#gameplay-ai | Unreal Source | Page 108

faint fox Dec 25, 2018, 5:38 PM

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like this

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the ones which need to turn stay on navmesh

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but others just walk straight there in the air

unborn jungle Dec 26, 2018, 3:22 PM

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Is there any reason that the UT bots don't use behavior trees or any pre built UE4 AI systems?

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It seems to do everything in the AI controller and character

floral mango Dec 26, 2018, 5:00 PM

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May well be based on code that came from ye olde unreal, and has never seen a behaviour tree, would be my guess. Pretty niche and specialized too, lotsa maths if you look at it, quicker in code

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behaviour trees are only really a way of structuring code, an enabler for production workflows. If you just need one AI and have a coder that can write it....code may be easiest. If you've got X diferent AIs with different behaviours to create and a team of designers who want to rapidly prototype things....

unborn jungle Dec 26, 2018, 7:06 PM

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@floral mango thanks for explaining

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I had read that BTs are threaded but not sure if there are any performance gains or just more gains for visual clarity instead

floral mango Dec 26, 2018, 7:08 PM

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not sure if the BTs in UE can run off the game thread, possibly.

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BTs are mainly for visual clarity though, not performance reasons

pine steeple Dec 26, 2018, 7:09 PM

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bt's run on gamethread iirc

floral mango Dec 26, 2018, 7:10 PM

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BTs are great for rapid prototyping, and easy to debug. Means vaguely technical non-programmers can build AI

pine steeple Dec 26, 2018, 7:10 PM

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not 100 percent sure

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but im sure when i last profiled they were running on the GT

floral mango Dec 26, 2018, 7:11 PM

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almost certainly do by default

unborn jungle Dec 26, 2018, 9:05 PM

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Does that mean they don’t offer any gain at all and it’s equally viable to just do logic in the controller rather than many separate tasks, services and a blackboard?

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Seems almost cleaner to do it just in the controller and be careful about your logic flow

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I guess a BT is just a visual extension of an AI Controller right? Tasks just being functions and decorators just being bool checks

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Then services just being an event called at a certain interval from a timer

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@floral mango

floral mango Dec 26, 2018, 9:08 PM

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Well, it's a behaviour tree, it's a very good visual way of representing behaviour. It's very easy to maintain, re-organise, and edit the flow of the behaviour in a BT

unborn jungle Dec 26, 2018, 9:09 PM

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True but it’s also a bit obtuse needing all the different separate asset types

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Have you read Tom Loomans post on Utility AI? Seems like a nice clean option

floral mango Dec 26, 2018, 9:09 PM

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There is an overhead to it, over just pure code

unborn jungle Dec 26, 2018, 9:09 PM

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I’ll probably use blueprints so there’ll always be an overhead

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But would a BT have even more overhead than just a BP controller?

floral mango Dec 26, 2018, 9:10 PM

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Utility and Behaviour trees aren't mutually exclusive...I use utility in behaviour trees in all the time

unborn jungle Dec 26, 2018, 9:10 PM

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Oh cool I’ll have to dig deeper and maybe do that also

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Thanks for your help

floral mango Dec 26, 2018, 9:11 PM

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The actual overhead of behaviour tree over a straight controller, blueprint or code, is typically absolutely trivial compared to your main AI costs like navigation, perception, etc...so not really a factor

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If you start writing anything complex in plain controller code or blueprint, you'll very quickly end up moving towards some kind of formal method like FSM/BT/planners etc.

unborn jungle Dec 26, 2018, 9:13 PM

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Got it thanks!

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So in the case of UT

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That seems quite complex

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Did they maybe just feel it wasn’t worth setting up with BTs?

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They have all kinds of considerations like pickups and prediction

floral mango Dec 26, 2018, 9:13 PM

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There is a HTN planner lurking in the UE code at the moment btw, it's just not documented, and has no blueprint interface

unborn jungle Dec 26, 2018, 9:14 PM

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Ohhh so finally new AI stuff coming to UE4? It was doing so well years ago and tapered off

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EQS is even still considered experimental

floral mango Dec 26, 2018, 9:14 PM

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I suspect the UT bot code was a lot of copy pasta from old UT

unborn jungle Dec 26, 2018, 9:14 PM

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I see! Yeah that’s most likely the case

floral mango Dec 26, 2018, 9:15 PM

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Don't think the HTN planner is a supported feature. I just saw a tweet from one of the devs about it ages ago, and noticed it in the codebase a while back

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Don't think it was mentioned in any release notes

near jetty Dec 27, 2018, 9:53 AM

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behavior trees are quite slow

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due to their horrible pointering aroudn

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but they are super useful, and in general you are probably not going to have issues with the tasks

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unless you have behavior trees that are just badly made pingpoinging tasks everywhere

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HTN is something more for strategy games, it seems

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good old task planner

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i never liked that techniques for a fps

unborn jungle Dec 27, 2018, 9:59 AM

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@near jetty Quite slow meaning you’d consider just doing it in the controller similar to UT? Specifically making the logic for many shooter AI here (potentially 30+ on screen)

near jetty Dec 27, 2018, 10:17 AM

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only if your BTs are weird

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i use BTs in DWVR, and DWVR runs at 120 fps on PS4

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wich has a TRASH CPU

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but i did need to chill and simplify the BTs

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and make sure their blueprints gets nativized

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@unborn jungle

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UT doesnt use BTs becouse BTs are too rigid

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BTs work best for NPC AIs, like "enemy" AIs

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where they are dumbasses but have clear patterns

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if you want a humanlike AI, you dont do behavior trees

unborn jungle Dec 27, 2018, 10:25 AM

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@near jetty thank you for explaining!

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In my case I do want humanlike AI that uses the exact same player character

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As the human players

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And as little “cheating” as possible on their part

near jetty Dec 27, 2018, 10:26 AM

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a task/goal system works great for that

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imagine a behavior tree

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but instead of being so rigid

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you ponderate nodes by a weight

unborn jungle Dec 27, 2018, 10:26 AM

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Like Utility AI?

near jetty Dec 27, 2018, 10:26 AM

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yes

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instead of a secuence node, you have an utility node that looks wich of the N subnodes has more priority

unborn jungle Dec 27, 2018, 10:27 AM

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And that would be determined by a simple function that weighs the current needs right?

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Like distance to enemy, health, aggression etc.

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If I can start thinking of all the stuff that would go into a BT as simply being logic in the AI Controller, I’ll definitely be able to do something with this info

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Before I had them in my head as separate things but it seems really the BT is just organizing the logic that has to run on the AI controller right?

near jetty Dec 27, 2018, 10:29 AM

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yes

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the fun part is that you can also RNG roll it

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or change its multipliers for different npcs

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so they work slightly different

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for example one npc starts trying to flee sooner, or another npc is much more agresive

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the BT is mostly just an editable way of develop AI

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it works best when working with blueprints

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becouse that way you dont get a huge fucking mess in the ai controller blueprint

unborn jungle Dec 27, 2018, 10:30 AM

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Yeah exactly I love the rng stuff you get results you didn’t even anticipate

near jetty Dec 27, 2018, 10:31 AM

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my recomendation is that you encapsulate functionality in components

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like shooting logic

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or melee logic

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etc

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and the behavior tree just calls into that

unborn jungle Dec 27, 2018, 10:31 AM

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So if in attacking state, in the BT determine if should shoot or melee and then let the component do the specifics?

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Not sure how I can get the BT to call anything other than a task

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But I will look into it thank you 🙂

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I was thinking of doing new graphs in the AI controller for each major state like shooting, finding pickups and objective play

near jetty Dec 27, 2018, 10:33 AM

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there is also another thing

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using multiple BTs at the same time

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but that increases complexity

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this is mostly to separate movement from shooting

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so you have one BT that deals EXCLUSIVELY with movement

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and roams around the map, finds pickups, tries to dodge, etc

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and another BT who deals with shooting

unborn jungle Dec 27, 2018, 10:34 AM

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That is very cool but at the same time it can sometimes feel to the player that the AI is being sucked away down a corridor yet is engaging

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I probably just have to implement it better

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All on one BT has worked well for me usually

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With the parallel attack and move

near jetty Dec 27, 2018, 10:34 AM

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BTs are REALLY bad at dealing with complex movement and combat at the same time

unborn jungle Dec 27, 2018, 10:34 AM

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But yes it is a bit limited

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I’m going to give a shot at the AI controller only implementation and see how it goes

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Just with some super basic states and decisions

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I think I’ll be able to write better BTs after too with trying this as I’ll have a better sense of when and how to execute things

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The UT AI was the first one that gave me a real challenge

near jetty Dec 27, 2018, 10:37 AM

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good old state machine

unborn jungle Dec 27, 2018, 10:37 AM

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Was surprised at the predicting and anticipating it does

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Is it a state machine but just in code? I have to read through it properly

near jetty Dec 27, 2018, 10:39 AM

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last time i looked, it was a dual state machine

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combat/movement

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and it was based on the older UT3 AIs

unborn jungle Dec 27, 2018, 10:45 AM

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Cool so doing exactly what you suggested but without BTs! Will definitely have to look in to how it’s all set up and how often things are called

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Does seem a little bit cleaner to have it all in the controller instead of jumping around to different service, task, blackboard and bt assets

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And should be fairly ok to debug with strong state enums

near jetty Dec 27, 2018, 10:49 AM

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one recomendation

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its common to have a state machine work through inheritance and virtuals

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dont bother

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state enum

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and just switch

unborn jungle Dec 27, 2018, 10:53 AM

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Ok thanks! I’ll stick with the nice simple enum and switch in that case

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Definitely seems like it’s all I need for my relatively straightforward AI states

echo ether Dec 27, 2018, 12:32 PM

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@floral mango , I got to installed the plugin to my project. But i can't find SVO moveto node. Anything wrong i'm doing?

floral mango Dec 27, 2018, 12:46 PM

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You on the main 4.21 branch?

flint trail Dec 27, 2018, 3:49 PM

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someone on the forums stated that BTs are a way more optimized for performance than pure Blueprint AI code.. Especially if you want more than 10 AIs active at the same time

near jetty Dec 27, 2018, 4:06 PM

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@flint trail fully depends on wtf you doin

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the tasks get ticked if they are being executed

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if the blueprint AI code is terrible.. well of course its worse

flint trail Dec 27, 2018, 4:17 PM

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how does one make AI strafe / circle around player (move around maintaining distance and aim at player) using Behavior Tree ?

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oh, I forgot it's #gameplay-ai chat

echo ether Dec 27, 2018, 4:33 PM

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@floral mango , nope. 4.20.3 version

floral mango Dec 27, 2018, 4:34 PM

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Just make an AI controller that inherits from SVONAIController, it overrides the MoveTo

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does the master branch not work on 4.20? I don't think there was anything new that isn't backwardsly compatible

echo ether Dec 27, 2018, 5:42 PM

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that i did. I installed the 4.20 version of the plugin. I'll look in into it.

floral mango Dec 27, 2018, 5:50 PM

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If your AI controller is inheriting from SVONAIController, just use the regular move to BT node

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Or call the AIcontroller MoveTo from code

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I reworked the 4.21 to use a custom AI task and bt task

echo ether Dec 27, 2018, 6:17 PM

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okay. it is inheriting from SVONAIController. i used move to location node . I'll create BT and check if it's work with moveto task node.

foggy moth Dec 27, 2018, 11:38 PM

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The following is a valid actor in the level - and alive at runtime.... i can print string its Displayname, locations etc... but i cant set it as a blackboard object of type: Actor..... it is an ACharacter child - which top of the charts is AActor..... what gives?

https://puu.sh/Co14J/ee78ae2ed1.png

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i can use an EQS and select the ssame actor int he level.... is it the GetActorsOfClass node?

fallow hound Dec 28, 2018, 12:25 AM

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Where you made the key and set it to type Object, be sure to open the extended menu and choose actor. @foggy moth

foggy moth Dec 28, 2018, 4:47 AM

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@fallow hound 10 steps ahead of you :)

https://puu.sh/Co7VR/f5d99cc4be.png

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event if it were left as OBJECT - it would still work theoretically - inheritence

pine steeple Dec 28, 2018, 4:48 AM

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that get all actors seems disconnected

foggy moth Dec 28, 2018, 4:48 AM

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it is for now - i assure you it was connected in trying/attempting

pine steeple Dec 28, 2018, 4:48 AM

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so you put a breakpoint

foggy moth Dec 28, 2018, 4:49 AM

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i have it hooked up to the EQS query right now (as shown in this pic)

pine steeple Dec 28, 2018, 4:49 AM

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to see what value the array is returning

foggy moth Dec 28, 2018, 4:49 AM

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i've print stringed the entire thing - 0 is valid and returns the actor i expect it to

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however....

