717 questions
0
votes
1
answer
73
views
Unreal Engine 5.6 compile error "SetEnv" path too long
I was facing this issue a lot where you can't rebuild your game from unreal engine and it always comes with 1 error "SetEnv" path too long, most of you all might face this issue in the ...
- 127
Tooling
0
votes
0
replies
34
views
Does Unreal Engine support Android XR, and what is the correct setup to use it?
I am researching whether Unreal Engine can be reliably used for Android-based XR before starting a new project.
The documentation is unclear and split between ARCore, OpenXR for Android, and vendor ...
- 365
-1
votes
0
answers
54
views
How would I go about creating a sprint script in Unreal Engine? [closed]
I'm pretty new to Unreal Engine and I've been experimenting with blueprints and tutorials to try and get a sprint script working with a smooth gradual change.
I first used a recent tutorial which let ...
- 1
Best practices
0
votes
0
replies
32
views
screenshot unreal app in windows ci pipeline
Is there a best practice to capture screenshots of an unreal app when performing a test in a gitlab ci pipeline? gemini suggest using movie render queue w a vnc session or NICE DCV to stimulate a user ...
- 1,926
Best practices
2
votes
0
replies
42
views
Compute 1D motion profile with acceleration, deceleration and mid-course target change
I need an analytic solution for a 1D motion controller. Initial state: x=0, v=0. Parameters: a_acc = 50, a_dec = 30, v_max = 40. Given a target position (e.g. x=20) the object should:
accelerate up ...
0
votes
0
answers
28
views
How to know from where the fbx was imported once it's already an uasset?
Once the ue5 uasset static mesh is imported, is there a way to know it's original path to reimport it (but rewrite over it in the same directory to not create a mess each time) ?
- 103
0
votes
1
answer
49
views
Rotate Pelvis to face the camera UE5.6
I am in the process of making an active ragdoll character in ue5.6. I have gotten the ragdoll walking, grabbing, hanging, jumping, and all sorts of fun stuff. But I am currently stuck on how to make ...
- 1
1
vote
0
answers
86
views
QEF Implementation returns unexpected results on the Z value
I have a QEF implementation like this
float atA[3][3] = { 0 };
FVector atb = FVector::ZeroVector;
for (const FEdgeIntersection& e : IntersectionList)
{
const FVector& n = e.Normal;
...
- 1,257
0
votes
0
answers
67
views
Linker error when importing AWS libraries in Unreal Engine
I am trying to get users to be able to log in via a Cognito account and use those credentials to make calls on a backend API. To that end I have been trying to import the Cognito libraries in an ...
0
votes
0
answers
213
views
Unreal Engine 5.6.1 Packaging Compiler Error {LogOutputDevice: Error: Ensure condition failed: bCustomPropertyListForPostConstructionInitialized}
I'm having a problem that I can't solve because I'm just to rookie for it, and I spent the last day trying to find a solution that it didn't work, I tried to rename it, it didn't work, I tried ...
- 1
0
votes
0
answers
65
views
Gyro stabilization tilts sideways on slanted ramps (Unreal C++ custom movement component)
I’m building a custom movement system for my project (kind of a physics-driven movement framework).
Everything works great, except for one annoying issue with GYRO STABILIZATION.
Video showcase of the ...
- 1
1
vote
0
answers
142
views
Unreal Engine / C++ : i can't access methods of a "TScriptInterface" object
In my Unreal Project, I got an interface "FVariableBloc" that I use to stock something I call a variable, with basically just a name, a float value, and some setting information :
...
3
votes
0
answers
934
views
Unreal Engine 5.6.1 (also 5.8) will not work on macOS 26.0 + Xcode 26.0
When I try to run UE 5.6.1, or UE 5.8 (Built from Source Code), I get the following metal error:
I have tried modifying the Apple_SDK.json and setting the Max versions to 26.0.0 and LLVM versions are ...
- 12.3k
0
votes
1
answer
47
views
Unable to debug direct Input modules, dinput.lib/dll
I'm working on a Direct Input Blueprint function library for ue5 (For a number of reasons not relevant, I need to avoid the enhanced input modality of ue5). I've encountered an issue with the ...
- 17
0
votes
0
answers
45
views
Widget update on Listen Server UE C++
I'm actually trying to make a lobby system in C++ with Unreal, but actually I'm facing a huge problem.
My widget is updated with replication when a player hits the ready button that toggles if the ...
- 1
0
votes
0
answers
297
views
Compile errors/Can't Build project in an "empty" Unreal 5.6 C++ Project in VS 2022
I think I have misconfigured VS 2022 (out of ignorance) but I can't build my project due to dozens of errors that I have been unable to resolve. I ran into this issue with the project I was working on,...
