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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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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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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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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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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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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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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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
24 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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299 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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33 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
54 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
40 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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42 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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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
28 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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29 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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47 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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21 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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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
17 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
72 views

In a MovementComponent, where should I initialize member variables?

I have a MovementComponent derived from CharacterMovementComponent MovementComponent, ...
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25 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
78 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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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
98 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
38 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
43 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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34 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
39 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
50 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
76 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
44 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
53 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
36 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
144 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 ...
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1answer
65 views

Is Unreal engine or Unity better for high graphics low file size mobile games? [closed]

My objective of learning game development is to make a 3d relatively high graphics mobile game but that should be in 150 mb. I don't know should I start with unity or unreal engine. I found that ...
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73 views

Achieving bokeh effect in Unreal 4.23

Bokeh been removed and Gaussian been made mobile only in Unreal 4.23. Is there any way to get around this and achieve similar effects using the stripped back DOF?
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1answer
67 views

How to set the runtime of an animation based on attack speed?

Based on an answer I received on this question: How to make an action perform only after an animation has run? I am using notifications in animations to perform certain commands/actions. See in the ...
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Unreal Engine “Supports AR” is missing from settings

Unreal Engine v4.21.2 I'm trying to follow this tutorial here: https://docs.unrealengine.com/en-US/Platforms/AR/HandheldAR/FaceARSample/index.html under "Face AR Capture Setup" step 3. says: Launch ...
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2answers
50 views

How to make an action perform only after an animation has run?

I have an actor who has some animations. Animations perform based on some actor states (animation blueprint of actor): Conditions at the Event Tick (similar to while loop): The actor changes ...
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1answer
500 views

How to resolve “Accessed None trying to read property” error?

Whenever I finish running the project, this error message appears: Blueprint Runtime Error: "Accessed None trying to read property jogador". Blueprint: Jogador_BP_Anim Function: Execute ...
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1answer
51 views

How to get the actor to follow the mouse while clicking and holding?

I am trying to do the top down project from scratch. I can already get the actor to move toward the mouse click: Only I need to keep clicking several times to change its path and keep walking ...
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1answer
74 views

Unreal modular character tutorial errors

I'm trying to follow the modular character tutorial for Unreal from this link Specifically the mesh merge portion. How ever the code that is provided seems to not be working. For example when I add ...
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12 views

How to activate ENABLE ROOT MOTION on state machine?

In this question (also asked by me), I was having trouble putting the animation on my object: https://blender.stackexchange.com/questions/150901/error-in-exported-animation-position-size-blender-to-...
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1answer
47 views

Unreal crashes on build: unable to connect to the swarm

I am having trouble with Unreal engine 4. 22 After clicking on build, it CRASHES and says "unable to connect to the swarm" How can I fix this?
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1answer
56 views

What is the most efficient way to trigger an action based on proximity?

I am developing a 3rd person platformer that entails a grapple hook system. This grapple hook system relies on a series of 'grapple-able' points. I would like these points to shine every so often. ...
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23 views

Visible object only through the wall

I need to view my object only through the wall (and this object must has his original material). I tried to use CustomDepth - SceneDepth on Opactiy in material of the wall to do transparent place on ...
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0answers
21 views

UE4 | Glitch with movable cube

I've been trying to make something so that when you press a button, a cube appears. Problem is, whenever I jump on said cube, it sends me flying away so far my character gets deleted (not a game ...
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1answer
39 views

How to use CreateGridMesh in RuntimeMeshComponent

I don't know to pass on the 5th parameter. I'm still new with C++ so if someone could help me with the pointer ...
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1answer
34 views

ue4editor.exe GPU selection

Even though I set ue4editor.exe to use integrated graphics on my laptop, it somehow ends up using the discrete nvidia gpu; is there a way to set the preferred gpu with the unreal suite?