Unreal Engine 5 Tutorial - AI Part 6: Patrol Path

In Part 6 we go through how to create a Patrol Path for our guard like AI.
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[@rocketpoweredchimpgamesphi7798]

At 1:49, the (0,0,0) node he added was done by holding 3 down and left clicking mouse for a "constant 3 vector" node !

[@Sloal]

I just spent ages looking for how he did this. Thanks

[@rocketpoweredchimpgamesphi7798]

@@SloalNo worries, I'm still a "noob" on UE even after 7 months.. Only just discovered how to debug animation blueprints while the game is running lol!

[@hygor1999]

Thank you!!

[@rocketpoweredchimpgamesphi7798]

@@hygor1999 you're welcome! 😁

[@Baleur]

One lil issue is that he will NOT respond to hearing the player while on patrol. He will however respond to seeing the player. This is fixed by making the Investigate Sequence blackboard key set to On Value change, and to abort Both.

[@DankSoss]

good catch thanks!

[@suneilangel]

I was wondering about that issue. Good one, mate!

[@raptorrex6308]

THANK YOU SO MUCH BRO! I had the same problem and I didn't know how to solve it

[@muhannadhallak8316]

Man you're awsome! Thank you

[@djtc2093]

My NPC always pauses for the same amount of time at each patrol point any idea how to fix? I have set them as different times but it only takes the pause time of the first patrol point?

[@SupercapeGames]

I’m loving these video Ryan. Thank you for making them. They have been very useful for my learning!

[@draicor]

Outstanding man, thank you for doing these!

[@asdrofllmao]

Great tutorial, Ryan, thank you for releasing these.

[@hype._.]

Thanks you for this video :) NPC does Sight Perception on PC, but I think following Patrol Path is a priority over following PC. NPC often ignores the PC even if he stands right next to Patrol Path...

[@NabrocTheGreat]

How do you learn and remember all this? It's so much!!!!! I have followed this to the letter and works perfect, so if it doesn't, I would go check your work....

[@Gulzt]

I hope for your Unreal 6 revisit you'll do this with a Spline. It's a natural fit for solving this problem.

[@brunoverde2769]

Will this series continue on KZbin or will it just be available on Patreon?

[@KingK0ma]

If your AI breaks the path after the last Patrol Point change the Greater Than to a Greater Than or Equal in the On End Waiting Event in BTTask_Patrol.

[@cristobalthompson2932]

Thanks a lot!! Just what a needed. How can Can I make when it’s reach the end of the path, instead go to point cero, do a reverse path? Thanks 🙏

[@draicor]

do something on the patrol task itself, after the ++ node, where we check for out of bounds, patrol path length > current patrol index, you could create a boolean variable called Reverse and set it to true, and then instead of incrementing we would decrement the current patrol index variable, and make sure to check for current patrol index >= 0 too, to switch back the boolean to false and start from the start again. In fact, we could make a instance editable boolean variable in our AIBehavior, so we could switch this behavior on/off for each individual NPC, so we have both, one path that reach the end and go to the start, and another path that traverse the path in reverse.

[@cristobalthompson2932]

@@draicor thanks a lot, I’ll try it 👍

[@djtc2093]

My NPC always pauses for the same amount of time at each patrol point any idea how to fix? I have set them as different times but it only takes the pause time of the first patrol point?

[@jamiemorgan6903]

AI was working perfect now it freezes on around the 4th patrol path or after it chases the player, any help around this ?

[@sahilshashank]

I can't find this project on patreon, under the AISeries folder. Can you please upload it?

[@BledardVoyage]

Thx

[@Wade978]

Hi. I set up 4 pathpoints and the AI visits each one but when it gets to the final point (num 4) it walks to a unspecified point with no pathpoint before it goes back to the first pathpoint. I also get the error ( "accessed none trying to read property CallFunc_Array_Get_Item." Node:AI Moveto graph. Eventgraph function: execute Ubrgraph BTTask Patrol Blueprint: BTTask Patrol ) and it happens after the AI is done at the final pathpoint

[@Wade978]

Never mind. Figured it out. Turns out that I made the 14:51 a > instead of a >= My bad

[@bengwynne6823]

Hey Ryan, your videos and explanations are amazing. However this doesn't work with multiplayer. It only targets the server (presumably because we are checking the actor is the Player Controller (0). How do we get this set up (with Behaviour Trees to target multiple Player controlled characters). I have seen videos using blueprints for AI perception for On See Pawn, but I much prefer the Behaviour Tree approach. Cheers

[@wolffuschia]

kzbin.info/www/bejne/a5jPcoWoqbWGb7c, this gets the seen actor which will work with multiplayer

[@FPChris]

How do you make the Ai slowly ramp up his speed from a stopped waiting position. It goes 0-MAX speed nearly instantaneously which causes the 1D Idle to Walk blend to look weird or skip.

