.
I really appreciate you taking the time to make this.
Very very helpful. I've watched many Interface tutorials but this one is the best. Not too long, not too short. Clear speech. Easy to understand and follow. Thank you!
Clearest explanation I've heard so far, thank you
Yo, I appreciate this so much, I tended to avoid interfaces because it confused the heck out of me, but there were getting to be some points where I KNEW an interface would be better but I just didn't understand how it worked so I couldn't use it properly
FINALLY something clicked watching this video, I get it, or at least I get it enough to start using it enough for what I want
I was trying to find a video to explain this to a friend of mine, and this is fantastic. This is a great explanation, really clear, thanks for making it!
Best tutorial on basic interactable and also appreciate how you follow best practices which a lot of tutorial videos do not
I have spent so much time trying to find tutorials about this and yours was the best!. You deserve more subs!
Best Explanation of Interfaces I've ever heard. Wish I had this video when I was starting out.
Note: the Cast To Player is generally a safe action since the player will always be loaded.
take my like, clear and concise, and quite useful to know about this. hopefully this will get more attention.
Thank you so much, I'm glad you found it useful!
Thank you for clear teraching. Very impressive. At last i've understood this better.
Amazing, thank you so much ! Very clear, very easy to understand, it'll help a LOT !
Your video really helped me to figure out this blueprint interface thing!
I have watched many videos about the interface, I can say Your tutorial is the best explanation for interface. Thank you so much
Agreed!
Your tutorials are clear, concise, and full of practical information. Well done!
Wow, this is an incredible channel. So clear and concise.
Very well explained, thank you!
Thank you, this was really well explained!
Liked, subscribed and saved to a Tutorials Playlist.
Extra love for sharing the files for free to keep on learning!
Excellent tutorial, man.
These videos are so helpful, thank you
Amazing tutorial man!!! Thanks a lot. I finally got how it works. Definitely worth to subscribe.
Excellent explanation, thank you :)
Tyler sos una masa! I hope you keep making such helpful videos like this one. Greetings from Argentina
excellent tutorial, thank you!
Might be one of the best unreal engine tutorial videos i have ever seen. I didn't understand interfaces for a while now, and since I am getting back into UE5 development I wanted to learn, didn't know that the whole time it would only take 15 minutes to understand what it is....
Thanks a lot mate!
Your videos are really good. Thank you.
Thank you very much, this is very useful!
Great No Nonsense Information, Love it,
Great tutorial and super easy to understand. You got a new subscriber!!
oh my god! Your channel is gold! Thank you, cheers from Ukraine!
Amazing!
Excellent name choice for the cube! ;)
Very helpful, thanks! :)
Very good !!
When things don't really have anything in common - use interfaces, as Casting = Hard Reference = ALWAYS LOADED ...and yeah, it's not practical. Looking forward to some advanced tutorials from you, as the absence of "umm..." and other distracting and extraneous verbose keeps listener engagement at 100%. Well done, Ty!!
😔
@@MizzoFrizzo why so sad?
@deadreadygames I tried replying but my comments are apparently getting deleted... 😑
@@MizzoFrizzo I see your comment from an hour ago at the bottom saying you’re a big fan with heart hands. 🫶 maybe you thought it would appear at the top?
@deadreadygames No no not that comment. It's all good he must not want me talking about the reason your comment prompted my sad face...
This was amazingly helpful for me! Instant subscribe here. Do you plan on making a Playerstate or Controller tutorial in the future? The way you explain all of this actually makes sense to me and helped a TON. I would love to see what you have to say about those blueprints.
great video!
I don't need this, but I was attempting to find an advanced BP example to see if I could mentally cope using BP over code. You taught me that yes, I could.
6:15 Thank you so much, was so confused when I couldn't drag to graph to Implement Event.
You escaped me from my fear with Blueprint in UE5, the only bro who could help in whole Internet!, thank you!, all best!
