Questions tagged [unreal-4]

Unreal Engine 4 is a professional suite of tools and technologies used for building high-quality games across a range of platforms.

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Multiplayer game server headerless (Unreal/Unity) vs Custom Maps

I've been pondering about different approaches that a multiplayer game server can be managed and programmed. For instance some of the big engines like UE4 & Unity provide a 'build' flag that can ...
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1answer
55 views

Unreal member variables reset between function calls

I'm trying to make a weapons switching mechanic in my game. My implementation is a data asset that contains an array of weapons with each weapon contatining the meshes, stats and a weapon actor ...
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1answer
360 views

In Unreal why is it safe to access a UTexture2D's properties from the render thread despite the documentation stating this is not allowed?

I've been trying to implement something that will update textures on the render thread from a background thread. And from what I've read of the unreal engine documentation you should never access a ...
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1answer
802 views

How to run 'Call in Editor' Functions that are implemented in Level Blueprints?

I have a Blueprint Function within a Level Blueprint, marked as Call In Editor. How can I ...
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1answer
34 views

How to collect objects from map in blueprints

I have a plate with trigger(TriggerVolume) on it. When it overlapped cubes from map deleting. I've manually created references on cubes in blueprint to delete them but it seems very hard-coded. Is ...
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6answers
4k views

Unreal Engine 4 - AI MoveTo always fails

I try to move a character with AI MoveTo, but it always fails. I tried to do this with standart ThirdPersonController and a custom one. The blueprint is simple When the event happens, it starts ...
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1answer
3k views

How can I expose material parameters in the Unreal level editor?

Is there a way to expose material parameters in Unreal 4 so that they are accessible from the level editor? As far as I know, I can only do this through the Material Editor, but I wish to do it more ...
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1answer
661 views

Mesh turns black after baking light

I had to port a project from Unity to Unreal which relied mostly on baked lighting. When I baked the light (StaticMeshActor set to Static), the 3D model in the map turned black. Without bake (...
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2answers
563 views

How to find the client's monitor valid refresh rates with Unreal Blueprints?

I am making a settings menu. This includes a combo box where you can change the refresh rate setting. How do I find out the maximum allowable refresh rate of the ...
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1answer
881 views

Why can't this event call its parent event?

It's me... Back again... with another Unreal problem... I have an Event in my Parent Class called ...
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0answers
48 views

UE4 tips how to handle Minigolf Multiplayer

Heyo! I'm doing a Minigolf multi-player game right now. What I couldn't figure out by now is how to set up the game logic of the actual game. So where to keep track of all players being in bounds, ...
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0answers
22 views

Why can't CreateEvent be used as a value in a blueprint Map?

I need to map Button to Event, seeing as Unreal does not allow me to call premade events (in this situation, ...
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1answer
389 views

How to apply saturn's ring texture in Unreal Engine 4?

I'm working on a "solar system" model project. And while trying to apply saturn's ring texture which is this one : it ended up looking like this: I'm new to UE4 and this branch in general. So I ...
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80 views

What is the equivalent node in UE4 for Blender's Musgrave Node?

I'm trying to recreate Poliigon's non-tiling nodes https://www.youtube.com/watch?v=-VgtSL5ZpYc, in UE4, and the only thing so far I don't see the equivalent to is the Musgrave node https://docs....
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35 views

High quality specular reflections on Android

I opened the Unreal Editor VR example, imported the TwinMotion materials and set the floor to a nice parquet. In the editor it looks like this: However when I run it on my Oculus Quest it looks like ...
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0answers
28 views

What is the better form of movement for a vehicle that the player is inside of?

I am using unreal engine 4 to make this. Basically I have a submarine that the player can move around in and can control the submarines movement within an ocean. However I don't know the best way to ...
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1answer
485 views

Why can't UObject derived objects call BlueprintFunctionLibrary functions?

My question is a very simple one. Why can't UObject derived classes (direct inheritance) call functions from Blueprint Function Libraries? __ Edit: My question relates to Blueprints only. An <...
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0answers
14 views

Unreal - Where should I put my 'Save System Controller'

Making a save game system for a single player platformer game in Unreal. Needs to be accessible from the Main Menu Cannot be a component on the player. Where is the best place to put/store this ...
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26 views

Creating an asset library accessible from all classes

The idea of what I'm trying to do is to create a class that will automatically pull in all of the assets needed using the ConstructorHelpers and store them in a library with IDs. Then from there, any ...
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1answer
69 views

Unreal Engine Linux Support

I use multiple game Engines, but havn't used Unreal engine for quite a while, Now with the recent changes in Unreal Engine there are quite some interesting features which would be interesting to use ...
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1answer
1k views
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1answer
85 views

How to get image component from blueprint in c++

I have a dialog screenwith character icon and I need to be able to set up this image in code. But I don't know how to access this Image component (I put material instances in it). .h ...
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2answers
1k views

How to apply a texture to an object by face rather than the entire object? (unreal 4)

I am trying to apply different textures to a model I have by face rather than the entire object. I am only able to add one material to the entire object. How can I apply different textures to ...
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1answer
195 views

Exporting models from Crocotile3D to Unreal Engine 4 (.obj). Texures are always blurry. I want crisp, clean textures

Can anyone help me? I am exporting models with textures (.obj) from Crocotile3D to Unreal Engine 4. I want them to be crisp and clear, as in the left image (Crocotile editor), but only get blurry, as ...
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0answers
228 views

GetUserWidgetObject returns null

I have a widget component inside of my character: ...
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0answers
100 views

How to prevent rendered wound from sliding on moving character?

