Questions tagged [unreal-engine4]

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How do I uninstall `libllvm3.8 (1:3.8-2ubuntu4)` and install `libllvm3.8 (= 1:3.8-2ubuntu1)`?

I'm trying to install UnrealEngine4 by following the instructions here: https://github.com/Microsoft/AirSim/blob/master/docs/build_linux.md. When I run ./Setup.sh in the UnrealEngine4 repository, I get the following error: The following packages have unmet dependencies: clang-3.8 : Depends: libclang...
Carson Tang
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Why am I getting a null UStaticMeshComponent when using Unreal Haxe

I'm trying to use the following Haxe Unreal plugin. https://github.com/proletariatgames/unreal.hx My class seems to compile without error but when I try to create a UStaticMeshComponent using the FObjectInitializer I keep seeing a null value when I trace this in the console. Here is the Haxe Exter...
mattwallace
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(C++) Console window keeps immediately closing even though I'm CTRL + F5 in Visual Studio

I'm trying to follow a C++ class to get more acquainted with the language and Unreal Engine. However, now whenever I start the program, the console window immediately closes. I've already tried fixing the subsystem stuff and I've seen some dirty code that wouldn't close the window, but I'd like to k...
Giovanni Vazquez
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built-in dedicated server unreal engine 4

I am questioning myself about how does the built-in function 'run dedicated server' works in Unreal Engine 4. I am currently using 4.18 version. I've search a lot to make it work, but every tutorial I saw (10+) doesn't directly use this option from the editor but instead download UnrealEngineSource...
NickD
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Unreal Engine access violation crashes using third party library code

Some background information first. I'm currently trying to write a c++ class that can parse a file and generate a tree structure from it that I will be able to use for Inverse Kinematics. To do this I'm making use of some ROS libraries that are able to incorporate the functionality that I need, nam...
Brad Matthews
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HLSL: How to return one number from compute shader?

I try to implement MarchingCubes algorithm on compute shader so I need to know actual number of generated triangles. I use Unreal Engine 4 and HLSL (Shader Model 5) How can I get back one single uint from shader? I tried to generate RWStructuredBuffer with one variable and increment it with Interloc...
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how to access ID3D11DepthStencilView from unreal engine device using c++

I am doing some research work on unreal engine and getting some problem. I am successful in getting unreal engine device using c++ code. My aim is to get ID3D11DepthStencilView from unreal engine device. I am using OMGetRenderTargets() method to get it but method always returning null. My code :-...
Rohit Singh Bisht
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Bushes turn black on certain sides

I recently started using Unreal Engine 4 and tried to make a simple room. However, when I added a subtractive brush or changed the view, I'm not exactly sure, certain sides of my brushes turned black. Now I can't see those sides anymore, no matter in which view mode I am, except for the wireframe mo...
user9799032
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Unreal engine 4 c++ undestanding [on hold]

I know some unity and i want to switch to ue 4 and i have some questions. My questions are about c++ programing.. 1) How can you manage c++ memory... An exemple: You have a scriptA and ScriptB. If you are doing something scriptA activate scriptB, after it is done , scriptB it's disabled. In unity yo...
MaddDogg
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LNK2005 error when integrating LuaJit in UE4 (Unreal Engine 4)

lua51.lib(lua51.dll) : error LNK2005: _vsnprintf already defined in libcurl_a.lib(cryptlib.obj) GameName.Build.cs -> // Fill out your copyright notice in the Description page of Project Settings. using System.IO; using UnrealBuildTool; public class GameName : ModuleRules { private string ThirdPartyP...
Skits
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MP4 video streaming using Python

I'm trying to stream a video feed from a webcam in python to render as a texture in Unreal Engine 4. However, MJPEG is not supported by UE4 so I need my video to be H.264 and encapsulated in MP4 format. My idea is to use Flask and fetch the video feed with my Unreal app but again I don't know how t...
1

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Is there a way to convert an already made Blueprint to be the child class of another BP in Unreal?

Basically, I have two blueprints already made. I made the parent first and then one that is supposed to be a child class of the first. However, being a beginner in Unreal I forgot to do it when creating the second BP. Is there a way to convert it to a child BP class after it has already been created...
Dtb49
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the android sdk license dialog in project settings doesn't accept when I click it

Followed this exactly to step 2: https://docs.unrealengine.com/en-us/Platforms/Android/GettingStarted When I get to the Accept SDK button, it doesn't accept or grey out. There are a few more people with this issue this month, and I have seen no solutions. https://docs.unrealengine.com/en-US/Platfor...
PaulEckhardt
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How to enable C++17 mode with UnrealEngine 4.19 on VS 2017?