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TargetActor (The blackboard key) doesnt work

pine steeple Dec 28, 2018, 4:49 AM

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then its setting it to the wrong blackboard

foggy moth Dec 28, 2018, 4:49 AM

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no its not

pine steeple Dec 28, 2018, 4:49 AM

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have you told the Controller what blackboard you want to use?>

foggy moth Dec 28, 2018, 4:49 AM

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of course

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again

pine steeple Dec 28, 2018, 4:50 AM

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where? in the PC blueprint?

foggy moth Dec 28, 2018, 4:50 AM

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what you see works fine when hooked up to an EQS

pine steeple Dec 28, 2018, 4:50 AM

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oh

foggy moth Dec 28, 2018, 4:50 AM

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when hooked up to GetAllActorsOfClass.... it doesnt set it as an object

pine steeple Dec 28, 2018, 4:50 AM

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then i have no idea, is this during runtime?

foggy moth Dec 28, 2018, 4:50 AM

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even though i can cast it to Actor (even though its inherited from AActor)

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and yes - runtime

pine steeple Dec 28, 2018, 4:51 AM

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you put a breakpoint on the Setblackboard object node

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and hovered over the pins

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to see the values going in to it?

foggy moth Dec 28, 2018, 4:51 AM

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no - but even 1 better i've play tested - and look directly at the blackboard - and see hte values in the bottom right of the window

pine steeple Dec 28, 2018, 4:52 AM

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very odd then

foggy moth Dec 28, 2018, 4:52 AM

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i want to say its the return type of the GetAllActorsOfClass() array for each loop return.... vs. the EQS array return

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its the only thing that makes sense

pine steeple Dec 28, 2018, 4:52 AM

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i dislike using the Name based blackboard stuff

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mines all handled within the BT even in C++ i dont use the name

foggy moth Dec 28, 2018, 4:53 AM

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how do you mean?

pine steeple Dec 28, 2018, 4:53 AM

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i remember someone else having this issue

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where are you running that function?

foggy moth Dec 28, 2018, 4:53 AM

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inside pawn class (AI pawn bot)

pine steeple Dec 28, 2018, 4:54 AM

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ok

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when are you running it?

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in begin play?

foggy moth Dec 28, 2018, 4:54 AM

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OnPossess(override)

pine steeple Dec 28, 2018, 4:55 AM

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tried putting a delay

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of say .5

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before setting the value?

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just for testing

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cause maybe your setting it to quick

foggy moth Dec 28, 2018, 4:55 AM

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i'll say theres no need - as any print string etc.. will spit out the valid actor displayname

pine steeple Dec 28, 2018, 4:55 AM

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right im not on about that

foggy moth Dec 28, 2018, 4:55 AM

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if i do the same with EQS - it works fine

pine steeple Dec 28, 2018, 4:55 AM

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im on about the BT/BB might not be ready

foggy moth Dec 28, 2018, 4:55 AM

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so i dont think the timing is an issue

pine steeple Dec 28, 2018, 4:56 AM

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EQS is delayed return though of .1 second

foggy moth Dec 28, 2018, 4:56 AM

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this is VERY true to be honest

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i'll give this a try!

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i never even thought of the latent response of EQS

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very good point

pine steeple Dec 28, 2018, 4:56 AM

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i say .1 second its next frame, but a delay of .1 might make it work

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anyluck?

floral mango Dec 28, 2018, 9:30 AM

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My guess is that you actually have two different bkackboards

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Have you tried a breakpoint on the set value node?

echo ether Dec 28, 2018, 10:33 AM

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@floral mango , I'm still not able to make the pawn move to the desired location. I created the BT and using Move To task. I'm setting the location in AI Controller's begin play event. Also AI Controller is inherited from SVON Class. Is there anything i'm not setting in the pawn? When i try to add the movement component to the pawn and play , engine crashes. I'm using the master version in 4.20.3.

floral mango Dec 28, 2018, 10:35 AM

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You've added an SVONVolume to the scene?

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I've got some time today so I'll backport the 4.21 version to 4.20 so you can just use the new task nodes

echo ether Dec 28, 2018, 10:46 AM

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Ya, i added the volume to the scene. Thank you.

floral mango Dec 28, 2018, 12:21 PM

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@echo ether I've backported the 4.21 updates into the 4.20 branch now

jovial remnant Dec 28, 2018, 6:06 PM

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Would this be a good place to ask a question involving the NavMeshBoundsVolume?

woven bobcat Dec 28, 2018, 6:19 PM

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yep

jovial remnant Dec 28, 2018, 6:19 PM

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I have a basic Landscape in my level right now and went to place the NavMesh on top of it. However I can't get the navigation to show up when I push P. So it doesn't change to green or red. I have tried different sizes for the NavMesh and different Collisions but nothing has worked. Any ideas on how to fix this?

quiet basin Dec 28, 2018, 6:23 PM

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@jovial remnant have you built the nav mesh?

jovial remnant Dec 28, 2018, 6:24 PM

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Yes. I went and built everything, or at least I think I did

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I just clicked the Build button at the top of the screen

quiet basin Dec 28, 2018, 6:25 PM

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is it there?

📎 screenshot.1546021498.png

jovial remnant Dec 28, 2018, 6:26 PM

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Yeah I have that

quiet basin Dec 28, 2018, 6:26 PM

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@jovial remnant single?

jovial remnant Dec 28, 2018, 6:27 PM

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If you mean thats the only one than yeah

quiet basin Dec 28, 2018, 6:27 PM

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select it an make sure filled polys are checked

jovial remnant Dec 28, 2018, 6:28 PM

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That is checked as well as Nav Mesh Edges, Nav Links, Nav Mesh, and Enable Drawing

quiet basin Dec 28, 2018, 6:29 PM

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@jovial remnant ok, try to delete it and build again (build/navigation)

jovial remnant Dec 28, 2018, 6:29 PM

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just delete the recast

quiet basin Dec 28, 2018, 6:30 PM

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@jovial remnant yep, recast

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also, if you are using sublevels make sure it's on persistent one

jovial remnant Dec 28, 2018, 6:31 PM

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where is build navigation? all i see is build paths. and no I'm not using sublevels

quiet basin Dec 28, 2018, 6:35 PM

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@jovial remnant build paths (it's only child of navigation)

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@jovial remnant if it won't be there it may be an issue with properties, like cell size, slope, agent radius etc

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this may be tested by placing some large block in nav mesh

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so it could build the walking surface on it

jovial remnant Dec 28, 2018, 6:42 PM

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Hmm okay. I did do build paths but the recast isn't there any more I'll try placing some blocks and see what that does

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Okay tried both a cube and box and neither one of them worked

quiet basin Dec 28, 2018, 6:52 PM

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@jovial remnant does it work on new map?

jovial remnant Dec 28, 2018, 7:00 PM

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Not sure let me give it a try. I know I had it working in a different project and that one all I had to do was readjust the size to make it work

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it works on a new map

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Just got it work. Had to replace my Landscape and it made it work

torn tapir Dec 28, 2018, 11:21 PM

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hey everyone. brand new to unreal; I'd like to start implementing some simple roaming/patrolling in groups AI in my game. Is there a defacto toolkit that people use or should I stick to what's provided with the base unreal engine?

echo ether Dec 29, 2018, 6:22 AM

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@floral mango , I'll check and let you know.

echo ether Dec 29, 2018, 7:21 AM

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@floral mango , Do i need to set anything in the SVON volume or just drag and drop to the scene?

unborn jungle Dec 29, 2018, 10:34 AM

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@torn tapir what is provided is perfect for that

floral mango Dec 29, 2018, 10:39 AM

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@echo ether you need to try different settings, collision channel, clearances etc. 3d navigation isn't simple, can't just click a button 😃

echo ether Dec 29, 2018, 12:07 PM

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I know. I'll try out and let you know. This whole voxel thing is kinda new to me.

floral mango Dec 29, 2018, 1:01 PM

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working on the wiki page now

floral mango Dec 29, 2018, 3:06 PM

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@echo ether https://github.com/midgen/uesvon/wiki

GitHub

midgen/uesvon

3D navmesh generation and pathfinding plugin for UnrealEngine - midgen/uesvon

onyx turtle Dec 29, 2018, 6:47 PM

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Hey guys!

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I need an AI for my game and I want to create one like Metal Gear Solid style

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Any ideas on how to do it?

fallow hound Dec 29, 2018, 7:13 PM

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Well, for the mgs vision cone you got perception components

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And for the patrolling you got behavior trees and the move to node. I'd Google ue4 patrol ai for that.

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And vision perception component for sight. There are dozens of tutorials to make basic mgs ai.

onyx turtle Dec 29, 2018, 7:15 PM

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Thanks! I’ll search then

elder wolf Dec 31, 2018, 12:40 PM

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Would someone be willing to help a total noob? (I'm actually just a 3d artist trying to make my first game)

I follwed "UE4 With Casey - Tower Defense Tutorial - Part 1 - AI Setup"

Yet I do not fully grasp what is happening
At the same time, I checked repeatedly, but my code seems to be the same, yet my AI isn't walking in the path I made.
I am positive the fault is not within the navmesh.
If you are so kind, point me at some tutorials to get a basic understanding.
Or DM me so we can figure out the error together. I wouldn't want to spam this place with 7+ screenshots unless necessary.

Much thanks in advance

-Raoul

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if I should have asked in #blueprint do tell me so too, new to the server as well
I humbly ask for help

hybrid cipher Dec 31, 2018, 4:21 PM

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Hey where's the tutorial at?

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Feel free to DM me, I'll try to help out, this seems it can take longer

echo ether Jan 1, 2019, 8:46 AM

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@floral mango ,Thanks a lot. I've read about the basic setup. I'll check the detailed information section.

outer cape Jan 1, 2019, 10:13 PM

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If I were to use Behaviour Trees, and had to make custom Tasks, is it recommended that those Tasks get variables from the controller that runs the behaviour tree, or the pawn that controller controls?

timber sun Jan 2, 2019, 4:28 AM

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There are blackboards for variable storage

swift bolt Jan 2, 2019, 10:38 PM

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Did 4.21 break dynamic nav mesh generation for anyone? Packaged games and my ai can't navigate anymore. Editor sometimes.

swift bolt Jan 3, 2019, 1:57 AM

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Yup in editor 32 tries in and this happens, https://gyazo.com/d6bffc0665b8f41da6ca101d05b07a38 AI Can't move because the nav mesh around it never generates.

Gyazo

timber sun Jan 3, 2019, 6:57 AM

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@swift bolt https://github.com/EpicGames/UnrealEngine/commit/8caea54fb6d3f0575b9940c95b9cec86fc56f34e

echo ether Jan 3, 2019, 9:34 AM

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@floral mango , I changed certain settings but still no luck. My pawn won't move to the desired location. I don't know what am i doing wrong.

📎 Fly_Ai.png

floral mango Jan 3, 2019, 11:12 AM

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@echo ether have you looked at any of the debug visualization? What is the log saying?

echo ether Jan 3, 2019, 11:17 AM

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@floral mango , Which debug visualization you are referring to?

floral mango Jan 3, 2019, 11:17 AM

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enable debug voxel or debug leaf voxels when and click the generate button

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what does the log output say?

echo ether Jan 3, 2019, 11:22 AM

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This is the one you referring correct?