I am trying to display a rendered wound on the character, but I still can't figure out how to display it properly without sliding on character's body. I'm following this link on rendering the wounds ...
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1answer
60 views

What does 'AlwaysResetOnEntry' do, and where would it be used?

In Unreal Animation Blueprints, each state has an option for AlwaysResetOnEntry. The tooltip text for this is: ...
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1answer
99 views

Avoiding Incredibuild error when building

Apparently the UE4 Installed Build script function is trying to use Incredibuild, but halting with an error. I believe this is due to my Agent Services not running, due to the fact that I have none. ...
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0answers
263 views

How can I import a model from a Source Engine game into Unreal Engine 4?

I am currently developing a game in Unreal Engine 4. This project is for personal use, and will not be exhibited or sold. Because I have no talent, I need to snatch some models from some Source ...
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1answer
66 views

What is the correct way to make an Installed Build?

I am trying to use the Automation tool, following the documentation. To create an Installed Build: Run the Installed Build Script by invoking the AutomationTool with the following command line, ...
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1answer
1k views

What folders can be safely deleted after building UE4 from source?

What folders, if any, can be safely deleted, after building UE4 from source? After the build, UE4 files occupy 65 GB of disk space, which is way above comfortable for me, since I only had 72 GB free. ...
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1answer
36 views

Get FVector from Blueprint tick function

In my BluePrint Tick function for my character, I have a FVector that always changes, and in my C++ component, I want to get this changing FVector and use it in my C++ Tick function, is that possible ...
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1answer
84 views

How do I create cinematic (trailer like) shots of my game?

Background We are in the midst of developing a trailer for our game. It is a 3rd person adventure platformer. As such, the camera is an over the shoulder position, which is great for gameplay, but ...
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1answer
87 views

Get BP FollowCamera Rotation and Location

I'm accessing my FollowCamera https://imgur.com/a/vbFagxg from my BluePrintCharacter class in my C++ code, with this following line : ...
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1answer
193 views

Update Project Version, or other Project Settings, from command line

Is it possible to update UE4 Project Settings from command line? More specifically I would love to be able to update the following Project Settings attributes from command line using, for instance, <...
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1answer
1k views

Unity raycast equivalent in Unreal

I've been moving from Unity to Unreal and I'm finding it difficult to grasp the Raycast (Trace) logic of Unreal. The use case I'm trying to implement at the moment is to trace a ray and check if I ...
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1answer
863 views

UE4. How to create a reference to the physical material asset (which I create in editor) in C++

Oftenly, when we want to assign asset to the particular component in C++ we write code like that: ...
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2answers
157 views

Third person and LineTracing C++

Problem I have a crosshair in the middle of the screen. I need to create a lineTrace that passes straight through this crosshair. As this is a third person game,...
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1answer
101 views

Why Epic don't release a pre-compiled binary tarball for Linux?

On linux, the 'recommanded' way of installing ue4 on linux is building the engine from github source. It is very time comsuming. For each new version, I need serveral hours to rebuild it. Why don't ...
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1answer
36 views

Viewport Navigation controls

I'm encountering an issue: I cannot move into my view with W, A, D, ...
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2answers
1k views

How to convert Unreal Engine 4 spline to a bezier curve?

I have read the source code of USplineComponent and found that for a curve in Unreal, the result is calculated via ...
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1answer
23 views

Empty Array of IMotionControllers for Unreal using Oculus Quest

The typical way of setting up a MotionController in Unreal Engine is through Blueprints, but I'm trying to identify different types of motion controllers for various VR setups and from there apply the ...
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1answer
403 views

Moving object with turn in UE4

I have been struggling with this problem for a while. In my project (RTS in space) I have a ship moving on a 2D plane. I want to make the right movement in space so that when I click somewhere in ...
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0answers
168 views

Generate road mesh from a graph

I want to generate a mesh for the entire road network(later I'll probably want to split it into chunks but for now this will do). My road network is stored as a ...
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0answers
135 views

Prevent showing movie files after packaging unreal game

I developed a game which has some videos inside it. I added videos into my project folder so that I can access them. After packaging, on the folder all videos will be shown as its original format ...
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1answer
2k views

What are spline input keys?

There isn't a really adequate explanation of these anywhere on the internet, so I thought I'd ask this question here. What are spline input keys in Unreal? How are they represented in Unreal? Also: ...
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1answer
347 views

How to apply linear drag to a velocity vector?

I have built my own movement code for my character as I want to make smooth movement. (This project is just a character and a floor/wall for testing). The code seems to work fine, but I of course ...
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0answers
793 views

How do I prevent camera jitter when rotating the player - Unreal?

This is a problem that seems to have no reasonable answer anywhere around, yet is a commonly needed aspect of developing game mechanics. Context I'm developing a traditional 3rd person character ...
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1answer
227 views

Performance cost of creating local variables just for 'readability'?

I am learning C++ and Unreal Engine. I'm wondering if creating local variables inside functions purely to help me read the function later will cost my game/code in performance (assuming if I carry on ...
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1answer
2k views

Set the LineTraceByChannel to use my custom created channel? C++

I want to use LineTraceSingleByChannel function for my SightRay component which will be used for my adventure game. I want to mark certain objects in game as 'Viewable' in Trace Channel. Then the ray ...

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