Edite: Please keep it up, i subed and looking forward to learn more!
Mega Cool!
Nice
Now show how you did it for the chair and the gun! How did you avoid casting back to the player to make him sit down? Another function in the interface? What if there are multiple interactables that need to affect the players animation state, variable, etc differently? Does it end up being where the player checks which object he's interacting with and resorts to another True/False/Valid/Invalid chain to know what way to respond based off the interactable?
ty
For those who needs a bit clarity interfaces are like library of delegates (event dispatchers)
Thank you so much man, it helped a lot. I know it might sound a bit strange but can you explain or make a video about how to stop working platforms/systems with interactable actors.
Like start and stop moving platforms? If so I do that in the video, and the project files are available for download. If not can you explain further? I’ll do my best to help
This is all very cool of course. But one question haunts me. What needs to be included in the target of the message that is sent to the widget?
Nice tutorials. For the sake of simplicity, can we just use one interface for lights? Like use the BPI_interface and just add the function to the light to activate? thanks
Didn't know about the function part, and I've been using these for a while! I'm now wondering about the practice of creating multiple Interfaces, or keeping a big one with many functions, is there a performance hit? For material parameter collections it was a real hassle to keep more than one, and consolidating them was needed to add plugins that had their own. Any thoughts on that?
Theres a better option for that actually. If you want a big list of blueprint functions, you shouldn't make an interface. Interfaces are generalized for any actors, but they only do special functions. If you made a huge list of functions, it would reference the entire interface which isn't the most practical.
Instead you want to create a Blueprint Function Library.
This allows you to make a very broad list of functions but they all can serve a niche function. Then you can call the Blueprint Function Library and use any functions you've created within your BP interfaces, or in regular BPs as well
I am thinking about using BPIs for widget blueprints. Is this reasonable? If so, how would this work?
How do I change the pick up option for the gun for another item such as a sword
So, Intent to use BP Interface for accelerate the speed of BP program execute?
Thanks for your tutorial,Do you have idea about how to learn ue4 c++?
Im not a master at c++, but would honestly say it’s the same way as anything really, follow some tutorials to get your feet wet, make something simple, set a goal and Google your way to the end of it. One added piece of advise, if it’s something you’re serious about, I would get visual assist from whole tomato for visual studio. Will make your life A LOT easier. Best of luck!
@@TylerSerino Thanks for your advice
Comment for good tutorial.
Thank you very much for your contribution, it has been a great help. However, I have a problem; I don't see the option to add blueprint interface in the "inherited interfaces" section. I had read that it was a bug in UE 5.1 but the problem persists after installing 5.2. Any idea how to fix it?
That’s weird, I’ve never had that happen before. Do you see the drop-down to add the interface at all? Is it just that the interface itself isn’t showing up? If that’s the case, then my guess would be that you have it in your developer folder and don’t have the “show developer content” setting enabled. Otherwise if it’s not showing you the drop-down at all I’m honestly not sure and would have to do some digging
So for my mesh to work do I need to change them to actor blueprint? For the purpose of player can search them for let say ammo etc
Yes, if you were making an interactable object like that you would most commonly make them an actor. When you drag a mesh into the world, it creates a static mesh actor for that mesh, because anything in the world has to be an actor, but you have no control over it that way. The only time i'd drag a mesh directly into the world is maybe if it were a static prop for visuals only.
@TylerSerino thanks so much I do appreciate
Hi, great vid !
Just a question, what can i do if i don't have a direct reference, like if it doesn't come from a break hit result, what i am supposed to link here ? Actor Object Ref doesn't seem to work..
This is really going to depend on what you're making and how you're making it. You don't need a *direct* reference, but you still need a generic reference. As you can see in my example, the line trace returns a generic actor, not a direct reference but still some sort of reference to the object its hitting. In the case that you're not using a linetrace, and doing something more abstract, ie communicating between the player bp and the animation bp, it will vary. In that example, the player bp stores a reference to the animation bp so you can just reference it that way. In reverse, you can get player character from the animation bp. If you provide me more detail on what you're trying to communicate between i can maybe help more. But all in all, when it comes to getting references to things, there is no one right answer.