📎 Logdata.png

floral mango Jan 3, 2019, 11:22 AM

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ok, so where is your pawn? it's definitely not in a blocked area?

echo ether Jan 3, 2019, 11:26 AM

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@floral mango , cube is the pawn. how do you know it's not in the blocked area? It's currently in the red cube section. Pardon me for my knowledge.

floral mango Jan 3, 2019, 11:27 AM

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the red cubes are the blocked voxels. If the pawn is inside it, then it won't be able to move

echo ether Jan 3, 2019, 11:31 AM

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okay, i moved it from that section. Then when i generated the volume again, red cube is generated around the pawn. is that how is supposed to be?

floral mango Jan 3, 2019, 11:32 AM

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you need to make sure that nothing on your pawn is blocking the collision channel you're using to generate the svo

echo ether Jan 3, 2019, 11:41 AM

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So if i'm setting the collision channel in SVO to pawn, then if i'm overlapping the same in my cube, it should work right?

floral mango Jan 3, 2019, 11:43 AM

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just make sure that whatever channel you use for the SVO generation, isn't blocked by anything on the pawn itself. If you see red boxes around the pawn, then something is blocking it

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try a different collision channel, worlddynamic or something

echo ether Jan 3, 2019, 11:49 AM

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yeah i did that, now there is no red boxes around the pawn. But still pawn is not moving. I set the collision of the cube to no collision and the sphere around it to world dynamic. So the AI pawn overlaps theobject type pawn.

floral mango Jan 3, 2019, 11:50 AM

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what does the log say

echo ether Jan 3, 2019, 11:53 AM

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📎 Logdata.png

floral mango Jan 3, 2019, 12:35 PM

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i mean when you run it

echo ether Jan 3, 2019, 1:36 PM

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@floral mango , nothing special i guess. only shows the move location

📎 logdata2.png

floral mango Jan 3, 2019, 1:38 PM

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where is it trying to move to? Is your behaviour tree executing?

#

check the visual logger as well

floral mango Jan 3, 2019, 2:00 PM

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just submitted some enhancements to logging setup.

silent nexus Jan 3, 2019, 2:08 PM

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how to fix this 😦 the AI will stop in the stairs -.-

📎 unknown.png

swift bolt Jan 3, 2019, 2:11 PM

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@timber sun that's a relief, I'll just move into other things for now

echo ether Jan 3, 2019, 5:17 PM

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@floral mango ,I'll check out and let you know.

floral mango Jan 3, 2019, 5:19 PM

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@echo ether no probs, it's useful to get these questions so I know where to clear up the logging and documentation and stuff

pine steeple Jan 3, 2019, 6:53 PM

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@silent nexus your navmesh wont allow them patht here cause its broken

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so they will get stuck

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will need to adjust the navmesh settings until it blends on the step, or maybe there is a collision n the steps breaking the navmesh

echo ether Jan 4, 2019, 4:57 AM

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@floral mango , Its trying to go to the Move location which is vector. I'm setting this when begin play of the controller executed. It shows SVON Move to is executing in AI debug.

📎 Ai.png

echo ether Jan 4, 2019, 5:57 AM

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@floral mango , I looked up in the forum. It shows sample path in green line. How to enable that?

floral mango Jan 4, 2019, 8:19 AM

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the visual logger will display it. The path follower renders a green line, and the SVON code renders black wireframe boxes

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you should be seeing some SVON related messages in the log...it doesn't look like your behaviour tree is executing

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you definitely have the bt and blackboard setup correctly?

echo ether Jan 4, 2019, 9:13 AM

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@floral mango , I think so. Because the move location which is a blackboard key is setting correctly. I'm setting the same key to the SVON MoveTo node. What exactly you mean by visual logger? I have set everything in SVONNavigation Component.

floral mango Jan 4, 2019, 9:14 AM

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https://docs.unrealengine.com/en-us/Gameplay/Tools/VisualLogger

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you should be seeing SVON related output in the message log

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put a breakpoint in UAITask_SVONMoveTo::PerformMove(), make sure it's being hit and step through to see what it's doing

echo ether Jan 4, 2019, 9:24 AM

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@floral mango ,I'll check that. SVONMove To Task is failing. I just created one more task to verify whether its executing successfully or not.

floral mango Jan 4, 2019, 9:24 AM

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the output log, and the visual logger should be telling why it's failing

echo ether Jan 4, 2019, 10:32 AM

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@floral mango , Path is set to none which means it's not recognising the SVON volume right?

📎 Visul_Log.png

floral mango Jan 4, 2019, 11:13 AM

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did you step through the task?

echo ether Jan 4, 2019, 11:17 AM

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nope

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u mean in the behaviour tree?

echo ether Jan 4, 2019, 12:25 PM

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@floral mango , I don't know how to do it if you meant to run it from the source file.

patent hornet Jan 4, 2019, 12:28 PM

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@echo ether your Pawn isn't Possessed on Controller's BeginPlay

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nor does the Pawn have a Controller in its BeginPlay... yet

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use OnPossess(ed) instead

echo ether Jan 4, 2019, 12:29 PM

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@patent hornet , okay i'll try that

floral mango Jan 4, 2019, 12:34 PM

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@echo ether also just occurred to me....in your Project Settings, make sure you have Gameplay Tasks enabled

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can't remember exactly what the settings is called, I'm not in front of UE at the moment.

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Might be AI Tasks. Just search for 'task' in project settings

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ugh yep I didn't clean up the BT task properly, so when you don't have Gameplay Tasks enabled, it'll fall back to your default AIController 2D MoveTo, and fail

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makes github issue

echo ether Jan 4, 2019, 12:40 PM

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@patent hornet , I tried. but didn't make any difference

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@floral mango , yeah, i searched. Finally it says missing movement component

📎 log_data.png

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@floral mango ,its BT_AI Task

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@floral mango ,its showing green path to the location now

floral mango Jan 4, 2019, 12:42 PM

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cool. Well the pathfollower needs some kind of movement component to navigate with

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again, I'm not in front of UE at the moment, there's a default flying movement implementation

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forget what it's called

echo ether Jan 4, 2019, 12:44 PM

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@floral mango ,its fine. I'll search and let you know if i find it

floral mango Jan 4, 2019, 12:45 PM

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look at the spectatorpawn, see what movement component it uses

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thanks for the feedback again, sorry it's taken a trial and error to get it working, but at least I've filled all the documentation gaps now 😃

echo ether Jan 4, 2019, 12:46 PM

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I added floating pawn movement. now its moving to the desired location. That's what you were referring?

floral mango Jan 4, 2019, 1:15 PM

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yup

eternal stag Jan 4, 2019, 1:19 PM

#

So I very recently started dipping my toes into AI stuff, and I currently wanna just do some basic navigation. I set up a basic BT that makes my AI characters follow a prop that I can move around. That all works nicely, but now I want to make my AI be able to open any doors that might be in their way. What's the best practise to go here? I was thinking of maybe attaching a trigger volume to the door, that would force the AI to interact with it when overlapping, but that sounds like it might be introducing issues and ambiguity.

floral mango Jan 4, 2019, 2:10 PM

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it's not a trivial problem 😃

#

need to think about when and how they decide to open doors. Do they just pathfind through the door, and when the path follower enters a doors trigger volume, it interrupts the path follow, performs a door opening action, then gets it back onto the path and resumes?

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or does it not know where it wants to go outside the room, it just chooses to navigate to the door's interaction point, open it, and then reevalute

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AI interaction systems can be pretty complex on their own, I'm not sure UE has anything out of the box

eternal stag Jan 4, 2019, 2:40 PM

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I found something with navlinks on a google search

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gonna try and see if I can do something with that

echo ether Jan 4, 2019, 2:41 PM

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@floral mango , thanks a lot. i'll be asking questions regarding the same though.

unborn jungle Jan 4, 2019, 8:46 PM

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Is what the AI perception system is essentially doing under the hood for vision simply doing sphere traces (or somehow cone traces) at a fixed interval and then populating an array of found actors there?

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I’m thinking of forgoing the perception system in favor of my simple system like this

misty osprey Jan 4, 2019, 9:18 PM

#

I want to rotate the AI. when I put the the finish execute at the end it does not do any of the code before. when I dont put the finish execute on it he rotates but the tree gets stuck at this task. how do I fix this?

📎 22222.png

unborn jungle Jan 4, 2019, 10:17 PM

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@misty osprey because it does one ticks worth of rotation then finishes

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You should check on each tick if the current rot = target rot and if so then finish execute

misty osprey Jan 4, 2019, 11:27 PM

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@unborn jungle dude its actually working now. thank you so much.

unborn jungle Jan 4, 2019, 11:28 PM

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You are welcome!

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Interps can be a little tricky to get your head around sometimes

misty osprey Jan 4, 2019, 11:29 PM

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yeah thats true, I just rotate him, that it gets off the rails so hard is frustrating.

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this is from the ascher einhorn tutorial. I do not know whats causing it. its correct and it works but when I close the editor this gets spammed in the output log. its a build in function. any chance you or someone else now how to resolve it?

📎 22222.png

misty osprey Jan 4, 2019, 11:55 PM

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nevermind, I found a solution

floral vigil Jan 5, 2019, 2:50 AM

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@unborn jungle For each actor, it's just a dot product to check if the angle is within vision FOV, and then a line trace to see if there's line of sight.

unborn jungle Jan 5, 2019, 3:15 AM

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@floral vigil thanks!!

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Would you say it’s viable to do your own checks instead of using the AI Perception component?

floral vigil Jan 5, 2019, 3:38 AM

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@unborn jungle Totally viable. What's your main reason for not wanting to use it though?

swift bolt Jan 5, 2019, 8:52 AM

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Anyone know why my Get Actors Perception's Info's LastSensedStimuli Array has Sight as 1 and Hearing as 0 when in the AIPerception Sight is 0 and hearing is 1?

#

https://gyazo.com/3e24480ae838869d17e1b64451c4fae3

Gyazo

unborn jungle Jan 5, 2019, 10:02 AM

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@floral vigil just so I can write and extend the system exactly as I want

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And understand how it works

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Also perception hasn’t had updates in a long time and docs are minimal

low oak Jan 5, 2019, 10:18 AM

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Hi anyone know how to make a random task to behavior tree?

misty osprey Jan 5, 2019, 5:55 PM

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I want to set the default state to either a random point or waypoint in the AI_BP. but it kinda wont work. both branches work but it picks the first one. does someone know how do I set this up?

📎 44444.png

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the lower BP is the BTS on the selector.

unborn jungle Jan 5, 2019, 6:13 PM

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Does anyone know the difference between GetRandomReachablePointInRadius and GetRandomPointInNavigableRadius ?

misty osprey Jan 5, 2019, 6:16 PM

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navigableradius is a point on the navmesh. the other is a point in space.

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the first one will probably take obstacles into account.

unborn jungle Jan 5, 2019, 7:13 PM

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Thanks!

unborn jungle Jan 5, 2019, 8:18 PM

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How can I make the move to function call a new event on completed?

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I see the enum that is available as a return but not sure how to bind that to an event

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Unless I call the move to function at a fixed rate with a fixed distance and check if the enum == completed each time?

pine steeple Jan 5, 2019, 9:52 PM

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@unborn jungle the AIController has a delegate

#

OnMoveCompleted

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you can bind too

unborn jungle Jan 5, 2019, 9:52 PM

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@pine steeple thanks!

#

I've got it working by running the function at a fixed rate and querying the enum

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Not sure if this is similar to how the behavior tree does a move

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Or if they just doe the delegate

pine steeple Jan 5, 2019, 9:53 PM

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yeah but there is a callback for it, and no

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behaviour trees hook into a delegate which gets checked

unborn jungle Jan 5, 2019, 9:53 PM

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So how does the delegate know it's done? Is there some fixed rate check happening under the hood in the move to function?

pine steeple Jan 5, 2019, 9:54 PM

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so when you call MoveTo

#

it begins a latent action which moves the AI

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when the ai reaches his goal, he fires the completed delegate

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theres two type of MoveTo tho

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theres Tasks and normal

#

i would recommend the Task version

#

https://gyazo.com/11a009767c674b16d124ae4f38c55ddb

Gyazo

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over this version: https://gyazo.com/25a0acaaf312c9ef09db146a61ff72e0

Gyazo

unborn jungle Jan 5, 2019, 9:57 PM

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Thanks for explaining! I don't have the first node even with context off?