0
votes
1
answer
147
views
UE 5.6 – Control Rig + Sequencer: character stays in T-pose / animation won’t play (project-specific; works in fresh project)
In my project, adding an Animation track to a character in Sequencer makes the mesh stick in a T-pose and the animation won’t play. Same workflow works fine in a brand-new 5.6 project with the default ...
- 33
0
votes
0
answers
82
views
How to get information from a QR Code with Unreal Engine Android
I have very little experience with c++ or java and I want to make an Android app with Unreal Engine 5.3, which can either scan or be opened by scanning a QR Code and do something with the Information ...
- 41
0
votes
0
answers
75
views
Why Unreal does not support UMG animation tick for FDefaultGameMoviePlayer
As we all knows, when we LoadMap in Unreal engine, the main thread will be blocked, and the UI will be stuck. So Unreal provide us FDefaultGameMoviePlayer, which uses another thread (...
- 23
6
votes
2
answers
580
views
How to build an Android app using Unreal Engine 5.6 so I can use std::stringstream without crashing?
Problem:
When I use std::stringstream in Unreal Engine on Android, I get a crash when running the app on the phone.
Note:
Running the app on my Desktop does not crash.
How to reproduce:
Install ...
- 392
0
votes
0
answers
66
views
“Move Component To” blueprint not working - Unreal Engine
I'm using Unreal Engine 5 Blueprints and I am trying to create a door where if the object detects collision, it will move by -5 units along the X axis. Instead, it is moving -1.5 units along the Z ...
1
vote
0
answers
109
views
UE5 Persisting viewport scalability settings how?
I’m trying to figure out how to persist the scalability settings (set via the little viewport “Settings” dropdown in the editor) between Unreal Engine sessions.
Right now, whenever I set the ...
- 1,237
0
votes
0
answers
50
views
Visual artifact(line) when using VectorToRadialValue node in Material Editor UE5
I’m creating a pulsing water/portal effect using the VectorToRadialValue node in a material, but I’m getting a visible line or seam that appears across the radial distortion. The line seems to come ...
0
votes
1
answer
334
views
RiderLink install fails with ExitCode=6 [closed]
I just uninstalled Rider 2024.1.6 and installed the 2025.1.2 version. The old one worked perfectly fine, but this one doesn't install RiderLink. I installed Rider in D:, just like the Unreal Engine, ...
- 11
0
votes
0
answers
141
views
Mouse Follow Lag in Unreal Engine Editor (Not In-Game) – Still Present in 5.4 and 5.6
I’m experiencing a strange issue with the Unreal Engine Editor — the game itself runs smoothly, but the editor UI (such as menus, content browser, and explorer) is lagging behind the mouse movements. ...
- 1,237
0
votes
1
answer
149
views
Editor Utility Widget OnInitialized method is never called
I've created an Editor Utility Widget blueprint in Unreal. This widget contains another widget blueprint that inherits Common Tab List Widget Base. This class needs OnInitialized to be called to set ...
- 473
0
votes
0
answers
71
views
One questions about Archetype and chunk of Unreal 5 Mass System
In the source code of the MassEntity module of Unreal 5, Is the raw memory of all chunks under the same Archetype contiguous?
// This is one chunk within an archetype
struct FMassArchetypeChunk
{
...
0
votes
0
answers
52
views
Error with model when converting from Mixamo to Unreal Engine 5
I've just started learning UE5, and I immediately ran into this problem. When converting animation from Mixamo, using the program Mixamo_Converter. The resulting animation, warps the standard skeleton....
- 1
1
vote
0
answers
115
views
How to extend HLSL custom nodes in material editor
I want to sample directional light shadowmap in material editor as a node, in a forward rendered UE5.5 game. I want this to work on both mobile and PC. Basically I need a "...
- 110
1
vote
1
answer
191
views
CitySample Project Throwing Errors When Packaging
I am making a new game based on the CitySample project by Epic Games in Unreal Engine 5.4.4, but when I try to package the game for Windows, the game throws an Unknown error with ExitCode=6 for ...
0
votes
1
answer
39
views
UEFN vscode ballon life system issue
I'm trying to build a "balloon life system" (players lose balloons when damaged, then get eliminated), but I'm hitting some small errors with the events and Print formatting.
Code Below:
...
- 13
1
vote
1
answer
1k
views
Error building c++ scripts with unreal engine
I am trying to get started with learning c++ with unreal engine but everytime I try to build it comes up with 1 error and I have looked around everywhere for a way to fix it but nothing I try works. ...
- 11
1
vote
0
answers
68
views
Vulkan Android VR Preview is Darker than PC D3D11 Preview in Unreal Engine 5.3.2
I'm working on a VR project using Unreal Engine 5.3.2 with the Meta XR plugin targeting the Meta Quest 3. When I preview the scene in the editor using PC D3D11, everything looks great. But once I run ...