UnrealEngine 4.19 uses Visual Studio 2017's C++14 mode as default. The Visual Studio 2017 compiler has a flag /std:c++17 to enable C++17 and subsequently things like for std::optional. I tried adding the following line to VCToolChain.cs (C:\Program Files\Epic Games\UE_4.19\Engine\Source\Programs\Un...
Ela782
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Where to put the unreal engine python library for pylint

I'm playing around with the Unreal Engine 4 and the python plugin. Adding it and getting it to work is no problem (win64, python 3.6.5 64bit) but since almost every py file for unreal starts out with import unreal_engine and I don't have that installed to the system like I would with something from...
Killerpixler
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Access Violation on FObjectFinder

I got a problem with my project in unreal. I wrote some code about a month ago and it worked fine until yesterday when the editor started crashin on launch. I get this error message in the log: [2018.06.25-20.39.29:731][ 0]LogWindows: Error: === Critical error: === [2018.06.25-20.39.29:731][ 0]Log...
Birkl
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FFTW _GNUC_ is not defined as a preprocessor macro

I have linked a FFTW library to the Unreal Engine project from this website. But now when I try to include the header file to my project, I get error: '__GNUC__' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif' I have no idea how to fix this. I don't want to mess with the c...
LePython
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Update actor properties in game context

I am currently working on a plugin for the unreal engine 4. Currently I am facing a problem when I want to modify my custom actor's properties in game context. When I am in the editor context, I can simply call the PostEditChange method. This method however does not exist in game context. How would...
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unreal engine source code on github 404 error page not found

I'd like to get the unreal engine source code from GitHub. I successfully created an epic games account and connected it with my GitHub account. After that, I clicked the link of unreal engine on GitHub. But I encountered page error 404, page not found. I googled and some said that after you conne...
dudu
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How do we share compilation settings between project members in VS2017?

I want to set up some settings for building Unreal Engine 4 in Visual Studio 2017, and then share them so all programmers on the project have the same build environment. For example treating warnings as errors, using more strict compilation settings. However it's very difficult to find where these s...
Alex
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SViewTree's Children dosen't work after first level

I created a Slate TreeView widget. It works fine until I extend the first level of the tree. Then it dosent allow me to select any of the children (That are in the second level of the tree), And it dosent even show me the subfolders of the next level of the tree. Im aware that I need to tinker with...
Ido Mtn
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How to use OnFinishedPlaying with c++ programing in ue4?

I want to fire callback when the character animation end.But it doesn't work for me.Do i use it worng?Or we have another solution.Please help.Thanks. // SoldierCharacter.h UFUNCTION(Category = 'Callback') void FinishedPlaying(); // SoldierCharacter.cpp void ASoldierCharacter::BeginPlay() { Super::Be...
李晓爽
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Unreal engine reinstancing non-actor handled ensure

I've been receiving a strange error after hot-reloading my code: Logs (I'll provide them in text form if needed) The error references a Notice Range Sphere component. It's just a UDetectionSphere, a simple wrapper for USphereComponent. It used to work correctly, I think the problems begun when I re-...
vrtex
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SVN automaticaly locks a .umap file in UE4

I'm using SVN as source control for my indie game project, but we are having an issue. The linux server where the repository are just accept one system user. So i've made several SVN users with SSH Keys and PuTTY. It worked fine, and the commits are made by several different users. But when i open...
MarceloBoy
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When I should define operations-type-traits for a USTRUCT

For some USTRUCT structs within UnrealEngine, type traits TStructOpsTypeTraits are defined. These provide a list of bools (encapsulated in an enumeration) about the implemented capabilities of struct T. What is the usage of those traits? When I should define those traits for my custom USTRUCTs withi...
Roi Danton
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How to preview Unreal Engine 4 Project on Oculus Go

I started UE4 and Oculus Go development 2 days ago. I saw youtube videos where the people were able to instantly connect the device to UE4. I followed full documentation. Turned on developer mode, Installed Android SDK, enabled the plugin and every small step in the docs. Now when I connect Oculus...
jagtar singh
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Can't close a hatch after i open it

Im new to Unreal Engine 4 and im trying to make a toilet lid and a fuse box hatch to open and close by pressing E. Open works fine on both but closing wont work at all. In the float track for the fuse box hatch, i added a start (0 time, 0 value) and end (0.3 time, -120 value). For the toilet lid i u...
Erdyxn
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How to retrieve the GameplayEvent payload from a GameplayAbility trigger?

