Questions tagged [unreal]

The Unreal Engine. Not to be confused with the free UDK.

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Porting Plugins from UE5.0 to UE5.1 source build causes DLL Registration Errors

I built UE5.1-Main from source successfully. I'm trying to port my UE5 marketplace plugins, but when I launch the editor I get these errors for all my ported plugins. I suspect it might have something ...
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Can you use common Datastructures in UE?

I just saw that you normally use Unreal engines own data structures when you code scripts. Why is this are those better ? Can you also use the common c++ datastructures ( vector... ) or are you forced ...
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Level Instance Blueprint Option Hidden UE5

So, here’s the deal. I’m trying to make level instance blueprints with Megascan assets (i.e. group them and convert to a single blueprint), but when I select them all and right-click, I can’t find the ...
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Strange lighting/shadows in Unreal Engine game (shadow suddenly gets darker or lighter)

As the title suggests. I have made a level for Unreal Engine. It uses RectLights in the ceiling without any directional lighting. There is a Lightmass Importance ...
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Can I get an Unreal CaptureComponent to output the pixel differences between the current capture and the previous?

My current set up in UE captures images through this conventional pipeline: Capture component -> Post process material (specified in component options) -> Render Target What I need is to be able ...
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Reliable RPC frequency limits in Unreal Engine

I am implementing a fighting game in Unreal Engine and I want to implement "rollback". The way I envision it so far is that in every frame, the client will send the inputs it received in ...
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How to change skeletal mesh with multiple .uc files in runtime

My plan for this is kind of complicated. I want to create a world where you can find things and place them around the map. But I don't want it to be too complicated. If my character had the ability to ...
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How to keep building map beyond world border / increase map size in Unreal 3?

I'm trying to build a huge map in Unreal 3, but I can't move or build in editor because I'm outside the world border, and I can't seem to extend the map size. I'm looking for a way to increase the map ...
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Unreal Engine "Character". Mesh Component cannot be moved on Z Axis at runtime?

I am using Unreal extending the Character class. I have a mesh of just arms for FPS view. It is child of the Camera Component which I created in the Character class. For some reason the Arms mesh does ...
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Is there a way to call an exe from a unreal game

I'm making a turn based game Unreal with someone. They are writing the AI in C++. When it's the AI's turn I call the exe they have written. How should I call the .exe or is there a better way? I tried ...
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Unreal Engine Character Replication. Where to find out what exactly is being replicated? Is the Material replicated?

I have been experimenting with Steamworks SDK and Unreal Engine. I have managed to successfully code the connectivity part (ie. I can connect to a Steam Lobby with several players and it will then ...
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Problem rendering Custom Fonts on UE4 Text Render Component

I have imported a TTF font on unreal engine. At first I just let unreal engine create the Font asset automatically, but when I try to create a material with that font it gives me a warning telling me ...
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Viewpoint at floor level when playing build, but correctly tracked when testing in-editor

I'm using the Unreal Engine VR Template to make a really easy room in VR. Everything seems to be working fine inside Unreal when I play it there on my Quest 2. But when I build the game and play it on ...
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how much margin is needed for lightmap UVs in relation to the object's scale?

How much margin do lightmap UVs need to prevent light leaks in UE4? Is there a way to calculate the margin from the object's scale or its lightmap resolution in UE4?
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Casting from APawn* to MyCustomCharacter* ? Is this ok?

So I am still learning C++ but been using it for quite a while. But I have a function which is not working properly (separate question posted here: Calling Client RPC in order to assign a Team value ...
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Third Person Character Fall through the floor

i'm trying to get my main menu level works... but when i play from the main menu and go into the "Game"scene player will fall down throught the floor, but won't if i play directly from the &...
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An object reference is not compatiable with it's child class object reference

So I got into this problem which one variable which pin is the child class of another class. WHich is BP_base item 1(the child class) with BP_base interactable I am wondering where it gets wrong? I'...
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Traversing distance over time in Blueprint graph

I am trying to make a set of simplified physics blueprints, very simplified, as an exercise. I am keeping track of the position of an object and I would like to divide the distance it travels each ...
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What are the best LOD methods for planetary rendering?

I've been studying how to render planets for a while now. In 2013, a similar question, Which is the best LOD method for planet rendering? was asked. And the answers were: 1. CDLOD 2. GPUGCM 3. ...
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Embed Unreal in a GTK interface?

I'm trying to provide visualization for an existing application with a GTK 3 interface. I've embedded SDL in GTK before by connecting the SDL screen surface to a GTK Drawing Area and was wondering if ...
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Why do my axis mappings to remap the MoveForward and MoveRight keys not seem to have any effect in-game on Unreal Editor 4.27.2?

Since I have an azerty keyboard instead of a qwerty one I'm trying to remap wasd to zqsd for the in-game playing in Unreal Editor 4.27.2. I've started a new blank c++ project with starter content. ...
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Unreal 4: How to save generated UProceduralMeshComponent to level file in editor and load it at runtime?

I have UProceduralMeshComponent that I generate in editor from data entered by level designer. Now I need to save it to level file in editor to load it in runtime without generating new mesh again. Is ...
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Is there a way to calculate velocity for root motion controlled character in Unreal Engine?

So I see variations of this question all over the place, but no satisfying answers, so here goes. When using root motion to move your character in Unreal Engine the Velocity property of the Movement ...
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Unreal Engine 4.27 (blueprint scripting) - How to constrain physics rotation but still allow to manually set rotation?

