Interaction System - Trace Area - Unreal Engine 5 Tutorial [UE5] #1

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We're going to set up a character component that will trace an interaction area actor.
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00:00 Introduction
00:54 Interaction Area
02:35 Trace Component
14:40 Outro
#ue5 #unrealengine #niceshadow

[@edp180perkie03]

I'm really new to all this but for anyone else in my position, I'm doing a third person game and drawing the line trace from the camera feels really unnatural so around 7:20 so here's how I set mine up.
Go into your character skeleton and add a socket where you want the trace to come from, I'm using Manny and did Spine04 as it's pretty central, then in the trace function:
Trace -> Cast to your character BP -> Line Trace by Channel.
Get Player Character -> Cast to character BP (Object), (As Character BP) -> Get Actor Rotation (as in video)
Cast to Character BP (As Character BP) -> Get Mesh -> Get Socket Location (In Socket Name = your socket name from character skeleton), (Return Value) -> Line Trace Start & the add node as in the video
Hope that makes sense, and helps someone!

[@Smile........]

Thanks a lot!

[@draicor]

I love the way you explain things mate, amazing content

[@liketobe2743]

Really nice Tutorial!
I watched a lot of other Tutorials for Interaction systems and i had huge trouble to implement them on my Character since they are over simplified or not explaining the details not enough if they are more complex. Yours is just brilliant. Longer road but now I understand actually trace function better which is worth so much more.

[@stromoedit1657]

man you dont even know how helpfull this is awesome tutorial 👍

[@jonklemenc]

Awesome!

[@imateria9088]

thank you!

[@InkFold]

I think it makes way more sense to put an actor component blueprint that simply checks if the player is nearby, and that their camera forward vector is facing toward their world position. You could have it check like 10x per second... Although I'm not sure how performance would be affected with multiple objects making the same check versus the player checking 33x per second. Not sure. This is an interesting setup though!

[@onx2rj]

How do you suggest making this work well with 3rd person?

[@benjaminzarkhin1293]

From your description I'm realizing this is oriented towards multiplayer integration, and on single point of interaction. What if I wanted to be able to set up a interaction "radius", in which you want to interact with something to your side or even behind you?

[@Dennis-np2dn]

You would work with objects that you're overlapping with instead of a linetrace. What you could do is create an interface, assign that interface to the interactable objects and then in the player bp use the nodes "get overlapping actors" and after "does implement interface". Hope that helps :)

[@winterfluss7556]

Hi, thanks for the great tutorial. Unfortunaly I am facing the same problem as Mr.Smidge. I already have a "EventBeginPlay"-Node in my ThirdPersonCharacter blueprint so I can't creat a new one. And I can't connect the "SetupIntractionTrace"-Function with the already existing one without breaking its connection to the movement system of the blueprint. So I created a "CustomEvent"-node like Mr.Smidge did. But nothing happend. I followed your tutorial up to the point where you check the line trace. So in my opinion I should see the red line of the line trace when playing. Do you have any ideas why? Best regards

[@NiceShadow]

Hi, only creating a custom event does not execute the event. But you don't need the custom event. That you cannot connect the SetupIntractionTrace function to the existing EventBeginPlay (because of the movement system) is not true. You can connect it after the AddMappingContext node. Or as an alternative you can connect the EventBeginPlay directly with a Sequence node. The first pin of the Sequence could trigger the movement system stuff and the second Sequence pin can trigger the SetupInteractionTrace function.

[@winterfluss7556]

@@NiceShadow Hi NiceShadow, I really appreciate your fast and detailed answer. It works great, even in third person. I just extendet the "length"- float variable in the AC-InteractionTrace up to 1000 and everything is fine. Thanks for your respond and many thanks for your tutorials.

[@DaggerDaggerYT]

Thank you for the added context. I was wondering why this wasn't working in third person but adding the SetupIntractionTrace after the AddMappingContext node worked for me. solid work. @@NiceShadow

[@shizzy2199]

how do you create 2 event begin play because the default bp thirdperson character already has a event begin play and wont let me make a new one and if i use the one that is already on there it makes it were i cant move

[@NiceShadow]

You don't need 2 event begin plays. You can create a custom event instead and let the EventBeginPlay additionally execute this custom event

[@jacklawrence2221]

is linetrace based interaction more performance saving than those using collision?

[@draicor]

sometimes, you want to interact with an item you are looking at.. imagine if you are colliding with several objects at the same time, how would you sort which one to interact with? the closest one? take a look at resident evil 2 remake system, it uses the collision to highlight which items you can interact with, and the trace + interact key to actually use that item.

[@Mr.Smidge]

6:16 i placed down a Custom Event because i already had a EventBeginPlay node and it would just zoom on to that one, that should be a problem right?

[@NiceShadow]

That's no problem :)

[@DaggerDaggerYT]

Had the same question

[@johnaycliffe8162]

Hello I wanted to ask which version of Unreal is this? The line trace keeps aiming towards the corner of the third person demo map for some reason in 5.3.2 and I don't know why. Any help would be appreciated!

[@NiceShadow]

I don't think that's an unreal version problem. The version used in this tutorial is 5.0

[@eruakin5293]

what about line traces when you have two perspectives? fps and tps??

[@NiceShadow]

as the trace show in the video starts at the general camera location it works for both, first and third person. But for third person your probably need to increase the trace length a bit

[@eruakin5293]

@@NiceShadow i figured it out but thanks anyway man.. appreciate it

[@user-yk9jh2mn8f]

When i start the simulation my lines dont follow my camera but are drawn from my character to a fixed point on the map

[@Bukin-xz6sr]

You need to check, maybe you just didn't add the add note with your forward vector after multiplying and your actor location

[@estagiarioyt]

Your videos are very good, but you could improve by removing the silences.

[@NiceShadow]

Thanks, which silences? or do you mean removing background noise?

[@estagiarioyt]

@@NiceShadow Periods where you don't say anything or like so.... amm....

[@NiceShadow]

@@estagiarioyt That could be good for some people to get it more compact but for others it would feel too rushed though everything. And personally I think it would destroy the flow a bit becuase if I would do it strictly there would be many cuts (would also be more cutting work ^^). So I think I should rather use the time to create new tutorials and get better/more experienced in explaing and I am sure than I can also reduce the "amm"s

[@katiekaliber]

@@NiceShadow I had no problem with how you spoke and you explained everything well and clear. This comment is just nitpicking to be honest, on information given away for free nonetheless. We want to follow along and sometimes need the time to process what has been done in our own project anyway. Appreciate the video and will def check out more. Thanks.

[@edp180perkie03]

I need the silences so I can keep up! :D

[@user-gn8gr2qm4o]

Your videos put me to sleep.