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I'm using the second one currently

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and querying the enum

pine steeple Jan 5, 2019, 9:58 PM

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well you need to enable the first node

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in settings

unborn jungle Jan 5, 2019, 9:58 PM

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Is it experimental or something?

pine steeple Jan 5, 2019, 9:58 PM

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but the second one, there is a delegate you can bind too

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well kinda, but we use it our game and it was used in Epic internal games

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only one downside to it, it doesnt use Filters

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but i made a custom version to take in a filter

unborn jungle Jan 5, 2019, 9:59 PM

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I think the normal node I'm using will work fine, nothing crazy fancy going on that I need

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So for a noob like me- how do I go about enabling the delegate

pine steeple Jan 5, 2019, 9:59 PM

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then bind to the delegate

unborn jungle Jan 5, 2019, 9:59 PM

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Or getting it to call something?

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Oh bind event to onmovefinished?

pine steeple Jan 5, 2019, 10:00 PM

#

https://gyazo.com/ef173271d788c9bba5f620881e4c3e47

Gyazo

unborn jungle Jan 5, 2019, 10:00 PM

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And in a function is this possible too?

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I have several move functions

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To enemy, to waypoint etc.

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Each do different things when completed

pine steeple Jan 5, 2019, 10:01 PM

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ermm no, cause it has to call and event but you can call the event to bind from a function

unborn jungle Jan 5, 2019, 10:01 PM

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Ok thanks a lot

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This has explained delegates really well for me

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they are basically like event dispatchers right?

pine steeple Jan 5, 2019, 10:01 PM

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https://gyazo.com/2108b9f07db960cc39a148015ea42cc5

Gyazo

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https://gyazo.com/919a718d86194532b9ebb235279b5f5a

Gyazo

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something like that is doable

unborn jungle Jan 5, 2019, 10:02 PM

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Ahh I see

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thanks!

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In the case of doing it at a fixed rate, is there anything terribly bad about it?

pine steeple Jan 5, 2019, 10:02 PM

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not sure, never done fix rate stuff (not even sure what you mean by fixed rate)

unborn jungle Jan 5, 2019, 10:02 PM

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Just calling the move to at the same location 10 times a second and checking if done each time

pine steeple Jan 5, 2019, 10:02 PM

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oh thats bad for performance

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you should call it once, only and wait for it to finish

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but we handle our ai movement using a different method, to ensure smooth movement without stopping everytime the move to complete

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it basically follows a constantly moving target, which gets moved, so it "tracks" the moving target (which is invisible)

unborn jungle Jan 5, 2019, 10:04 PM

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So in your case you would be calling it multiple times a second?

pine steeple Jan 5, 2019, 10:04 PM

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no

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we call it everytime we need to update a location

unborn jungle Jan 5, 2019, 10:05 PM

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If the target is constantly moving, wouldn't you need to call it fairly often?

pine steeple Jan 5, 2019, 10:05 PM

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and the function gets called once, and it tracks it in tick on that move to task

unborn jungle Jan 5, 2019, 10:05 PM

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Oh so it never completes

pine steeple Jan 5, 2019, 10:05 PM

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and that task wont finish untill it reaches the goal

unborn jungle Jan 5, 2019, 10:05 PM

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It's always in progress

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Ok so it's the calling of the move to function that is the expensive part, even if not specifying a new location?

pine steeple Jan 5, 2019, 10:06 PM

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yes

unborn jungle Jan 5, 2019, 10:06 PM

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For example I have traces and other stuff firing off much more frequently

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For sight and stuff

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But this would be more expensive than all that?

pine steeple Jan 5, 2019, 10:06 PM

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traces aint too bad if there filtered properly and not all complex

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but yeah, everytime you call MoveTo, it has to reallocate, recreate a new path etc

unborn jungle Jan 5, 2019, 10:07 PM

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Ah I see

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Thanks a lot for helping

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I'm going to rewrite the functions with the delegate now

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Thanks

pine steeple Jan 5, 2019, 10:07 PM

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np

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is there a reason you are not using behaviour trees?

unborn jungle Jan 5, 2019, 10:18 PM

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@pine steeple Yeah honestly I'm enjoying creating the AI in a different way

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And honestly with having to create tasks and keys and stuff it feels more obtuse to do it in the BT

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I only recently realized you can do it in the controller if you have the correct flow control, BT is just a visual representation

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But yes I'll probably end up using it in the end if things get more complicated

unborn jungle Jan 5, 2019, 10:54 PM

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@pine steeple if I for example move to on my roam state and set the on completed delegate bind there but then the ai sees an enemy before it completes and moves to enemy and sets the on completed delegate bind again, will this cleanly override the previous bind and drop the previous movement?

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It seems to work as expected so far...

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Or do I only need to bind once as the ReceiveMoveCompleted is a global delegate and it will always call regardless of where you call the move to?

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Maybe I can set the bind once on begin play in that case....

misty osprey Jan 7, 2019, 12:23 AM

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I thought the AI-Perception thing handles sight, why can they see me through walls so I need an additional linetrace?

patent hornet Jan 7, 2019, 12:50 AM

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it does a cone check iirc

misty osprey Jan 7, 2019, 1:47 AM

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whats iirc?

fallow hound Jan 7, 2019, 2:00 AM

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If I recall correctly

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Also I do believe ai perception doesn't handle things blocking view, but I could be wrong.

#

This article might be a start https://blog.gamedev.tv/ai-sight-perception-to-custom-points/

GameDev.tv

AI Sight Perception to Custom Points - GameDev.tv

In this post, Unreal Engine Developer course student Carlos shares his awesome detective work (and code) on getting AI sight perception to custom points… On the way to creating a metal gear solid clone game, I was following the testing grounds videos. I already had guards w...

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Actually looks like they shouldn't see thru wall https://answers.unrealengine.com/questions/240212/ai-perception-can-see-through-walls.html

misty osprey Jan 7, 2019, 2:50 AM

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thanks dude! I´m using at the moment, only geometry boxes. there is no collision to set up.

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there is only spawn collision method. but I dont think thats importent for that.

worldly mural Jan 7, 2019, 2:58 AM

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I have a VERY simple ai (currently). All it does currently is walk around occasionally. But anyway, I was wondering how I would make it avoid other actors. Not run away, but just not go inside of it. I have an actor class that I need the player to not collide with, but AI to collide with.

misty osprey Jan 7, 2019, 3:06 AM

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get all actors of class, put your AI-characters in it. and than I dont know. lol

worldly mural Jan 7, 2019, 3:23 AM

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Does anybody know how I could do this?

misty osprey Jan 7, 2019, 4:17 AM

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probably, just wait

misty osprey Jan 7, 2019, 4:42 AM

#

I was searching for something else and came across this. maybe it helps with your problem. https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/1531345-ai-gets-stuck-in-other-ai

Unreal Engine Forums

I have a very simple ai system set up in which ai pick a random point from a set of predefined positions, move to it, and then repeat. I have a lot of AI in

fleet meteor Jan 7, 2019, 12:52 PM

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@worldly mural I use RVO avoidance. But there is something called DetourCrowd that I don't know much about.
https://wiki.unrealengine.com/Unreal_Engine_AI_Tutorial_-_2_-_Avoidance

Unreal Engine AI Tutorial - 2 - Avoidance

hybrid cipher Jan 7, 2019, 1:24 PM

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@worldly mural depends on what you want, there are two built-in ways for pawn avoidance in UE as Floss mentioned. I was trying both and they can have a huge impact on your FPS if there is a lot of agents in the scene. If this was the case, then you might consider just creating your own simple avoidance.

RVO is the simpler one, but it will make your pawn slide to side by default so you will need to leverage that. DetourCrowd is more sophisticated but also has larger impact on FPS. Be sure to check Crowd Manager in Project settings (I think?) that will give you parameters to play with to improve the behavior of the AI

worldly mural Jan 7, 2019, 6:02 PM

#

I ended up using RVO avoidance for now

#

I might eventually make my own, thanks!

echo ether Jan 8, 2019, 10:17 AM

#

@floral mango , I think the plugin is not working as intended. I created patrol points so that the pawn can go back and forth between those 2 points. the issue it is going to the specific point and the path for the next location is calculated from the original point of the pawn and not from the current location. There by it takes more time to reach the next location also it sometimes get stuck trying to reach the original location instead of going to the next location. How can this be fixed? I tried adjusting clearance setting, but didn't change anything. https://drive.google.com/open?id=1BEIXofB6ewy7pGddXpOLqFfVKHVWR8UD

#

@floral mango , I just made a video of it. The link is above.

floral mango Jan 8, 2019, 11:09 AM

#

@karti the AIcontroller isn't moving. There's a property you can enable in the controller that makes it move with the pawn

echo ether Jan 8, 2019, 11:40 AM

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@floral mango , that was the fault. But when i used navmesh i don't remember setting that property. Now it moves accordingly. But if the placement is slightly above then it gets stuck. Suppose if i wanna implement something similar, where i need to start?

floral mango Jan 8, 2019, 11:51 AM

#

Not sure what you mean? Just boarding a flight so won't be online for a whike

echo ether Jan 8, 2019, 12:19 PM

#

@floral mango , that's okay. I meant the approach to the solution. Suppose if this plugin was not available, then i would have to implement on my own. In that case, where to start from? like researching about it? or to google the heck out of it? i wanted to know how you end up finding a solution , in this case writing the own plugin. If i wanna make my own plugin about something then how i go about it?

eternal stag Jan 8, 2019, 1:15 PM

#

Is there any event that triggers on an AI controller using a navlink?

#

I want to place a navlink component on my door

#

and have the AI open it first when it uses that navlink

pine steeple Jan 8, 2019, 2:21 PM

#

yeah ReachedNavlink on a smart link

#

gets fired

wet iris Jan 8, 2019, 4:55 PM

#

So how far has eqs come since 4.8

#

I finally had the patience and watched the advanced ai live traininh

#

From back then

#

And im building my ai (was already) using my own line traces to check for navegable locations and visibility to player (so they can find a spot to fire at player) with bp's, but im wondering since eqs is coded in c++ if it will be more efficient

pine steeple Jan 8, 2019, 10:44 PM

#

i use EQAS alot

#

EQS*

#

and its been good so far

#

i have around 3 eqs per AI and about 60- 80 AI at a time on map, EQS is about .5ms

#

which is not bad

#

and some are pretty heavy

floral mango Jan 8, 2019, 10:53 PM

#

@echo ether writing your own 3d navigation system? Well you need to design it on paper first...what technique are you going to use, what data structures do you need, what pathfinding algorithms are you going to use. Then you get coding. It's pretty much all up to you, the engine just tells you where the geometry is

#

the method I used was from a GDC talk. It's pretty engine-agnostic though, didn't take me much effort to port it from unreal to another engine

hybrid cipher Jan 9, 2019, 12:48 AM

#

hey everyone just a quick question, is there a way to check which way is my AI moving? GetVelocity just returns 0 vector

fallow hound Jan 9, 2019, 12:49 AM

#

might it be something in charactermotion? assuming it is character?

hybrid cipher Jan 9, 2019, 12:50 AM

#

yea well basically I just wanna align AI so it doesn't slide when using RVO

fallow hound Jan 9, 2019, 12:50 AM

#

ah, I haven't messed with RVO, wish I could be of more help

hybrid cipher Jan 9, 2019, 12:51 AM

#

ah no worries, I think I won't be using in the end anyway, but seems like a good thing to know :)

fallow hound Jan 9, 2019, 12:52 AM

#

yeah it was discussed here recently, sad to hear its a performance hit

#

I wonder if its a hit in the near 100 count of npcs, or as low as 20-30

hybrid cipher Jan 9, 2019, 12:53 AM

#

I tried with around 60 npcs and it went to upper 40s for me in more or less empty scene

fallow hound Jan 9, 2019, 12:53 AM

#

oof

hybrid cipher Jan 9, 2019, 12:53 AM

#

well detour was even worse :D

fallow hound Jan 9, 2019, 12:53 AM

#

do you know if it was rvo for sure?