[@RyanLaley]

Change his acceleration in the character movement component

[@yeewung8255]

I think variable"CurrentPatrolIndex"++ must greater than the length of variable"PatrolPath"-1

[@cmivey1234]

I have 4 of the patrol paths on in my nav mesh but for some reason the character will only go to the first two...after that it can't find the third one even though it's in the nav mesh and I have them all setup....the index is being set correctly...the third point is index 2 but the move to fails every time...any ideas?

[@cmivey1234]

So if I put the points in a straight line it works fine....but only in a straight line...any ideas?

[@NoxnYT]

anyone have an issue where it'll work very occasionally or just go to one or two patrol points?

[@brodiemorris2081]

i have no idea what i did but now upon starting the program he will ignore everything and run straight for me me, and when he gets to me he’ll just stand still. If I pause and look it says he’s doing the patrol behavior, but he clearly isn’t. help!

[@tvhe4d]

idk what is wrong but when I play the thing to test it the npc completely ignores me for both hearing and sight, but I followed the tutorial and rewatched every episode. but I believe it has something to do with the behavior tree.

[@aurustarsia5244]

It worked pretty fine but now out of nothing it is not following the patrol path anymore. I expanded the nav mesh area but I did not move the path points a single centimeter. It's just not following the path anymore.. can anyone help?

[@abnormel3039]

I know this comment was 4 months ago, but make sure you connect “AI Move To” to “KEYS” via On Success. I had the same issue and realized I had my connection coming out of the top pin.

[@OriginRow]

When I spawn AI from class how will it configure to waypoints/pathpoints in level automatically?

[@RyanLaley]

You can't, you can set a pre configured path route actor up I would imagine and it pick one from that

[@OriginRow]

@@RyanLaley Got it

[@labhambaheti]

@@RyanLaley can I do find reference or something of that sort like it is unity to find Patrol Points?

[@korenbenezra9324]

Some of the code could be much more efficient but still awesome tutorial, thank you! (i.e You should store an array of the keys in O(n) once and call the indexes in O(1) for every iteration. instead of calling for keys of the map every iteration in O(n))

[@NikEki-1337]

TMap is implemented as a hashtable, which has O(1) for access on average.

[@BoryslavF]

For some reason when the AI catches up to the player it slowly rotates to face 0,0,0. I can't seem to figure out what causes this. Has anyone experienced this?

[@BoryslavF]

Oh, I take it back, it slowly tries to rotate based on the last patrol rotation once it reaches me. I was just testing on the first one and it faces 0,0,0. At least I've narrowed it down.

[@BoryslavF]

So I figured out the problem. If the AI senses you while on a patrol point, it never fires the On Patroller Exit. So if you interrupt it while not on a point it's fine, but if they're on a point then it still tries to rotate.

[@BoryslavF]

I've solved it in the meantime in a non-elegant way by adding a 2 second delay and then triggering On Patroller Exit in the Patrol Point BP after the Set Actor Rotation. This way it basically rotates and immediately resets it. Hopefully this can help someone in the future.

[@katiekaliber]

Did this series get abandoned? Was fun to follow but i feel we haven't even touched 50% of what to do with ai in games.

[@RyanLaley]

Nope still coming out, up to episode 11

[@Joel-bg3cf]

My character jumps around the map, instantly appearing in places like he Flash. Very strange

[@jessicabovee4441]

I followed everything to a T. But my AI character won’t move at all. I don’t understand

[@RyanLaley]

Make sure they are standing in the nav nesh

[@jessicabovee4441]

@@RyanLaley yes I’ve even raised and lowered it to make sure

[@jessicabovee4441]

Area is green they are in it

[@edgardsimon983]

it was'nt moving then i checked and when u do it a certain way u can make the mistake to plug Controlled Pawn Var wrongly into the "WordContextObject" of AI moveTo Node From the MoveTopatrolPoint Event Pin instead of pawn (: in fact if u search Ai move to from the Controled pawn variable it automaticaly pin u here wich bug everything lmao

[@maddiehad]

Save me Barry.

[@andrakesh]

I Had Same Problem Than The others who don't know how to correct the issue when the AI is just moving to the first PatrolPoint then wait the indicated time like seconds or so, but then it starts to chose random location after the first Point What i found is that the problem was, i connect on execute instead of "On Success " node

[@choco5947]

ok like i appreciate how in depth this is but sometimes keeping it simple allows us to expand on stuff we actually need, half the stuff in this video I didn't even need all I needed to know was how to make my ai walk on a path, it's not very straight to the point.

[@ryanjdevlin87]

Insert first time meme here

[@NikEki-1337]

Damn your intro sound is so loud man.

[@MrTreeGuy]

ryan laley ur name is ryan laley