I want to constrain the rotation of a physics object so it can only rotate on the Z axis when simulating physics, but I still want to be able to manually set the rotation without any constraints. But ...
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Pulling multiple Actors together on collision

I have my collision sphere setup around my cube and what I want to do is make the cubes all come together as they appear as long as they are all in a specific radius. When I do on collision EVERYTHING ...
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Adding a 'Root Bone' to two existing arm skeletons. For use in Unreal Engine

Hello I am trying to learn to make FPS style animation, gunfire etc. in Unreal Engine. I procured some free FPS Arms 'rigged' 3D model from another website. As you'll see from the picture it has some ...
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UDK: BSP from Brush-CSG Add cannot be deleted

Once a BSP has been created using Brush-CSG add it cannot be deleted. Del-DELETE from the keyboard yields no effect. Right click-cut yields no effect. Is there another way?
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Access the Sequencer's current frame number in Material Editor

Is it possible to access the current frame that the sequencer is on? I want to use it instead of the "Time" node in the Material Editor. I need to create a foliage wind effect that loops at ...
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Making a simple custom animation in Maya for use in Unreal

Ok so I thought this would be a simple task but in the end I am very confused. I am trying to learn to make some game assets in Maya with custom animations I would make inside Maya and import into the ...
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Unreal engine Packaging error for android ETC2

I get the following error while packaging my Unreal Engine project for Android: UATHelper: Packaging (Android (ETC2)): BUILD FAILED in 35s UATHelper: Packaging (Android (ETC2)): ERROR: /bin/sh failed ...
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Export control rig from Maya to unreal engine

I have a control rig in Maya and I want to import the same rig to Unreal for Keyframe animations. Is there a way to transfer the rig from Maya to Unreal. Thanks in advance.
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Easy code to make object raise when collecting item? (new coder)

Trying to make the statue (queen) in the background raise from the ground when an item is collected (which currently just gets destroyed to show that) and having issues with timelines and assigning ...
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How to convert local location to global location given orientation?

I'm working with Unreal Engine and I've come across a scenario where I have a location vector point in local coordinates and I need to transform it to global ...
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How does Unreal Engine 5 Nanite works?

I have seen Unreal Engine 5 showcasing their nanite system a long time ago. Like everyone, I was impressed. Since this is something that would revolutionize the gaming industry, I expected it to come ...
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How to take opacity animation from Blender into Unreal blueprints?

Like the GIF above, I made Skeleton Anim and Material Opacity Anim in the DCC tool. However, FBX file format doesn't support opacity anim, so I have the task of rebuilding opacity anim in the UE. To ...
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Unreal Engine 4.26: How to serialize and load the array of custom UObjects (TArray<UObject*>) in C++?

I have a UProperty in struct which is a TArray<UCoverInfo*> where UCoverInfo is inherited from UObject: ...
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Rendering 3D items in a GUI in Unreal Engine

I have various buildable 3D items in my game like so: These are just a few, but there will eventually be hundreds of them. The models of each of these items are displayed to the user as part of a ...
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How to change uwidget alignment on/after construction?

Have no idea how to align/realign uwidgets via c++. I have a following widget structure: UButton->UOverlay->UImage. Have to make UOverlay to HFill and VFill the UButton
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UWidget::SynchronizeProperties() is not being called on in editor property change

I have to change the children list every time the enum variable property is changed from widget editor. None of the functions I've tried so far seem to have worked (virtual void OnEndEditByDesigner(); ...
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UE5 - stop hiding the Content Draw

Semi-Solution: Going to Window > Layout > UE4 Classic Layout opens out the content browser and other stuff without them closing down again. However, I'm still not sure how to set it to stay or ...
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How can I set the Actor Label when a new Actor is created?

I'm creating a new type inheriting from AActor in c++. (Unreal 4.26) In the PostActorCreated() function I call ...
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How to compute an incremental movement: \$f(t+h)-f(t)\$ or \$f(t)-f(t-h)\$?

For the sake of getting precise position, I think I need you to clarify whether or not the tutorial calculation is incorrect and my calculation is correct. Assume we want to move an Actor up and down ...
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How can I bind fields of USTRUCT with text fields in widget UMG?

I have USTRUCT object. Its fields are filled in c++ code from a JSON object and I need to bind its fields with the content of text fields in a widget. So the flow of my program should be like this: ...
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How do I work with Runtime Virtual Textures in UE5?

I just created a Runtime Virtual Texture, but when I double click to edit it, I get no options at all. How can I reach the options and work with it, what am I missing here?
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Create and configure new Niagara Emitters from C++

I’m trying to create a magic system that lets the player add spells and modifiers to a spell stack and combine them following a set of rules, creating new spells in the process (that maybe can be ...
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UE4 Best way to store the winner of a multiplayer game?

Ok I have a Game Mode, and a Game State, the game mode counts player kills and when a player reaches 10, the game mode enters the end state. It stores the winner on the game state, which the clients ...
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Can I call event from itself

I need to change Game Phases during Game Round. The problem is phases haven't same time duration. So as far as I see, there could be timers by event, but I can't change time interval for them. As ...
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Getting cameras from World (Unreal Engine) to set up a static camera only game

I'm afraid I have another Unreal related question. I'm trying to use ACharacter for my characters but the game uses ONLY static cameras (ie. they shouldn't even ...
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Inheritance in Unreal C++. "GetOwningActor" doesnt return type "AMyPlayer"

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how to download owned assets from unreal engine marketplace on linux?

From any browser, after you own an asset, clicking on download does nothing. To me, as many suggest, installing windows is not ok, but that is just my opinion. Is there any alternative that could let ...
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