#

character motion is a big hit too ive heard

hybrid cipher Jan 9, 2019, 12:54 AM

#

ah I'm not sure, I was merely checking difference between rvo and detour

#

I figured you need character motion for rvo anyway, it's where it's set up

fallow hound Jan 9, 2019, 12:54 AM

#

yeah, i wonder what the fps for that project would have been with only char motion and no rvo

#

ive heard with high npc counts you gotta lod char motion somehow

hybrid cipher Jan 9, 2019, 12:55 AM

#

it's about making compromises for sure

#

you wouldn't happen to know how AI perception component detects things? seemed to me it was running in a different thread

fallow hound Jan 9, 2019, 1:13 AM

#

I do not know sorry, I've heard it is pretty efficient

#

in general, if you want to learn about perception component, search answer hub for "mieszko"

#

such as this thread

#

https://answers.unrealengine.com/questions/331442/pawnsensingcomponent-vs-aiperceptioncomponent.html?sort=oldest

#

@hybrid cipher

hybrid cipher Jan 9, 2019, 1:17 AM

#

haha thanks :) yea I was trying it out and it seemed it wasn't dropping fps so hey why not :)

#

ah yea I read that one

wet iris Jan 9, 2019, 3:23 AM

#

@pine steeple thanks!

echo ether Jan 9, 2019, 4:17 AM

#

@floral mango , okay. I'm not currently implementing anything on my own. But in future i really want to. That's why i asked. Thank you.

echo ether Jan 9, 2019, 10:29 AM

#

@floral mango , I just found other issues. This time i wanted the AI to follow the player. But it's not consistent. It follows the player if position is constant and not changing at the last moment , otherwise it gets stuck after reaching the player location. I just recorded it and you can have a look if that helps. https://youtu.be/BmVJf7Z5rFw

YouTube

kartik j Mayya

AI move to player

▶ Play video

floral mango Jan 9, 2019, 10:31 AM

#

Look at the acceptance radius settings you have

echo ether Jan 9, 2019, 10:40 AM

#

@floral mango , you mean the in task node setting? i changed it to 50 from 20 as it was not working. But still the same result.

floral mango Jan 9, 2019, 11:03 AM

#

You'll have to investigate I'm afraid

echo ether Jan 9, 2019, 11:45 AM

#

@floral mango , It'd be easier if i knew how exactly the navigation system works. I just know the very basic stuff like the red sections block the path and uses octree data structure for navigation data . Can you please let me know why the pawn gets stuck? I mean it's failing to find the path to the location but the task still not aborting. What would be the circumstances that results in failing to find the path?

floral mango Jan 9, 2019, 11:45 AM

#

What does the log say?

#

Most common failure cases will be that either the start or end position are blocked

#

Or the clearance isn't sufficient, and the pawn is getting stuck on the level

#

You won't see anything in the log if the pawn is getting stuck...it'll just get stuck and the task won't complete

echo ether Jan 9, 2019, 11:50 AM

#

@floral mango , after the execution of my custom task it won't display anything.

floral mango Jan 9, 2019, 11:50 AM

#

Is the pawn getting stuck? Is it getting within the acceptance radius? Have you checked the logs?

echo ether Jan 9, 2019, 11:53 AM

#

@floral mango , yes. It's getting within the radius. I also checked the position of the pawn at that point. I think it's slightly above the red section.

#

@floral mango , Suppose if the positions are blocked then how to prevent it from entering those section?

floral mango Jan 9, 2019, 12:44 PM

#

You need to think about how you select positions. There's no built in position selecting system

echo ether Jan 9, 2019, 1:02 PM

#

@floral mango , I think it's entering the red section when it tries to reach the location. But after that it's unable to find the path. Is it possible to make it so the pawn anticipates the red section and prevent going to that block?

floral mango Jan 9, 2019, 1:05 PM

#

It shouldn't be able to move inside the red sections.

#

Unless you're using one of the tasks that updates the last leg of the path to move to the target actor position

unborn jungle Jan 9, 2019, 1:16 PM

#

Would an AI behavior tree be completely equal to a series of bool check that happens on begin play of an AI controller with the selectors being like branch nodes and sequence nodes like sequences?

#

It’s just a completely visual way to represent it?

#

I am finding it hard to justify making an entire new blueprint essentially for single functions (tasks) or different polling functions (services) and having to set up the blackboard variables

#

And it seems much more straightforward to just do it all in the controller

eternal stag Jan 9, 2019, 2:16 PM

#

is there a way to resume a BT branch after it's been aborted?

#

I have been working on getting my AI to open doors

#

what I do is, I set a blackboard key pointing to the door once a nav link has been reached

#

which then aborts the current move action and executes a custom task to open a door

#

https://i.imgur.com/7NvvFlq.png

Imgur

#

the tree is fairly simple for now, but I kinda want the door task to trigger on any move action if possible

echo ether Jan 10, 2019, 3:47 AM

#

@floral mango , "you're using one of the tasks that updates the last leg of the path to move to the target actor position" means? I'm using only 2 tasks one to set the player position and SVON MOVE To.

echo ether Jan 10, 2019, 5:16 AM

#

@floral mango ,

📎 log.png

floral mango Jan 10, 2019, 8:07 AM

#

it says failed to find start nav link, so most likely the pawn is in a blocked area

echo ether Jan 10, 2019, 8:42 AM

#

@floral mango , yeah i know. how to prevent it from entering that section?

#

@floral mango , and still come close to player

echo ether Jan 10, 2019, 11:43 AM

#

@floral mango , is there a way to abort the task if its in the block section by itself?

floral mango Jan 10, 2019, 11:52 AM

#

You'll need to look at the code

echo ether Jan 10, 2019, 12:29 PM

#

@floral mango , i'd very happily do that if i can understand that.

pine steeple Jan 10, 2019, 8:48 PM

#

@eternal stag A task can wait till a Finish Execute is called

#

so why not have an event bound in the task, that when the door is open, you call Finish Execute on the task

#

@echo ether i would just do a check every so often to see if its in that section and call abort task

#

why not use nav modifier volumes to restrict where it can go

#

it wont choose a path if its not allowed to go there

eternal stag Jan 10, 2019, 9:25 PM

#

I found a different way to deal with it

#

I just made my own movetask that uses "Move To Actor or Location"

#

and ends it when an obstacle is reached, creating it again once it has been surpassed

glossy abyss Jan 11, 2019, 1:22 AM

#

I need my AI to make wide turns, like a car or boat (or in this case a dinosaur), they can't turn on the spot, does anyone have any idea how to accomplish this?

echo ether Jan 11, 2019, 5:49 AM

#

@pine steeple , it uses SVON Volume for navigation. So i don't think nav modifier is helpful in that case. I don't know if there is a task called abort in BT. Please correct me if i'm wrong.

pine steeple Jan 11, 2019, 5:54 AM

#

isnt a task

#

but a BT Task wont finish till you call finish

#

so why not just hold a task till your finished?

#

it will stop the BT from advancing

echo ether Jan 11, 2019, 6:06 AM

#

@pine steeple , I'm not getting last two lines. What i wanted was to abort itself if the task fails to find the path. Can please elaborate the last two?

pine steeple Jan 11, 2019, 6:09 AM

#

So you have a callback in whatever navigation you have to abort the task you can bind to it and call abort. Or have a service checking for a call back with sets a bool and you abort the current tree with an observer

#

I do it for my ai. When path fails hits a threshold it fires an event which sets a blackboard bool called Pathfailed and it aborts current tree and runs a recovery to get it back on navmesh or kill it if is too far or under map etc

echo ether Jan 11, 2019, 7:08 AM

#

@pine steeple , okay. I'll try and let you know. Thank you.

echo ether Jan 11, 2019, 12:54 PM

#

@pine steeple , I got it working now. It aborts the task if gets stuck in the blocking section and recalculates the path. Now i can get it follow the player pretty much correctly. Thanks for the help.

floral mango Jan 12, 2019, 2:35 PM

#

@echo ether fixed nav component using controller instead of pawn location https://github.com/midgen/uesvon/issues/8

GitHub

Ensure navigation component uses pawn position, not controller pos...

hybrid cipher Jan 12, 2019, 11:56 PM

#

guys, do any of you know of a neat and quick solution to break AI creating "trains" when following player?

glossy abyss Jan 13, 2019, 12:28 AM

#

@hybrid cipher either RVO or crowd detour controllers

hybrid cipher Jan 13, 2019, 12:29 AM

#

tried both to no avail

#

might just need to tweak parameters then

pine steeple Jan 13, 2019, 2:19 AM

#

@hybrid cipher use EQS

#

generate "chase" positions offset from the target

#

and have the ai follow that location not the actor

hybrid cipher Jan 13, 2019, 2:23 AM

#

Thanks! Sounds like it could resolve my other problem too :)

pine steeple Jan 13, 2019, 2:39 AM

#

i made a eqs test to create a rear cone behind the playuer

#

and it works well

echo ether Jan 13, 2019, 6:11 AM

#

@floral mango , Thank you. Does that work in 4.20 version?

eternal stag Jan 13, 2019, 9:09 AM

#

Howdy again, I am writing my own movement task, in which I want to deal with my controller overcoming obstacles and whatnot. Within this task I wait for them to reach a smart nav link before interrupting regular navigation and trying to make them pass an obstacle. I now want to dynamically spawn the appropiate task in my event graph, how would I go about doing this? I found a bunch two different nodes, but im not certain which one is suitable for me.

#

📎 hSsK71CNoG.png

#

the wiki entries I found didnt go into terribly much detail into what these seem to do

hybrid cipher Jan 13, 2019, 10:22 AM

#

@eternal stag hey if you can read c++ implementation of the nodes can be found in engine files to be 100% sure

eternal stag Jan 13, 2019, 10:23 AM

#

yea, unfortunately blueprint wont let me automatically jump to those for some reason

#

so I didnt quite bother with that yet

#

might manually search em up if it becomes necessary

hybrid cipher Jan 13, 2019, 10:23 AM

#

Aaah crap I knew where that one node you pointed out was

#

Ai controller I think, it seems like a hybrid between move to location method and move to actor

eternal stag Jan 13, 2019, 10:26 AM

#

yea I see abunch of stuff here

hybrid cipher Jan 13, 2019, 10:28 AM

#

Lol yeaaa... Takes a time to get used to it :)

eternal stag Jan 13, 2019, 10:28 AM

#

but isnt a task basically just an actor with a bunch of specialized ticks?

#

Could I just spawn one and initialize a bunch of stuff?

#

or is there more to it that I gotta look out for?

#

mhmm no, not an actor

#

ahhh, it's an AITask, not a BTT task

rare violet Jan 13, 2019, 12:48 PM

#

Anyone implemented advanced cuda programming in their program?

#

I'd love to see examples

near jetty Jan 13, 2019, 2:19 PM

#

@rare violet nope

#

cuda doesnt merge well with graphics

rare violet Jan 13, 2019, 2:44 PM

#

was talking to a PhD student whose thesis was on fuzzy logic

#

anyone done anything in regarding to fuzzy logic?

floral mango Jan 13, 2019, 3:49 PM

#

@echo ether master branch should be fine in 4.20

silent tiger Jan 13, 2019, 3:57 PM

#

@rare violet worked with fuzzy control systems a while ago, but haven't seen the need for it in game dev yet.

rare violet Jan 13, 2019, 4:07 PM

#

@silent tiger Fair enough, because I am studying computer science with AI and this is one of the options I have to study as I was told

quiet dove Jan 13, 2019, 5:32 PM

#

https://twitter.com/Volvary/status/1084250146433630209

Here's a little something I did yesterday

Volvary (@Volvary)

Here it is! Three storage workers, trying to fill their storage with specific ingredients. But there's one Red cube too little for their happiness. All built in Unreal Engine using the Behavior Trees. #gamedev https://t.co/N0rNNY6wY9

▶ Play video

unborn jungle Jan 13, 2019, 11:54 PM

#

Does anyone know what difference in movement the "AllowStrafe" boolean on the ai controller makes?

#

I can't see a difference but it must be doing something

flint trail Jan 14, 2019, 5:52 PM

#

@magic perch just saw your comment on Tom's Utility AI post. How does one work with FSM AI in UE4? (using BP preferably) Are there any tutorials about the subject ?

hybrid cipher Jan 14, 2019, 6:32 PM

#

FSM is not that difficult to code, you only need logic of what happens in the state and condition where to go from there, should be good enough if you just look in general way to code FSM

flint trail Jan 14, 2019, 6:35 PM

#

right, but UE4 has no state machines in BP

#

so coding FSM-like Ai in BP won't be the same as having native support for true FSM

magic perch Jan 14, 2019, 6:43 PM

#

you can implement a state machine in BP though, it's fairly trivial

#

I don't know of any UE4 specific tutorials, but any C based language would easily port across

flint trail Jan 14, 2019, 6:45 PM

#

aye, cool

outer cape Jan 15, 2019, 11:23 PM

#

You know how DetourAIController will make Characters walk around other Characters with that AI Controller?