When using Unreals GameplayAbilitySystem, a GameplayAbility can be triggered using a GameplayEvent. When using UAbilityTask_WaitGameplayEvent, the GameplayEvent provides a payload of class FGameplayEventData. Is it possible to retrieve such an event payload also from within a GameplayAbility, after...
Roi Danton
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Unreal Engine 4: What is correct way to PAK files, load/mount them and load assets with AssetRegistry in packaged game?

I want to do this: Create and package original game. Then I want to create additional PAK files with new meshes/sounds/animations and blueprints based on blueprint in the original game. Original game should not know anything about additional meshes/animations/etc. So I need to create a smart system...
Keri Enviro
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Mono behaving slightly differently on two different machines

I have several linux machines (Ubuntu 14.04) that build unreal 4 projects for me for the purposes of testing. As part of this process mono gets invoked. And fairly commonly mono (3.2.8) crashes with a Sigsev, which is fine. Unreal has built in retries for that occurrence. However on some of my Lin...
Dan Hollinger
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“fatal error: 'initializer_list' file not found” when compiling Unreal Engine AR Bluetooth template for Android

I'm attempting to build the Blueprint AR template for my android device. I have followed the instructions specified for the ARCore Prequisites and Android Quickstart. I've got my device connected and appearing in the launch panel, however when I hit launch, the build fails with the following error:...
CustardPaint
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Is Multiplayer-VR in the Unreal Engine Editor possible?

the situation: Person P1 starts the game via VR Preview Mode as CLIENT. Person P2 does the same but as LISTENING SERVER. Both use the same project. The project is NOT PACKAGED and they play from the unreal engine editor. The goal: P1 connects to P2 and they see each other moving around in the same m...
Ojad Yref
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UnrealBuildTool: ld.lld: error: unable to find library

OS Manjaro Linux 4.19.28-1-MANJARO Question Hi, Stackoverflow! I have some problem about ld in UnrealBuildTool. and I'm everything new about all Unreal Stuff. Week ago, I was found some Unreal-based Opensource project. released binary version is working perfectly. But it cannot build on my PC. I thi...
riemannulus
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UE UMG, when I addchild use C++, slot lost Slot properties I designed in blueprint, how can I keep it?

When I designed one Slot properties in blueprint, it works just when I put it on another blueprint directly.when I dynamic create one and addchild to another widget use C++, Slot properties designed in blueprint are not works, I need to set it by code, like this: this->Slot:SetMinimum(FVector2D.Zero...
CrazyStone
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Client unable to call an 'Execute on Server' event

I'm trying to replicate this door for other players using unreal blueprints. Currently I have a door parent holding a multicast and execute on server event that opens the door. I also have an interface being integrated on both the player pawn and door blueprints. Of course the server has network aut...
Mystic4TW
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Is there a way to emulate an android application within a windows program?

I realize it is an odd request, but I'm trying to enable an android app running within a windows program. It doesn't technically need to run within the program, but I would like to display the android app interface within my program along with being able to interact with the app. Anyone ever tried a...
Dan
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Link Error in Unreal Engine

Disclaimer: there is a high chance this is very specific to Unreal Engine, but I haven't got an answer there so I thought I'd try a more general query here. Sorry if this is considered off topic/too specific I am getting a link error compiling the following code in Unreal Engine 4: RHISetRenderTarge...
T. Kiley
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Unreal Engine 4: Accessing Custom Parent Blueprint's Components

I have a problem in reparenting blueprints. I've created a blueprint called 'BP_Collectible'. It has 3 components; Audio, StaticMesh and a box collider. If an actor touches this blueprint (box collider), audio is playing immediately and destroying the object. Everything fine. Now I am trying to crea...
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Unreal Engine 4 Blueprint Object initialization

I've just started using Unreal Engine 4, but whenever i choose Object as parent class for my new blueprint, i don't have any constructor (like Construction Script function for Actor) How can i make a constructor? I don't want to use Actor becaue the class is storing the equipment data for my charact...
Dávid Szabó
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2

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485

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How do I match xyzIj sets to pose data?

I am trying to work with the Google Project Tango tablet, I currently am sending data from my tablet to Epic's Unreal Engine 4 and trying to visualize it properly. The orientation of the cloud data however is having consistent issues lining up with the orientation of the Tango's pose data. Currently...
Jason Ryan

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