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[Music]

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before we continue with the video if you

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like what i'm doing here on this channel

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please consider subscribing it helps the

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channel a lot

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anyway let's get back to the video

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welcome to my create an rpg series in

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this episode we will be further working

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on our ai

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making it a little bit more aware of its

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world by giving it perception through

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census

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so we do this by opening up our

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blueprint for our ai character

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i'm going to be closing the other tabs

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to make it a little bit more cleaner to

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work with and what we want to do is we

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want to add a component we'll type in

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ai perception

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and we can keep that name as the

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component name

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now

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for this component we want to change a

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few things

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first of all we want to actually set up

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so that it has the sense of sight

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so we'll add a census config over here

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and we'll choose

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the site config like so

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opening that up we want to change some

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of the parameters on this one so

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detection by affiliation we will click

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in all the different check boxes so we

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have all of them here

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now

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that is more or less all we need for the

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config on the sounds now we need to set

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up some functionality for what happens

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when it registers certain things and how

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to react to it

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so going to our event graph we can now

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say

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is its own perception

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okay let's do it this way i think right

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clicking over here we can add an event

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and we can say

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on perception updated

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so this will give us

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all the actors that it's

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in this frame updated its information

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for so we'll go and loop that

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and we're going to be keeping this

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fairly simple just so you know so

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er

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that the there won't be

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too much heavy lifting we just want a

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very simple functional ai that can do

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some simple things for us

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uh so this is an area that could be

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vastly improved upon later on if that's

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important for your game

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anyway for each of these elements that

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we're going through here we can say we

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want to

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get actor perception i believe there we

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go

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so this one will return our perception

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data for this specific character

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and

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it will contain an info which is a

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structure which we can break

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the

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structure in here we have some

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perception information

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among them is the last sensed stimuli

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and we can

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loop on this

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to go through all of those that are

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available for this character

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and here you can do things like you can

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compare against what kind of sense it is

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and stuff like that if you go

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and

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get sense

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class yeah that one

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and here you could check which kind of

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um

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stimuli that caused this if you want to

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do it however we're gonna be keeping it

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so simple we will only actually have one

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sense so this doesn't make a whole lot

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of sense for us

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no pun was intended

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anyway so what we can do instead is we

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just break the ai stimulus information

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that we have here

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and we can

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check against the if it was successfully

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sensed or not so we'll just put a branch

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and hook it up to that information and

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see that it success successfully um

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sends this character that we're

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currently

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updating for which is the one

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over here

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yeah and if it does we can say we we

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have done something

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um one of those things could be if we go

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to our

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blackboard again we can say we want to

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have a new key and we can say that it

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should be of type object and we can say

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that this is

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player target

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going into our object here and dropping

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it down we can change the object from

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being not the base class of object but

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instead of base class

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of actor

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the reason we do this is because

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actor allows us to do some more

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we we have some functionality in the

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behavior tree that is available to

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actors not objects

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so that's why we're changing into an

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actor

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going back to our

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character now for our ai we can now say

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well if we happen to successfully set

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send someone we can update our

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blackboard so we need to get our

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blackboard first

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like so and then we can say

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on this blackboard update a value so set

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value as object

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[Music]

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and the object will be our player target

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that we created so we can drag up from

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here and say

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make literal name

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and

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we can here type in the name of this key

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or we can

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more preferably just copy it from here

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by pressing f2

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and pasting it in like so

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so now we have the the the name of the

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the blackboard key here assigned and

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that's what we're going to be setting

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when it is true and the value that we're

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going to be setting here is going to be

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the

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the target of our sensed stimuli so we

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can get it from

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over here for example so our active

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perception

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and let's reroute a little bit so it's

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easier to

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read like so

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so now we're setting the player

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character to be this

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and this doesn't need to be more

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complicated than this for now so we can

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just test this out

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and

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how we do that is we're going to be

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first hiding our character

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so that he doesn't see us to begin with

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and that also gives us a little bit of

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time to set up

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debugging information as well

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so if we press play now and we press the

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oh no this depends on your

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keyboard of course but um

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it could be the tilde key

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or it could be the apostrophe key i

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think it's an apostrophe key

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yes it says apostrophe in the top left

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so now we have the debug

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enabled

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and we can now see

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behavior trees and ai and stuff like

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that however

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we don't see a whole lot here if we walk

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out here we can see that we don't get

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any registration information and the

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reason for that is if we make it smaller

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we need to have

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our

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third second

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third-person character the ai character