@@TylerSerino seems like I find the answer tysm, i just did a "get an actor of class" function, selected my other parent BP in it, promoted the return value to variable and then set it, plugged the return value to the target object and it works just fine. Tysm I’ll take notes of what u said !
one of my old games has about 150 cast fail to casts in one function, running on tick.
Same lol gotta start somewhere
Amazing explanation man ! I wanted to ask ... When you go in the Interface and create the Variable as "Actor". I am pretty sure it loads up into the Memory already as an Actor reference? I wanted to use Interfaces with "Actor" as Variable, but this stopped me ...
EDIT:
I have checked and it's basically the same as Casting ( it's a hard reference and it's loading the actor ).
When you creating the Variable and when you typing "Actor", hover over and CTRL+ALT to read the tooltip ... :( so this is a NO NO too, the same as Casting...
Im pretty sure creating a direct reference as a variable also creates a hard reference, but tbh I’m not sure off the stop of my head if it would be to actor or to the value you set it to. You can use the reference viewer to see
@@TylerSerino Yeah, need to double check this.
Thanx!
Extremely amazing Tutorial btw ✌️
Nice... but.. what if you're not doing a line trance, what if you wanted to call the interface with a key press for example.
When communicating between blueprints no matter what method you use, you're going to need some sort of reference to the blueprint you're trying to communicate with. How you get it will vary greatly depending on what you're doing. Interfaces let you use a generic reference (or parent class) instead of a direct reference, but at the end of the day you still need a reference. So for a key press, you'll need a variable that holds that reference, but without more info, I can't say for sure how you'd get that referece. IE. you could get all actors of class, you could create a variable thats instance editable and set it in the editor, you could spawn the item you're trying to communicate in, you could have a collision somewhere else in your code and use the "other actor" pin etc. etc.
does anyone know why this doesn't work for widgets? I have a very complex widget that controls a blueprint with time functions, weather, snow rain etc. all very intricate. right now the one button click in the widget triggers all these functions. Since widgets buttons don't support overlap events, I'm trying to put a collision box behind the widget button and have that box trigger the widget click button. (blueprint collision box = emulated widget button click.) Blueprint interface won't send the message to the event in my widget to replace my button click event..
I also have strange errors attempting to implement this with widgets. Mine is on the isInteractable so I didn't even get as far as you.
Hello Tyler, i have rewatched this about 4 times now and i am having a problem understanding the logic on how pressing the button ONLY activates the light and not the platform. You connect electricity to the target object but I don't understand how you designate a specific button to a target object.
Because I created a variable in the button of type actor and set it to “instance editable” then set that variable to the light for one button, and set it to the platform for the other
10:23, 10:31 In other words he eyedroppered (selected) the Light in the Level, so that it will always be paired with the specific button. (Eyedropper is when you click the object you want to use, then it saves that as the chosen object. And the "object" is an option (to Eyedrop select) because he made it an Exposed variable in the ButtonBP.)
Entire youtube is explaining same method. BUT - what if my actor-blueprint has multiple interactable parts? Like a wardrobe or a car with two doors I want to open separately, or radio with several buttons? How would this whole scheme look then?
I was actually hoping to make a video doing something like this but in short, you can encapsulate the logic on components. Ie. Make a custom static mesh component called door and put all the door logic there. Then you can just slap that into any blueprint. The one downside is you don’t get timelines in subclasses components
You can do Does Implement BPI, with a proximity check to chose the Nearest actor to Player or Mouse. (I did this for light switches and doors nearby. I step to the closest one that I want to interact with. Each door/light has its own collision box to detect if Player is within reach. But Player decides which gets interacted with first, by getting closer to it.)
Also there is a paid asset to add Timelines to components.
