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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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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36 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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37 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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57 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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39 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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70 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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34 views

Accessing the Properties of an object already in Scene in Unreal Engine using C++

I am trying to learn more about raycasting in C++ and am trying to implement raycasts in a mini third-person game I am creating. In order to shoot a raycast, I first need to determine its starting ...
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21 views

Unreal doesn't see Visual Studio 2019

I have Visual Studio 2019 installed, with all of the tools mentioned in the Unreal documentation installed, and when I try to create a C++ project in Unreal Engine, I get "No compiler was found. In ...
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12 views

unreal import vs import into level

I'm trying to import my blender generated fbx file in to the unreal editor with import into level tool and it keeps messing up the scaling. The ...
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1answer
25 views

Why do I get syntax error: identifier FHttpRequestPtr

I'm trying to add HTTP requests to my game and everything compiles fine until I try to set up a delegate for when the response is ready. Adding this function causes the compiler to fail for syntax ...
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45 views

Can I use plain old C++ objects and smart pointers in UE4?

I'm a big fan of reusable code and want to make use of code that I integrate into UE4 projects outside of the engine as well. I am new to UE4 dev, so this is my first attempt of weaving the UObject ...
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Why does not checking for something before using it *sometimes* crashes the editor with an unhandled expection?

This has happened a couple of time and I just want to understand what's going on. Most of the times I can use GetController() without any problems, but sometimes I need to check for it first, ...
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53 views

C++ property is none when accessed in bp

I have a class in C++ that I want to access in BP. It appears to be fine in C++ but in BP I get Accessed None errors when I try to use it in BP. Here is the class declaration that I am trying to use ...
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1answer
127 views

'Destroyed Actors' and 'Save Games'

Background Our team is creating an adventure platformer, and I have been tasked with creating a Save Game system. Our game features the usual progression systems, and is relatively linear. Approach ...
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22 views

How can I render multiple arbitrary views from starcraft for a custom client?

I am wanting to create a custom interface for starcraft 2 to do some HCI research, and I'm currently using the client SDK for client game information and interactions. While the SDK is great for ...
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17 views

Is anyone else having problems launching UE4 4.23.1 on OS X 10.12?

So I recently switched machines from Windows to OS X (I still have the Windows machine but it's not available to me sometimes so I wanted to keep going while it's processing some other stuff). UE4 ...
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31 views

Displacement map to create terrain

I am trying to figure out the best way to create a procedurally generated terrain at runtime in Unreal Engine 4. For the moment, my idea is to generate a heightmap and apply it to a plane as a ...
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39 views

UE4 - Want my landscape to be unlit BUT catch shadows from objects

Here is my problem, I have a landscape that was created through photogrametry. I already has strong shadows on it's diffuse texture so I don't want it to be affected by my virtual sun. What I do want ...
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17 views

Unreal Engine Niagara Write to Texture or Data Structure

In the Niagara system, is there any way to write to a texture? I want to write the position of each particle into a texture. So the 2d grayscale texture has its intensity as the number of particles in ...
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26 views

What causes the car in the Vehicle Advanced template to rotate in the air?

If you start a project with the Vehicle Advanced template, move the car high up, and press play, the car will rotate forwards as it falls. As far as I can tell, most things within Unreal Engine will ...
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67 views

UE4 Code Project is not showing sub folders created within C++ Classes Folder even though they exist

These were my steps. Created an empty code project in UDK4. The editor starts up. On the left bottom you have: If you try to right click on C++ Classes, Or select [Add New] while having C++ Classes ...
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1answer
29 views

How to change the up vector of something in Unreal

I'm creating a grapple hook mechanic. The elements of this particular situation are a Player and a grapple point. I would like the top of the player to always be pointing towards this grapple point. ...
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1answer
34 views

Destroy multiple actors by pressing a button

I'm making a simple project to learn Unreal Engine. I have 50 actors (blueprints) and at the start a function will loop 5 times and spawn 5 of the 50 actors randomly. How can I destroy the actors by ...
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1answer
326 views

What Situations is Saving a Game to Main Memory for?

I've been reading through Unreal's 'Saving and Loading' guide: Link Within, they present a capability to save a game to main memory rather than secondary storage: I haven't found any information on ...
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39 views

Unreal Engine Niagara Particle Velocity Based on Density of Particles?