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to be the one that's selected in our

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world outline

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uh so what i did here is when i'm in uh

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game mode over here i can press shift f1

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to

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get into

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the editor mode and from then i can

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select over here in our world outliner

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and

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in this

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state now we can see here among other

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things we can see the blackboard

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[Music]

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information we can see that

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third person character 167 has been set

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as our player target

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and this happens to be the same one we

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are if you see here i'm hovering over

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and we can see that that's our

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identifier if we hover over the other

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one we can see that third person

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character two is the identifier of this

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one

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and to show that that actually is

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working we can do it like this we can

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make sure that we get the

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debug information working correctly to

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begin with like so now we can see that

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the player target is set to none i walk

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out here he sees us and we have been set

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as a target

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so now we know that that part is working

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at least

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from here we might want to actually have

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some logic that allows us to change now

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from being a roaming character to an

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attacking character the the ai that is

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so to prep for some of this we can go to

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our ai character and say

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we want to change how

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sorry not our character our um

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controller and say we want to have some

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functionality here that changes when we

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have new targets essentially

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uh to alleviate or

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allow this we will start off by creating

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a enum so we'll go to blueprints and

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enum

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and this one we can call e underscore

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[Music]

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ai state

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and we can start off by creating a

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couple here so we can say

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um

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what would be good ones

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let's say

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since roaming as our default state we

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can say roaming as our first one

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and

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attacking

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no not like that

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attacking as our other state that we

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want to go through

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now

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with these states we have an ability to

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possibly switch on the states to allow

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us to do different things

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but to make this convenient so we can

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change the state from different places

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we can create a blueprint interface for

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us so that we have this switch done

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easily

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so going to

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blueprints and

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blueprint interface we can call this bpi

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underscore

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ai

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change state very clear what it's doing

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then

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the only thing this is going to do is

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change

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ai sticks

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input will be

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an enumerator of

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what did i call it

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um

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ai states maybe yes that's what i call

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it so the enumerator ai slight

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ai state

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and we'll say that this is our

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new ai state

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as the name

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we will go to our controller we close

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the blueprint interface and we can add

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this interface now to our controller and

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say

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bpi ai change state

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we can now implement the interface

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we now have a convenient way to change

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the state for this ai

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so what do we want to do well we want to

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change the the state right but we don't

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have a variable for yet so let's create

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one and say

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current ai states so this will be the

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state that we're always in

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and we'll make it a type a i

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e e a i state this is very difficult for

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me to say

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and we can essentially say whatever is

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being sent in here that is going to be

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our new state

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that's all very good

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now we might want to have

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a different behavior tree now to

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handle that we're going to be in

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attacking form

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so let's create a new behavior tree

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under artificial intelligence barrier

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tree we can call this one baby tree

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attacking

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so now we have two different trees

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we can open this one up make sure that

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it has the same basic

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blackboard because we can share them

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among trees if we want to

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and what we can do here now is we can

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say we want to switch on this

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state

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and if we are going for roaming we want

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to copy this one and if we're

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attacking we want to change to our baby

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tree for attacking

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so now we have a very convenient way to

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switch among these and this means we can

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also remove this now and instead say

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change ai

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state

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interface call

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and say roaming as our new state so when

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we begin play we say that that's our

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goal that's going to be our states to

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begin with

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and if we click play it should hopefully

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still be roaming around over here which

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it seems to be doing because that's not

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where it started

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so

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that's all good and fine for now and i

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think that might be a good place to

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leave it for now so i hope to see you in

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the next episode

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hopefully found this video helpful if

00:12:54

you liked the video leave a like if you

00:12:56

did not like it leave a dislike leave

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any suggestions or comments you have

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down below subscribe and share this

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video if you want to see more like it in

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the future that is all for now keep on

00:13:05

learning take care

00:13:07

[Music]

Description:

This is the series to watch if you want to create a role playing game in Unreal engine with rich, deep RPG systems and advanced functionality. In this episode we will be creating an some AI behavior states to switch between. Beginner tutorial series: https://www.youtube.com/playlist?list=PLNBX4kIrA68nyGfIKgyizftebllhKc4ZX Creating game systems: https://www.youtube.com/playlist?list=PLNBX4kIrA68lvWElEzhRaCOtCjZ7L05xv Join the Discord server here: https://discord.com/invite/zBeebU7uv3 Support the work of LeafBranchGames on Patreon here: https://www.patreon.com/LeafBranchGames

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