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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How to move default character into the imported object in UE4?

I've imported a building from Blender and when I press play in UE4 I can't move the default character into the building. Any way to fix this?
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How to deploy html package on centos with nginx (Unreal Engine 4.23)

I'm trying to ship a dummy game on a website. I've done every step in this doc and packaged the game. The packaged game is running on localhost on Microsoft Edge without any trouble. Then I've copied ...
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Overlap Collision on Box Collision only working on wireframe

When my player collides with the box collision instead of triggering while the player is overlapping the whole box it only triggers when I collide with the wireframe of it.
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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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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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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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Automation Tool Platform Error

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 ...
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1answer
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Deleting folders after a UE4 build

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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OnActorHit not calling hit function in Unreal Engine

I am trying to make a pong game in a 3D landscape. I want to make the ball bounce around the box or the Pong pad. But the ball just goes through the walls and pad, but the pad collides with the walls. ...
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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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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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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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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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Does PerObjectConfig work when loading?

Is PerObjectConfig supposed to work when loading (not saving) the configuration? I did a lot of tries but never succedded to make it work. It worked for a per class basis when droping PerObjectConfig ...
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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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Unreal Engine - Occlusion culling doesn't seem to work properly

I am playing around with some environments bought off the marketplace, one of which has a pretty intensive map with many houses, and a lot of detailed interiors for houses. I was under the impression ...
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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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21 views

Capsule component lagging when using AIMoveTo

I`m currently working on RTS in space. All ships are with fixed Z value. When ship is created its placed on a plane (Floor) with collision set on blocking. Every ship is moved by selecting it and ...
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2answers
60 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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Collision Overlap not working in a Plane

I want to make all the objects that are overlaping my plane to be sliced! I can achieve this effect sometimes, but in some cases it does not work. Below you can see a situation where the collision ...
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1answer
71 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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Viewport Navigation controls

I'm encountering an issue: I cannot move into my view with W, A, D, ...
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14 views

Setting and using a dynamic variable inside an Unreal material

I have an Unreal material that contains a custom node (with HLSL code) - where a condition involves comparison with a matrix of values that was computed in the previous time step. How can I create ...
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How to play runtime-generated LPCM audio from a third-party API in Unreal?

I've got an UE project, and I need to play audio coming from a third-party API. The Audio is in LPCM format, each frame is two bytes signed integer with little-endian byte order. How I can play audio ...
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1answer
72 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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How can I make a particle emitter (actor?) fade in or out based on player proximity?

Essentially its all in the title - I have a cylindrical effect made of a particle emitter, but it could be any object with a shader, and I want it to fade in and out the closer I get to it (it appears ...
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1answer
15 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
40 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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22 views

UE4 dynamic sprite creation

This concerns UE4.24: I've been trying to create a new Paper2D sprite from scratch during runtime. I've come as far as importing the .png and turning them into a texture, which works beautifully. ...
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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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45 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
91 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
72 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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57 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
107 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
89 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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1answer
48 views

Why is the timer not calling the function?

I am trying to call a function every 30 seconds. I have used this before without issues so I'm not sure why it isn't working now. Any ideas? Has something changed in 4.24 maybe? .h I have tried both ...
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Changing default folder structure of New Project in Unreal Engine?

I wonder is there a config option to change the default folder structure of a new project. So for example when I create a new project there is already a folder for 'Blueprints', 'Maps', 'Audio' and '...
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1answer
74 views

Excluding geometry from a shadow casting light in deferred rendering

Is it possible to exclude geometry from a particular shadow casting light in a deferred rendering pipeline? If yes, can it be done correctly or are there limitations? This is mainly to reduce the ...
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1answer
47 views

Unreal4 - Clothing and physics asset, collisions not working

I"m making a character in blender where there's a character mesh and simple skirt. The skirt has a different material slot, which allows me to use the Unreal Clothing tool. I created the clothing ...
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32 views

Clickable Text Render Actor

So I couldn't find anything online for this, but I want to make my text render actor clickable for my main menu. For example, when "New Game" is clicked it starts a new game. If you have any answers, ...
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47 views

Dynamic character in UE4

I've been creating simple characters in Blender for a while, and now I want to add dynamic details to them. I managed to make a cloak with using UE4 cloth physics. However I have trouble with smaller ...
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Why here does my use of GetOwner() make UE4 crash editor?

I am new to Unreal Engine. I am following a tutorial where at the end he challenged me to build some extra features to the game. Basically. This code crashes UE4, but I found out if I remove "...
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28 views

Eliminate unwanted “hills” in navmesh over a flat floor

So in the image below you can see that my navmesh has these weird hills being formed in it. Any way to remove these? My AI gets stuck on them.
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1answer
201 views

UE4 Multiplayer how to replicate Player name in lobby

I've been working on a little 1V1 snipper project to try and get a better grip on the replication and the game framework of unreal engine. So after the core gameplay, I'm trying to make a lobby ...
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1answer
65 views

Execute Timer Events of another Blueprint from the C++ UE4

I am having problem and it's about a week now that I still can't figure out how to get it right. It seems that I can't run any functions from the blueprints that contain timers at all. I have a ...
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1answer
48 views

Making a box character in UE4, not a capsule

I want to make a character for a Breakout game that is a kind of cube. From the instructions from Unreal it appears I need to create a 'Character' blueprint. But when i do this, it comes with ...
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1answer
124 views

Unreal Engine without Blueprints

Hello fellow coders I have been using Unity and other game dev libraries fora fun hobby for many years (on-and-off, I am no expert!). But I really am not happy with Unity and their multiplayer network ...
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1answer
142 views

Unpack the pak file - Unreal Engine

So I have the encryption key. This is stressed so much to have it. Well, I have it. Where do I use it? Unrealpak does not seems to offer an option to supply the encryption key, if your pak is encypted ...
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93 views

How to control multiple characters simultaneously in Unreal Engine 4?

How do I make two or more characters response to a single user input, in this case a mouse click? Ideally, I'd like something similar to Baldur's Gate style party control. The only example of ...

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