Goal: Simulation of particles where each particle moves to the direction with the highest density out of candidate directions. I'm not sure how to do the following operations using UE Niagara. How ...
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1answer
134 views

Unreal C++ Detecting new Key Down during current Key Hold

I am currently working on a combat system and I wanted to be able to have key combos to execute combat moves and such, and I am detecting key input type as well for example, if the key is tapped, or ...
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1answer
98 views

Don't block Camera with Blocking Volume in Unreal Engine

I use Blocking Volumes to prevent players from falling off platforms in a third-person perspective game in UE4. These Blocking Volumes however block the camera, as if they were a physical wall. How ...
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1answer
73 views

How to use TEnumAsByte Unreal 4.22

The problem I am attempting to use a TEnumAsByte in one of my class headers: I get compilation errors: Code sample I have included everything relevant to the ...
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57 views

UE4 - UProceduralMeshComponent - texturing issues

I am having a lot of trouble texturing a procedural mesh in UE4. I am using perlin noise from Accidental Noise Library with PolyVox to generate randomized marching cube terrain. Accidental Noise ...
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1answer
35 views

UE4.23 - Cast of child of GameUserSettings fails

I've derived GameUserSettings to add a bunch of custom properties to it. I tried making accessible in blueprint by creating a static method that returns the current GameUserSettings cast to my Child ...
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33 views

Grappling hook force resolution

Our team is creating a 3rd person adventure platformer in Unreal 4.22. One of the mechanics is a grappling hook. Think less-so a 'pull-to-point' grappling hook (Widowmaker, Just cause etc.). However ...
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103 views

Is there a way to assign a texture to a button and resize it in the Unreal Engine?

I'm attempting to create a main menu for my game and have followed an easy tutorial to do so. The tutorial doesn't cover assigning textures or images to buttons, so I set out to do this myself. ...
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23 views

Blender to UE4: Custom rig has bones ending up in the wrong place

I'm trying to create a custom mesh and rig in stock Blender 2.8 and export it via .fbx to stock UE 4.23. Unfortunately, the bones of the skeleton end up in entirely the wrong place. In short, the ...
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22 views

Implement a scale factor to apply to UCharacterMovementComponent::JumpZVelocity in Unreal Engine 4

I'm creating a my own movement component inherited by UCharacterMovementComponent. I should implement a scale factor (I called it JumpZVelocityScale) to apply the JumpZVelocity (and I don't want ...
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1answer
22 views

How do the PhysWalking and similar functions actually handle input?

As the title may suggest, I'm developing a CustomMovementComponent and I'm on the stage where I am developing my own PhysCustom ...
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1answer
81 views

In a MovementComponent, where should I initialize member variables?

I have a MovementComponent derived from CharacterMovementComponent MovementComponent, ...
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28 views

How to use a derivative of CharacterMovementComponent

I'm developing a 3rd person platformer. My Character class (the default third person template class): PlatformerCharacter : ACharacter My MovementComp class: <...
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1answer
132 views

What is the Workflow? Blender -> Substance Painter -> Unreal Engine 4

My name is Jose and I'm pretty new to Game Art Development. I know some intermediate UE4 (both C++ and Blueprints), but my weakest point has always been the workflow to import assets from Blender and ...
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46 views

How does CharacterMovementComponent::PerformMovement work?

I'm developing an adventure platformer. As such, the manipulation etc. of the CharacterMovementComponent is going to be crucial to the game. I have seen the more ...
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1answer
219 views

Unreal Engine: Object Reference is not compatible with pawn Object Reference

Hello I am a beginner Unreal Engine developer learning with Blueprint and I am trying to take an imported FBX model and put a pawn control on it. Below is what I am trying to do. By the way, ...
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1answer
50 views

Unreal MouseWheelAxis negative axis does not work

Would like to avoid using separate action mappings i.e. MouseWheelUp and MouseWheelDown for a system I'm developing. I noticed <...
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1answer
74 views

GenerateProjectFile error Referenced directory […] does not exist

I am following this tutorial to install Unreal Engine 4.22 from GitHub on Windows. I forked the project and cloned it on my computer. I've executed Setup.bat and ...
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51 views

UE4. Reload CDO default values?

My aim is make difficulty system that will edit Class Default Object values for any specified class. It's fastest way to make any properties that will dependent to difficulty by game designer (Class. ...
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1answer
51 views

Passing by pointer-reference in blueprints with C++ definitions

MyFunction( Class *& foo ) Inside a derivative BP of the above C++ class: foo shows up as an output rather than an input. Why?
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1answer
56 views

How do I access a struct that resides within a struct in blueprints?

I have a struct: "FOuterStruct" This is defined in code such that it contains another struct type: ...
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1answer
79 views

How do I create a spherical world to explore?

So to preface this question, I have done a lot of research on this, but most of it has proven unhelpful, possibly because I'm not sure the proper way to phrase what it is that I'm trying to ask, so I ...
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1answer
48 views

Why can't a blueprints project edit BPs derived from c++ classes?

I am working in a relatively small team. Now, because our IT guy is incredibly unhelpful, we don't yet have VS on all the machines (as I know this would solve the error). However, I'm still curious ...
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1answer
61 views

What is an ArchVisCharacter? What is it used for?

As the question states. I can't really find any useful documentation surrounding this. What is an ArchVisCharacter and what do you use them for?
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1answer
38 views

Blueprint formula doesn't match material formula

I'm currently working on a physical water system for Unreal. To represent the water surface, I have a simple flat grid mesh that I then apply a material to which has a formula for world position ...
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2answers
173 views

How to make a homing projectile make a more objective path to the target?

I'm having trouble trying to get a projectile thrown by a tower to hit the player quickly. See the image below: The projectile hits the ground very close to where the player was. If the player did ...