ALl cool and stuff but how do you do it with Valuables like 0 to 100 ? I see no tutorial and i dont get it, everytime if i try it my game crashes and delete my Input keys....
To pass values 0-100, for example, you'd have to create either an int variable, or a float (depending on if you want decimals or not) and clamp them in the code that uses them. Whether to make it an input or output is going to depend on what you're doing
@@TylerSerino well i wa t to have to use ctrl and mouse up and down to determine the hight of the player. I wil look into this!
Using this with a widget I seem to get some strange parent behavior out of the isInteractable function. Cannot order parameters ReturnValue in function IsInteractable. Cannot override 'BP_Interact_Interface_C::IsInteractable' at Is Interactable which was declared in a parent with a different signature Ever seen this before? I'm not sure what the cause is.
can't figure out why you kept checking is interactable Boolean but never used it???
At 8:32 in th video, when finishing the interactiton trace I check that value. Granted, I never actually set anything from being interactable to not interactable or vice versa during run time, but having that function is something i commonly do when making interaction systems, and wanted to demonstrate how to make use of functions with outputs.
So what if I need to access a component or variable from a class can I us a blueprint interface for that
Yea, you could make an output on an interface function than pass through the component/variable from the class that implements it
@TylerSerino could you perhaps make a video or link one if you have already made one explaining how to do this step by step
@@tacticalbacon8064 well in this video I do pass variables, for example the “is interactable” Boolean. It’ll be a little bit before I can make a video.
@@TylerSerino hi, can you make a specific video on how to BPI pass multiple variables from Actor 1 to Actor 2?
I've seen a lot of people ask this, and YT vids are too generic to show only basic BPI setup. (I think you passed a bool but unclear for other vars like pass a Player's name to a widget; pass a Sword name to widget.)
So A) how to send Actor 1's Variables to Actor 2, without CastTo?
B) And thus when to use Input vs Output variables in the BPI? (Are Input vars what we want in Actor 1, to send to Actor 2? Or do we need Outputs to be the var we want to send to Actor 2?)
C) And when to use a Call vs Send BPI Message? (Meaning to we put the BPI Call message in Actor 1 or Actor 2? Idk how to send the Variable from Actor 1 to 2.)
D) Or which actor do we put a BPI Function in, the Actor 1 that is sending the Var, or Actor 2 that is receiving?
Im confused on when to use B, C, D. Thank you.
"OnInteract" is this a Function or an Event? Usually an Event will have the naming convent "On" "SomethingHappened" like "OnHit" or "OnCollide" etc....
So what is "OnInteract"? Function? Event?
OnInteract by default will be treated like an event because there are no return values. However you can always convert events to functions
@@TylerSerino Aside from returning/not returning a value, what is the difference between an event and a function? Don't they both call into code?
When should you use an event VS when should you use a function?
I am not sure, I think events are considered asynchronous and functions are considered synchronous?
@@SirPaulMuaddib you are correct that events are asynchronous. This article does a pretty good job of explaining the differences between functions and events in depth pixelsapiens.com/functions-vs-events-in-unreal-engine-4/#:~:text=Events%20cannot%20have%20return%20values,essential%20for%20any%20multiplayer%20game
They’re pretty essential for replication and multiplayer, something I don’t deal with often myself. Mainly I find myself using events over functions when I don’t need return values, or am doing any sort of latent action such as using timelines or delay nodes. If I need to return values, store data temporarily in local variables or do anything involving knowing when the execution line ends, I use functions.
F*ck! Thank you
I have a weird question: Are these the same thing, if not work the same way as, "Interactable Interfaces" from UE4?
A little bit confused, if you're asking if they work the same as interfaces in UE4, yes they do. If you're saying there was some sort of built in "interact interface" i am unfimiliar with that.
@@TylerSerino Okay, thanks, that answers the question. Great tutorial, by the way, you earned a sub :)
I'm a big fan. 🫶