#

How do you make the Controller also do that for a Pawn controlled by the player?

#

Do you need to make a new AI Controller blueprint to achieve that?

trim laurel Jan 15, 2019, 11:51 PM

#

How can one check if default Behavior Tree tasks are failing? My moveto command isn't working, but I can't figure out if it's failing or if there's a physics issue.

pine steeple Jan 16, 2019, 12:24 AM

#

gameplay debugger

#

or open the behaviour tree and watch it

trim laurel Jan 16, 2019, 12:35 AM

#

Gracias

#

What's the difference between "On Perception Updated" and "On Target Perception Updated"?

#

is it just that one generates an array and one generates a single target?

pulsar cosmos Jan 16, 2019, 6:36 AM

#

Is there anyway to have 30 enemies on screen at the same time without FPS dropping to 30?

patent hornet Jan 16, 2019, 6:37 AM

#

yes

pulsar cosmos Jan 16, 2019, 6:38 AM

#

Any idea how I can do that?

#

At one of my rooms in the level, there are 30+ enemies but FPS drops down to 30 which severely ruins the experience

patent hornet Jan 16, 2019, 6:41 AM

#

that is not a simple qquestion

#

maybe its fixing a single call that is too expensive

#

maybe its fixing 50 small things

#

run a profiler, figure out whats using most resources

#

and try optimize it, then repeat

pulsar cosmos Jan 16, 2019, 6:59 AM

#

Oh ok

#

Profiler. Forgot about that

pulsar cosmos Jan 16, 2019, 7:23 AM

#

It worked! Thanks dude

#

The issue was the multiple point lights casting dynamic shadow

magic jasper Jan 16, 2019, 5:55 PM

#

Anybody have experience with making AI use input to drive objects?

#

Example would be, AI giving input to a vehicle to change steering input for a vehicle

#

PID controller or a spring damper seems like the way to go

#

Just want to know if there are more refined methods

#

Or to keep it simple, turret has a fixed acceleration and max speed for rotation . AI has a target direction it needs to line up with, how much input to apply to land on the target etc.

magic jasper Jan 16, 2019, 11:10 PM

#

Awh yis

#

https://www.youtube.com/watch?v=4n6wdcjlnkU

YouTube

TheJamsh

UE4 Hovertank Game - Gun Towers [PID / PD Controllers]

Experimenting with PID / PD controllers. PD seems to be much more predictable. New weapon framework is coming together nicely! Currently it's just zeroing on...

▶ Play video

gilded tree Jan 16, 2019, 11:15 PM

#

How do I make the behavior tree fire the Animation and the sound fit for the animation at the same time instead of having them fire in sequence? Is there a way or would I need to write up a task for it?

#

https://gyazo.com/8d5bc60c646f07b14727aa8bc87e1da2

Gyazo

hybrid cipher Jan 17, 2019, 12:17 AM

#

hey, you can try to make your own task that does both in the same node @gilded tree alternatively you can probably set Anim notif or some such that will attach the sound to the animation if it's meant to be played every time the animation is played, this might help https://docs.unrealengine.com/en-us/Engine/Animation/Sequences/Notifies

#

@magic jasper I think what you talk about is prediction? you can aim at the last known position, but that won't give you a great result, and you most likely never hit what you want, so it's more interesting to try to predict where the target will be in the moment your projectile is supposed to hit it. Takes some math...is this what you wonder about?

magic jasper Jan 17, 2019, 12:55 AM

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Not quite. The AI needs to rotate the turret by applying inputs, same way a player would

#

Same deal for the tank - so it's a case of working out how much to apply so it doesn't overshoot the target and doesn't oscillate. PID / PD turned out to be a great way to do it

pine steeple Jan 17, 2019, 1:37 AM

#

have the sound play in the animation itself?

patent hornet Jan 17, 2019, 6:48 AM

#

@magic jasper s = t^2 * a / 2, s being the distance, t time in seconds and a acceleration here

#

if neither your start or end velocity is zero, then it becomes s = t^2 * a / 2 + v*t v being the lower of the 2 velocities

#

a being difference from start to end velocity divided by t here

pseudo yew Jan 17, 2019, 1:21 PM

#

yo how do I get my behavior tree to Not revert back to the IDLE move to random point when state is combat firing at player? Basically stop and fire, instead of continue moving and firing?

magic jasper Jan 17, 2019, 2:51 PM

#

That's a ballistics calculation, it doesn't solve the problem of AI deciding how much key input to apply

#

Bu it's solved now anyways

arctic crag Jan 17, 2019, 8:27 PM

#

So I'm writing custom Decorator, Service, and Task classes for my project but I can't seem to figure out why SetOwner is not being called. Has anyone ran into that issue before?

green narwhal Jan 17, 2019, 8:35 PM

#

Not sure whether to ask this in the multiplayer or the AI channel, but guess it's more AI focused - I'm looking at making an RTS which will need fairly simple AI logics (move, attack etc.). What would be a realistic number of AI before performance starts to hit the pan?

#

I know that's a VERY broad question, but I'm wondering if the 800 AI mark is even achievable

#

Have not messed with AI much in unreal just yet, but was thinking of putting logic together for something like one designated leader and then have followers, to try to take the strain off

gilded tree Jan 17, 2019, 10:39 PM

#

@hybrid cipher Thanks for the assistance, making a new task for the function worked perfectly.

patent hornet Jan 17, 2019, 10:51 PM

#

@green narwhal if you don't plan on writing your own movement component, 200ish is as far as you can go

#

CMC eats resources like a hog

#

AI logic itself is insignificant by comparison

green narwhal Jan 17, 2019, 11:00 PM

#

@patent hornet Ah right, for some reason I was always under the impression that the AI systems were what ate the CPU up, I'm confident I can write my own server replicated movement component - thank you!

patent hornet Jan 17, 2019, 11:01 PM

#

its 4ms worth of overlap detection with 150 AI running around

#

with CMC

#

you can make the AI cost more, but you really don't need to 😄

lone abyss Jan 17, 2019, 11:17 PM

#

A custom CMC may ends up costing even more performance ^^

green narwhal Jan 17, 2019, 11:31 PM

#

Hmm I haven't taken a good look at the OOTB movement component so not sure if I could optimise it well or not

#

Only way to find out is by trying, probably failing, crying in a corner for a while then repeating, right 😃

hybrid cipher Jan 18, 2019, 12:39 AM

#

speaking of optimizations, just checking out my AI and I noticed couple of things that I can't quiet understand, figured I could ask ~~
MoveTo task seems to be taking unreasonably long time with 50npcs in the scene (more than 3ms), any thoughts why this could be so or how to go about fixing it?
what is BT search time from profiler data?
is BT tick function execution of services or is it one run of BT?

pine steeple Jan 18, 2019, 1:44 AM

#

to have that much usage with 50npcs, you must be calling MoveTo way too much

#

i have 150 AI, and my moveto barely goes past .8ms

hybrid cipher Jan 18, 2019, 1:46 AM

#

thought move to doesn't get called again until you reach the destination? I don't really limit it in any way

#

that's probably not good ~~

#

so do I get this right? if MoveTo is called it will keep running until you get to designated destination? so you should drop a decorator on it so it doesn't get called over and over again?

pine steeple Jan 18, 2019, 1:49 AM

#

no it should only be called once and remain active till it gets to destination

#

have you verified thats the case?>

hybrid cipher Jan 18, 2019, 1:51 AM

#

not quiet, but I will

#

I have moveTo in custom task, so that could be an issue

pine steeple Jan 18, 2019, 1:51 AM

#

is the task ending all the time and restarting ?

hybrid cipher Jan 18, 2019, 1:52 AM

#

although I was trying out just having simple BT with getting target and then only moveTo node and the result was the same

pine steeple Jan 18, 2019, 1:52 AM

#

cause you shouldnt end that task until the Move is complete

hybrid cipher Jan 18, 2019, 1:52 AM

#

kinda late here, can't check right now ~~

pine steeple Jan 18, 2019, 1:52 AM

#

MoveTo can be expensive

#

as it has to recalc path everytime its called

hybrid cipher Jan 18, 2019, 1:53 AM

#

ah, I see, I will definitely have a look

#

you should share your AI setup btw, lol, would be so cool to see :)

#

I'm too new to this

pine steeple Jan 18, 2019, 1:54 AM

#

mine is complicated

#

i have 15 different types of AI

#

and i use custom made C++ services, decorators and tasks

#

😄

hybrid cipher Jan 18, 2019, 1:54 AM

#

lol I feel like in the end we will all get there at some point

#

:)

timber flax Jan 18, 2019, 5:23 PM

#

Hey guys, anyone know how i can change the height of this?

📎 Screenshot_180.png

#

idk what it's called, but the AI perception isn't detecting my player/other AI when standing behind a low wall

#

so i'd like to either raise it or add another point in the head

pine steeple Jan 18, 2019, 5:24 PM

#

yeah

#

but c++ only

timber flax Jan 18, 2019, 5:25 PM

#

.-.

#

do you at least know what it's called?

#

so i can do some more research on it?

pine steeple Jan 18, 2019, 5:25 PM

#

yup

timber flax Jan 18, 2019, 5:25 PM

#

i'm not familiar with cpp

#

can you... tell me? 😅

pine steeple Jan 18, 2019, 5:25 PM

#

perception system is kinda garbage with BP stuff

#

i had to make lots of custom stuff to make it work nicely

timber flax Jan 18, 2019, 5:26 PM

#

i wish i knew cpp

#

but my entire project is in BP

#

so i can't recode it

#

and i don't have the time required to learn C++

pine steeple Jan 18, 2019, 5:26 PM

#

sop

#

so

#

if (Target.SightTargetInterface->CanBeSeenFrom(Listener.CachedLocation, OutSeenLocation, NumberOfLoSChecksPerformed, StimulusStrength, Listener.Listener->GetBodyActor()) == true)

#

it basically calls a SightTargetInterface

#

which gets the location it can be seen from

timber flax Jan 18, 2019, 5:28 PM

#

makes sense

pine steeple Jan 18, 2019, 5:28 PM

#

but if you dont override that interface

#

it does

#

FHitResult HitResult; const bool bHit = World->LineTraceSingleByChannel(HitResult, Listener.CachedLocation, TargetLocation , DefaultSightCollisionChannel , FCollisionQueryParams(SCENE_QUERY_STAT(AILineOfSight), true, Listener.Listener->GetBodyActor()));

timber flax Jan 18, 2019, 5:28 PM

#

so it just gets the center of the actor?

pine steeple Jan 18, 2019, 5:29 PM

#

yep

timber flax Jan 18, 2019, 5:29 PM

#

well then i can place an invisible cube above the actor

#

.-.