- 19
3
votes
0
answers
156
views
UBT: Plugin modules are excluded from the C++ project (Unreal Engine 5.4.4)
I have encountered an unexpected for me problem of connecting plugins to C++ project in Unreal Engine 5.4.4. I am not experienced in Unreal Engine, so the problem may be trivial but I hope for your ...
- 31
1
vote
0
answers
59
views
AWS SDK S3 GetObjectAsync crashes with ResponseStream in Unreal Engine - how to fix?
I'm using AWS SDK for C++ (v1.9+) in Unreal Engine to download files from S3, but I keep getting crashes in aws_cpp_sdk_core!Aws::Utils::Stream::ResponseStream::ReleaseStream()
Here's my exact code:
...
- 11
1
vote
0
answers
156
views
Anyone knows how to open this zipped Unreal Engine 5 project?
So, I've a zip file that contains all the project files including Content and Config files.
However, after I unzip it the file doesn't include .uproject file.
I tried to unpak the .pak file and run ...
- 11
3
votes
1
answer
259
views
Unreal Engine 5 /CPP - my UINTERFACE function can't return a struct
I've been working on my Unreal Engine 5 CPP/Blueprint project, and I've a problem.
I've this UINTERFACE "FBloc" in my "ProgrammingSystem.h" file:
#include "AdditionalInfo.h&...
0
votes
1
answer
78
views
Rider Code Cleanup Auto Indenting on Comments
Does anyone know how to stop Rider's code cleanup tool from affecting the indentation of comments?
For reference whenever I use the code cleanup feature it changes this:
switch (PlayerController->...
- 21
1
vote
1
answer
350
views
Translucent material not affected by post process in Unreal Engine 5
I'm trying to figure out why my translucent material doesn't get affected by post process material in Unreal Engine. Is there a way to override this?
I've tried checking the Custom Render Depth Pass ...
0
votes
1
answer
91
views
Trying to create an arch for throwing objects using predict projectile path
I am trying to make an arch to display an object trajectory when throwing it. For that I am using Predict Projectile Path to do this, however I am having a couple of issues.
One is I am having trouble ...
- 73
1
vote
0
answers
46
views
How to dynamically populate menu objects UE5
This is less a code question and more of a data structure(?) question. I currently am working on a game in UE5.5. I have an airship, which has components, things like engines, weapons etc. Structure ...
- 33
1
vote
1
answer
112
views
How to get external and internal faces from a TopoDS_CompSolid in OpenCascade C++
From an OpenCascade TopoDS_CompSolid, I'm trying to
get a list of all external faces (the outer shell/envelope of the TopoDS_CompSolid)
get a list of all internal faces (in the case of the screenshot ...
- 411
2
votes
0
answers
41
views
Unreal Engine and Niagara component simulation in a Level
So I am trying to render a Niagara Component in a world only when a prompt a specific thing which in my case is a diagnosis - it registers in UE_Logs but doesn't show up, it only appears after the ...
1
vote
1
answer
79
views
Adding any UFUNCTION or UPROPERTY breaks Unreal build
Been working on a C++/BP unreal 5.3 project for about a year now and all of a sudden, any time we add a new UFUNCTION or UPROPERTY declaration, the entire build massively fails with hundreds of random ...
- 644
1
vote
1
answer
97
views
How to use BP to delete vertex color of a static mesh asset in UE5
I met a problem in build a blueprint tool.
I m trying to use blueprint to batch processing static mesh vertex colors with blueprint tools. I wrote a C++ blueprint function which use a static object as ...
- 11
1
vote
1
answer
125
views
Build errors in Unreal Engine
I'm trying to implement a window-moving function using the MoveWindowTo function in a game I'm making with Unreal Engine. However, I get the following error:
undefined symbols for architecture arm64:
...
1
vote
2
answers
210
views
Member functions called in lambdas
This question arose when programming for Unreal Engine with TFunction<> but it is fundamentally about C++ and I believe the example is equivalent.
The questions are:
How to ensure that the ...
- 259
1
vote
1
answer
276
views
Unreal Engine 5.5. GAS PostGameplayEffectExecute. Problem with Data
I am using Unreal Engine version 5.5.
And try to understand Gameplay Ability System.
But in this part of the tutorial I got a problem.
I can't understand how fix the problem.
I create the class, ...
- 31
2
votes
0
answers
88
views
What is the purpose of the full memory barrier between two seq_cst operations in FGCCSyncObject::GCLock of Unreal Engine
I'm reading the sourece code of GC in Unreal Engine. Here is the implemetaion for the global gc lock:
/**
* Garbage Collection synchronization objects
* Will not lock other threads if GC is not ...
- 23
0
votes
0
answers
32
views
Trying to setup a layered material from the automotive materials pack Unreal Engine 5
Hi I'm trying to setup a layered shader, using the existing material library that comes with the automotive materials pack. From the tutorials I've seen this can only be done by converting all ...
- 71