#

😅

#

that's such a messy solution

#

but ah well

pine steeple Jan 18, 2019, 5:29 PM

#

yeah i overrode the interface

#

cause i have different size "monsters"

timber flax Jan 18, 2019, 5:30 PM

#

yeah

#

i'd rather do that too

#

but i don't think there's a way to do that

#

at least in a BP only project

pine steeple Jan 18, 2019, 5:31 PM

#

no has to be C++

timber flax Jan 18, 2019, 5:31 PM

#

is there any way to get a singe c++ class for just that?

pine steeple Jan 18, 2019, 5:31 PM

#

cause you need to implement the interface into the actor class

timber flax Jan 18, 2019, 5:32 PM

#

i know i can create a c++ class

pine steeple Jan 18, 2019, 5:32 PM

#

yeah create a C++ class based on Character, and reparent your character bp to it

#

it should "work" just like normal

timber flax Jan 18, 2019, 5:32 PM

#

hmm... ok

pine steeple Jan 18, 2019, 5:32 PM

#

but no guarantees 😄

timber flax Jan 18, 2019, 5:33 PM

#

c++ be like that :p

pine steeple Jan 18, 2019, 5:33 PM

#

im just wondering if its really worth it

#

how tall are these walls?

timber flax Jan 18, 2019, 5:33 PM

#

waist height

#

it's a realistic FPS

#

so they're rather important

pine steeple Jan 18, 2019, 5:33 PM

#

so the trace should go over the top right?

timber flax Jan 18, 2019, 5:33 PM

#

yeah

#

it goes over the top of the wall

#

and the detection point is just below the wall

#

but i can't have the wall be just low enough for the detection point to be over it

#

because then crouching does nothing

pine steeple Jan 18, 2019, 5:34 PM

#

so you want it to be from the pawn eyes

timber flax Jan 18, 2019, 5:34 PM

#

yeah,

pine steeple Jan 18, 2019, 5:34 PM

#

rather than the center

timber flax Jan 18, 2019, 5:34 PM

#

ideally there'd be 2 detection points

#

one where it is now and one at the eyes

#

but i have no idea if that's possible

pine steeple Jan 18, 2019, 5:34 PM

#

not possible really but eyes would work for all cases

timber flax Jan 18, 2019, 5:35 PM

#

yeah, eyes would be fine

pine steeple Jan 18, 2019, 5:35 PM

#

thats how i do mine

#

from its head basically

timber flax Jan 18, 2019, 5:35 PM

#

yeah, exactly

pine steeple Jan 18, 2019, 5:36 PM

#

not much more i can suggest really

#

like i said the perception system is kinda broken

#

with BP intergration

timber flax Jan 18, 2019, 5:36 PM

#

yeah

pine steeple Jan 18, 2019, 5:36 PM

#

all my perception stuff is handled in c++

timber flax Jan 18, 2019, 5:37 PM

#

i made a c++ class

#

just a standard character

pine steeple Jan 18, 2019, 5:37 PM

#

https://gyazo.com/0fc4468b53c1215dde2f123365a346e7 <

Gyazo

#

had to write that just to get normal name for senses 😄

timber flax Jan 18, 2019, 5:37 PM

#

.-.

#

yeah i've heard teams are also handled solely in c++

pine steeple Jan 18, 2019, 5:38 PM

#

yup

timber flax Jan 18, 2019, 5:38 PM

#

which makes me sad, i'm using a workaround that uses tags

#

which is so annoying to work with

pine steeple Jan 18, 2019, 5:38 PM

#

altho we dont use teams for the perception system

#

as its multiplayer co-op game

timber flax Jan 18, 2019, 5:38 PM

#

well even then

pine steeple Jan 18, 2019, 5:39 PM

#

and AI skip any perception if the listener is another AI

timber flax Jan 18, 2019, 5:39 PM

#

welp, looks like it's time to get tom looman's tutorial out again

#

yeah, i want to have both friendly and enemy AI

#

so i need a team system

pine steeple Jan 18, 2019, 5:40 PM

#

yeah i think teams are in PlayerState

#

not to sure tbh, but i think it checks Team == Team for Friendly, Team != Team for enemy, no check for neutral iirc

timber flax Jan 18, 2019, 5:40 PM

#

i know a bit of python, so that helps sometimes

#

but i've never really gotten anywhere with c++

#

i guess there's no time like the present .-.

pine steeple Jan 18, 2019, 5:41 PM

#

PerceptualInfo->bIsHostile = AIOwner != NULL && FGenericTeamId::GetAttitude(AIOwner, SourcedStimulus->Source) == ETeamAttitude::Hostile;

#

{
    const IGenericTeamAgentInterface* TeamAgentA = Cast<const IGenericTeamAgentInterface>(A);

    return TeamAgentA == NULL || B == NULL ? ETeamAttitude::Neutral : TeamAgentA->GetTeamAttitudeTowards(*B);
}

#

so it calls a IGenericTeamAgentInterface

#

to get the team

#

its on

timber flax Jan 18, 2019, 5:42 PM

#

makes sense

pine steeple Jan 18, 2019, 5:42 PM

#

if that helps you with teams

#

😃

timber flax Jan 18, 2019, 5:42 PM

#

:)

#

thanks for all the help

pine steeple Jan 18, 2019, 5:44 PM

#

np if you get stuck, @ me

#

lol

#

whoops i pinged someone (shoosh)

timber flax Jan 18, 2019, 5:51 PM

#

thanks, i appreciate that :)

#

i bought a tutorial series from tom looman on c++ a while ago

#

never finished it as i got what i needed from it

#

time to go do it all the way through i guess

grand isle Jan 19, 2019, 9:23 AM

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Hi guys. Does anyone has any sort of clue on how to create flyer AI pathfinding?

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I'm thinking copying EnvQueryTest_Pathfinding but cut the path validating part

unborn jungle Jan 19, 2019, 3:42 PM

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Should you be using the tickbox "Project Destination to Navigation" on the Move to location node for AI?

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It seems sometimes my AI get stuck and don't move when they should, but having this checked seems to fix it

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Is it greatly more expensive or something?

pine steeple Jan 19, 2019, 7:26 PM

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its not "greatly" expensive

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but it will cost more to do

eternal stag Jan 20, 2019, 1:49 PM

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just a minor annoyance of mine, for some reason I have to manually rebuild paths in my level every time I fire up the editor, is there something configured wrong on my end?

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fresh restart just has my AI try to dash directly towards the goal instead of navigating the level properly

fallow hound Jan 20, 2019, 6:39 PM

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@grand isle there is a free flying pathfinding plug in on the marketplace, probably a good code base to learn from or use.

brittle flare Jan 20, 2019, 9:47 PM

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What settings do I require in order to use basic AI? I current have a black board and behavior tree that is exact to the "https://www.youtube.com/watch?v=nshHCycft4A&t=1431s" tutorial at 45 minutes

YouTube

UnrealEngine

Getting Started with AI | Live Training | Unreal Engine

Announce Post: https://forums.unrealengine.com/showthread.php?135116 Mieszko Zilenski is back in action with Alexander to talk about how to get set up in UE4...

▶ Play video

#

I also currently have a NavMeshBoundsVolume, however my character class I made a BoxComponent the rootcomponent but all collision has been toggled so i am uncertain

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Is there something obvious I am missing

brittle flare Jan 20, 2019, 10:27 PM

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So I ended up using the Player that comes with the template and got some functionality

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Now I am wondering what components are necessary in order to use a customized character

ripe whale Jan 20, 2019, 11:51 PM

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Does anybody know if there is a method to query the AIController or movement compoenent or something for the last requested move to location? I want to create an animation transition where my character transitions to a new state once they are close to the destination

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I just tried using GetImmediateMoveDestination() but it seems that the move destination changes multiple times for each call to simple move to in blueprints

ripe whale Jan 21, 2019, 1:36 AM

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nm I figured it out

umbral raven Jan 21, 2019, 2:26 AM

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Howdy dudes I've started learning UE4 and I have a game in mind that I want to start working on once I feel I have enough knowledge to do so. One thing I'm wondering is: how difficult would it be to code an AI (Using Blueprints as normal scripting languages just blow my mind.) that will follow a player until ordered to do things like attack, hold position, etc.

hybrid cipher Jan 21, 2019, 3:11 PM

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hey @umbral raven it depends, there are some starter tutorials to show you how AI can follow a target, so it can be copy paste, but it all depends on how complex you want your stuff to be. If you will be using behavior trees to drive your AI, you can combine that with blueprint tasks and services and such for your convienience. I think with AI design is a tad more difficult to come up with than to code it all in, but it's all about practice

wanton oriole Jan 21, 2019, 5:42 PM

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Hey guys! So I'm working on some AI that has to move to different locations using a navmesh. I want it to look as realistic as possible, so I'm facing some problems.
First, do any of you know of a good way to smoothen out the path that the ai is walking on? In this article they are talking about exactly that, but I don't really get how they solved the problem: https://www.unrealengine.com/en-US/tech-blog/a-layered-approach-to-ai-locomotion-in-the-occupation

Unreal Engine

A Layered Approach to AI Locomotion in ‘The Occupation’

White Paper Games Technical Artist James Burton shows the process used to create the locomotion system of the AI characters in the upcoming game ‘The Occupation’.

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Also here is a picture. The red path is the one he is walking now. But it should look more like the blue one

📎 unknown.png

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I drew the blue path a bit wrong, but you get the point xD

umbral raven Jan 21, 2019, 7:29 PM

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@hybrid cipher Thanks for that!

hybrid cipher Jan 21, 2019, 7:31 PM

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no problem

stable void Jan 22, 2019, 1:05 PM

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@wanton oriole thank you for the link, very informative, please let me know if you figure it out !

#

Does anyone know why a behavioural tree would work on itself but do nothing when called using "run behaviour" ?

📎 behaviordoingnothing.png

stable void Jan 22, 2019, 4:09 PM

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for the future generation searching for this: behaviour trees parent and child have to share the same blackboard to function properly

pine steeple Jan 22, 2019, 7:13 PM

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@stable void yeah i had that issue when i first used inherited BT

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you cant split the blackboard, BUT you can set the BB root to the derived BB

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and use that

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but you cant use a different BB

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if that makes sense

silent tiger Jan 22, 2019, 10:32 PM

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@wanton oriole you could simply go through the red path, calculate the angles between segments and add new points to smooth the hard angles. Just be careful that the new points are on the navmesh.

patent hornet Jan 22, 2019, 11:55 PM

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add new points to what? path that gets recalculated regularly? each time its recalculated?

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that would be a serious pita to code in

gilded tree Jan 23, 2019, 5:58 AM

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You could make a new task that would clamp the angle of the moveto using the actors rotation + an extra value to get the degrees he should rotate to the new point. One issue would be that the ai could circle off to the wrong side, I'm not sure if we can reference a future moveto node? ;)

stable void Jan 23, 2019, 9:43 AM

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@pine steeple no, I don't think I get you , could you go on more detail please ?

gilded tree Jan 23, 2019, 2:57 PM

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How do I stop a playing animation when a new task is being run in behavior trees? For example, my AI is searching for me. It pauses to run an animation where it looks around itself. Mid-animation it spots me and it should stop the searching animation and just go straight into chasing me down, resuming its normal anim BP, but in my case it moves the AI towards me, but the animation is still being run. I.e feet standing still etc.

lyric flint Jan 23, 2019, 3:05 PM

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you might need to force the animation change in your animation blueprint

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you should make a "cancel current animation" node in your behavior tree

pine steeple Jan 23, 2019, 3:34 PM

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@gilded tree you need to look into montages, montages can be canceled and allow the normal anim bp to take over

gilded tree Jan 23, 2019, 3:41 PM

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Well, I have a custom task for running both my animation and a sound at the same time. This is what it looks like.

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https://gyazo.com/3ad86e02f300908e350c67dd13a89484

Gyazo

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The false pin works fine after the animation cancels and the task is done it returns to the anim BP, but if the AI is in combat (spots me during the animation) it doesn't stop the animation

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@pine steeple @lyric flint

pine steeple Jan 23, 2019, 4:09 PM

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toggling animation mode isnt the approach you want

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why not play a montage and cancel it when spotted?

#

also why are you changing animation mode with a montage

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you simply play montage, when spotted cancel montage, no need to do anything else

gilded tree Jan 23, 2019, 4:21 PM

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Yeah, I've tried that already, but the animation keeps playing if the AI spots the actor during the animation. Beats me tbh 😅

pine steeple Jan 23, 2019, 4:32 PM

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tried what?

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the montage will end as soon as you call Stop Montage

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you also changing the Animation mode, why?

gilded tree Jan 23, 2019, 4:34 PM

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I changed the animation mode in an attempt to force the AI back into its correct animation mode and leave the montage, but the montage is played "on top" so it's obsolete

pine steeple Jan 23, 2019, 4:36 PM

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i am a bit confused

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why not use the correct play montage node?

gilded tree Jan 23, 2019, 4:36 PM

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If AI is in combat returns true it should stop the montage immediately and return to chasing the actor.
If AI is in combat returns false it should run the montage

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That's my logic, although I'm not getting that to work. Isn't that the correct method? Nevermind the animation modes and all that, that was just me testing around.

pine steeple Jan 23, 2019, 4:38 PM

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https://gyazo.com/dc9f5ad7d1daf777ef196102f22edef7

Gyazo

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i mean that will replay the montage

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https://gyazo.com/f31f3f35d1305d8b3134011bebc19b3e

Gyazo

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or like that

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not reallyt

#

sure what you are doing or after

#

so im just guestimating

gilded tree Jan 23, 2019, 4:43 PM

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Alright, I'll give that logic a shot

#

Well let me break it down

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AI patrols an area. The AI spots and chases the player. If the AI loses sight of the player, it will run a "Looking around" animation. Once the animation completes the AI returns to patrolling the area. However, if the AI spots the player during the animation it should cancel the animation and start chasing again. I've had an issue with this before where AI got stuck in an animation while moving around, so I really gotta nail this one down haha 😉

#

Thanks for your time 🙂

pine steeple Jan 23, 2019, 4:49 PM

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well how is your BT setup

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also how do you tell that task that a player has been spotted?

#

does it just "abort" the task when player is spotted?

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if so why not cancel the montage in the Abort event?

gilded tree Jan 23, 2019, 4:51 PM

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Hmm let me give that a shot

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And yeah

pine steeple Jan 23, 2019, 5:07 PM

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does the Stop Montage get called?

gilded tree Jan 23, 2019, 5:25 PM

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Okay, so there's the issue.

#

The true of the branch never executes

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Even if it spots the actor, so the boolean Im using is probably set wrong somewhere... hmm

pine steeple Jan 23, 2019, 5:25 PM

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ofc

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its checked as soon as the montage is playing

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and false is called straight away

gilded tree Jan 23, 2019, 5:39 PM

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Alright, so it beats me how to make the true react, I think I've just been staring at this issue for too long and begun getting mindbamboozled hehe.

gilded tree Jan 23, 2019, 6:48 PM

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okay I fixed it, I had the attacking task cancel all anim montages. gosh, finally 😃 thanks for the help, @pine steeple

pine steeple Jan 23, 2019, 6:51 PM

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you play your walking through Montage?

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o_0

#

recipe for disaster

gilded tree Jan 23, 2019, 7:03 PM

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No I don't, but the Attack task is what cancels out the Searching task, so like you said I stopped all montages in the aborting task.

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Which worked perfectly. 🙂

pine steeple Jan 23, 2019, 7:04 PM

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cool

#

glads its fixed

hybrid cipher Jan 23, 2019, 10:34 PM

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hey guys, a question about checking if path exists in UE navigation, know there are couple of methods to do this, but based on what does the system decides if it's true or not? is it only for static objects, or moveable objects too? if so, do moveable objects need to have something check liked "affect navigation" etc.

robust bridge Jan 23, 2019, 11:45 PM

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Has anyone here looked into making detour agents actually affect nav corridor planning?

#

@hybrid cipher What do you mean? You can poll the navigation corridor from detour if you want to. That corridor is calculated from the navmesh itself

#

If you activate Affect navigation on a primitive, you can make that primitive change the navmeshes either by introducing difficult terrain, or punching a hole in it completely, and this will of course affect any navigation corridors you try to generate

#

Beware though, as any time you modify the navmesh (for example by introducing a new primitive with affect navigation, or toggling it on / off you will force a local rebuild of the navmesh and this will invalidate previous paths, possibly causing hitches in agents' movement

#

This kind of ties into what I'm playing with right now.

hybrid cipher Jan 24, 2019, 12:07 AM

#

well I have ai using detour and there's a lot of them so I kinda wanna check if the destination of that AI is reachable (it's FVector at this point), for some reason decorator PathExist always return false (weirdly enough when I inverse the condition, it's still false)

tried using custom decorator with TestPathSync and it's the same, so I'm kinda...buffled, just trying to understand how the engine checks whether the destination is reachable or not

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I don't really want to recompute navmesh, nor should AI actually collide among one another (they will use detour tho)

echo ether Jan 24, 2019, 6:04 AM

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@floral mango , hey. Is it possible to make the AI to move to random points using SVON Volume? I mean, if you are using Navmesh then you can use random point in navigable radius. Can we do something similar in SVON volume?

floral mango Jan 24, 2019, 7:25 AM

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@echo ether there's no function to select a random navigable point right now. I do have some simple code sat locally to flood fill for a navigable position but have been mega busy and not had time to finish it

echo ether Jan 24, 2019, 9:11 AM

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@floral mango , it's okay. Please let me know when you put that in the plugin. I'll keep try keep working around then.

echo ether Jan 24, 2019, 12:17 PM

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Hey guys, can anyone please tell me how decorators work properly? I put a blackboard decorator on the task and set to abort self. But the task is not aborting. but if i put the same blackboard decorator on the left most of the task then it shows that the current task will be aborted of result change. Anyone knows why? By the way , these nodes are branching from sequence nodes.

📎 BT.png

south prism Jan 24, 2019, 2:19 PM

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Why is the "CanSeeEnemy" not working on my AI Behaviortree as Blackboard Condition? The AI should check every other AI and if its a different team, it should make the boolean "CanSeeEnemy" in my Blackboard to true.

📎 AIController.PNG

stable void Jan 24, 2019, 3:48 PM

#

📎 Filtera.PNG

#

@pine steeple

📎 filterc.PNG

#

📎 filterb.PNG

#

here is the setup, it's really simple

#

basically the npcs move with that filter and the playable character is setting the position of the filter with the sphere

#

it works but everything is affected

pine steeple Jan 24, 2019, 3:58 PM

#

so what is your desired outcome

stable void Jan 24, 2019, 4:05 PM

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for the NPCs to walk around my PCs

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@pine steeple

pine steeple Jan 24, 2019, 4:17 PM

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right so that sphere is attached to PC?

#

and that navfilter is on the NPC?

#

@stable void

stable void Jan 24, 2019, 4:18 PM

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@pine steeple yes

pine steeple Jan 24, 2019, 4:18 PM

#

you want the NPC to be exluded

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from pathing in that navarea

stable void Jan 24, 2019, 4:19 PM

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yes

pine steeple Jan 24, 2019, 4:19 PM

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so tick the box Excluded

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unless im getting confused 😄

stable void Jan 24, 2019, 4:21 PM

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ok I just tried that and UE4 jcrashed .. haha. i'll try again

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no, the filter is still effecting everything sadly :/ @pine steeple do you know what all the flags ticks are all about ? Or where I can find some documentation ? I can't seem to find anything helpful

pine steeple Jan 24, 2019, 4:45 PM

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flags are strange, let me see if i can find a doc on it

south prism Jan 24, 2019, 5:09 PM

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@pine steeple can you help me there?

robust bridge Jan 24, 2019, 10:40 PM

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sigh..

#

hm

#

If you change the nav mesh area class you cannot avoid recalculation, which breaks smooth pathfinding. But doing agent aware corridor prediction seems to not really be a good solution either

#

Stuck!

#

Any insight from AI gurus? 😄

#

Maybe the solution is to disable automatic recalculation, set some frequency and just go nuts with the filters?

#

Maybe only allow recalculation when agents are a certain distance from a path corner

copper nebula Jan 24, 2019, 11:14 PM

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@stable void why not use the booleans as isFlagIncluded, then you only need half of all those booleans?

pine steeple Jan 24, 2019, 11:42 PM

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@copper nebula that is engine defaults

crystal grotto Jan 25, 2019, 10:30 AM

#

Each time i start UE4 i have to build Pathsagain, before the NavMeshBoundsVolume works correctly again. Is this always like this or am i doing something wrong ?

pine steeple Jan 25, 2019, 6:19 PM

#

@crystal grotto it happens in our project

#

we eliminated some issues by ensuring the bounds is on the Peristent level

crystal grotto Jan 26, 2019, 4:14 PM

#

@pine steeple I still can't fix the problem :(
Do you have any advice for me ? :/

pine steeple Jan 26, 2019, 4:45 PM

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@crystal grotto no not really, i just get used to having to build paths

crystal grotto Jan 26, 2019, 4:46 PM

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Yee, that would be also not a real problem for me.
The big problem is that even when i try to build a release version it's still acting like it isn't builded Rip

#

Did you tried it ?
Maybe you have the same big problem as me

pine steeple Jan 26, 2019, 4:47 PM

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oh we dont have that issue

#

not in cooked builds

#

just in PIE

crystal grotto Jan 26, 2019, 4:47 PM

#

Alright

pine steeple Jan 26, 2019, 4:48 PM

#

maybe your generation settings are set wrong

#

or something

#

you using nav invokers?

crystal grotto Jan 26, 2019, 4:48 PM

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I don't really know what nav invokers is 😅

pine steeple Jan 26, 2019, 4:49 PM

#

thats a no then, show me your project settings

#

for Navmesh and Nav system

crystal grotto Jan 26, 2019, 4:51 PM

#

📎 unknown.png

pine steeple Jan 26, 2019, 4:54 PM

#

hmm

#

only major diff we have is we use Dynamic

#

instead of static for navmesh

crystal grotto Jan 26, 2019, 4:54 PM

#

Worth a try 😄

#

Still the same problem with the build paths while in editor.
Making the release version to try it would take some time

pine steeple Jan 26, 2019, 4:56 PM

#

oh, just do a cooked debug build

#

and launch standalone

#

its quicker and will have the same effect as release (regarding navmesh)

crystal grotto Jan 26, 2019, 4:58 PM

#

Uhm, where can i select again the standalone version ?
I was there already once, but i forgot where it was

pine steeple Jan 26, 2019, 5:05 PM

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just cook build i think

#

i compile the binary via Visual studio

#

and just cook content

crystal grotto Jan 26, 2019, 5:18 PM

#

Well, i tried it. Still the same 😭

#

If i can't fix this problem it's Rip for my game

#

At least for the public version 😐

south prism Jan 26, 2019, 6:00 PM

#

Someone can help me? If my AI see one enemy, it set it to CanSeeEnemy and if the enemy die it should set it to false for the AI behave tree. And another issue is, that if 2 enemys are in his range and he kill one, then it dont attack the other one and just stand still. Hope someone can help me

📎 AIController.PNG

lofty remnant Jan 26, 2019, 6:51 PM

#

Anyone got info on the DetourCrowdAIController? I can't seem to create a custom C++ child of it. Is this an established feature? I found these :

#

https://forums.unrealengine.com/development-discussion/c-gameplay-programming/118639-adetourcrowdaicontroller-in-c

Unreal Engine Forums

For gameplay programmers writing C++ code.

#

https://answers.unrealengine.com/questions/581485/detourcrowdaicontroller.html

#

https://answers.unrealengine.com/questions/603620/adetourcrowdaicontroller-error-lnk2019.html

hybrid cipher Jan 26, 2019, 7:21 PM

#

@lofty remnant hey I think deourCrowdAIController doesn't really do that much, right? Are you just trying to use detour avoidance or is there more you need from it?

lofty remnant Jan 26, 2019, 7:22 PM

#

@hybrid cipher For now I just need avoidance of a large mob of actors. Just walk to keep them from walking over each other.

#

I've replace my AIController's PathFollowingComponent with a UCrowdFollowingComponent, but I can't seem to figure out how to configure it.

#

SetCrowdAvoidanceQuality() and other methods appear to be inaccessible.

hybrid cipher Jan 26, 2019, 7:31 PM

#

you can set up the avoidance parameters via Project Settings->Crowd Manager

lofty remnant Jan 26, 2019, 7:32 PM

#

@hybrid cipher I've seen those, but not sure what to make of them, even after looking at : https://answers.unrealengine.com/questions/212408/crowd-manager-avoidance-config.html

hybrid cipher Jan 26, 2019, 7:32 PM

#

it's a bit of a magic lol

lofty remnant Jan 26, 2019, 7:38 PM

#

NVM... uggh I hate intellisense. I needed to disable it forever ago. It was telling me the config methods were private.

#

But It builds now.

crystal grotto Jan 26, 2019, 7:39 PM

#

@pine steeple I found a solution to not always build the paths when starting UE4.
If you press at the RecastNavMesh-Default (thing which gets automatically generatet when you create a NavMeshBoundsVolume ) you can check the option (under Runtime) Force Rebuild on Load.

But i still can't get it working when i wanna release my game 😦

south prism Jan 26, 2019, 8:25 PM

#

pls someone know the answer for my question? I didnt figured it out since 3 days

lofty remnant Jan 26, 2019, 8:38 PM

#

@hybrid cipher even though I've configured my CrowdFollowingComponent my AI still aren't avoiding each other. Any thoughts as to why that may be?