DEV Community: WinterTurtle23

Using AirSim with Unreal Engine: A Guide to Drone & Autonomous Vehicle Simulation

WinterTurtle23 — Sun, 22 Jun 2025 12:45:25 +0000

As autonomous systems and robotics grow, developers need realistic, flexible environments to test algorithms safely. This is where AirSim, an open-source simulator developed by Microsoft, becomes incredibly valuable.

In this blog post, I’ll walk you through what AirSim is, how to integrate it with Unreal Engine, and how I used it in my project to simulate realistic drone physics for training and navigation systems.

🧠 What Is AirSim?

AirSim (Aerial Informatics and Robotics Simulation) is a plugin for Unreal Engine that provides realistic physics, sensor data, and environment simulation for drones, cars, and other autonomous systems.

Open-source (MIT license)
Supports drone and car simulations
Includes APIs for Python, C++, and ROS
Simulates RGB, depth, segmentation, lidar, IMU, GPS, and barometer
Ideal for AI, computer vision, reinforcement learning, and testing flight code

🔧 Getting Started with AirSim in Unreal Engine

🧱 Step 1: Clone and Build AirSim

git clone https://github.com/microsoft/AirSim.git
cd AirSim
./setup.sh    # or setup.bat for Windows
./build.sh    # or build.cmd for Windows

This compiles the AirSim plugin and samples.

🛠 Step 2: Create or Use an Unreal Project

You can either:

Use the Blocks environment from AirSim samples
Or create your own custom Unreal map

📦 Step 3: Integrate AirSim Plugin into Your UE Project

Copy the AirSim folder into your Unreal project under /Plugins/
Regenerate project files (.uproject → right-click → Generate Visual Studio project)
Open the project in Unreal Engine and enable the plugin if prompted

🧠 How AirSim Handles Drone Physics

AirSim uses a PX4-based physics model for multirotors. It mimics:

Pitch, roll, yaw control
Aerodynamic drag and lift
GPS drift and latency
Motor delay simulation

🧪 Using the API

AirSim offers a Python and C++ API. Here's a basic Python example to control the drone:

void ADroneController::BeginPlay()
{
    Super::BeginPlay();

    // Create and connect AirSim client
    msr::airlib::MultirotorRpcLibClient* DroneClient = new msr::airlib::MultirotorRpcLibClient();
    DroneClient->confirmConnection();

    // Enable control and arm the drone
    DroneClient->enableApiControl(true);
    DroneClient->armDisarm(true);

    // Take off
    DroneClient->takeoffAsync()->waitOnLastTask();

    // Fly to a target position
    DroneClient->moveToPositionAsync(0, 0, -10, 5)->waitOnLastTask();

    // Land after reaching destination
    DroneClient->landAsync()->waitOnLastTask();

    // Release control
    DroneClient->enableApiControl(false);
}

You can automate missions, collect sensor data, or train AI models on top of this API.

🧰 Sensors Available in AirSim

RGB & Depth camera
Segmentation mask
Lidar (360° scan)
GPS
IMU
Magnetometer
Distance sensor (ultrasonic)
Barometer

These can be configured via the settings.json file in the AirSim root:

{
  "SettingsVersion": 1.2,
  "Vehicles": {
    "Drone1": {
      "VehicleType": "SimpleFlight",
      "X": 0, "Y": 0, "Z": 0
    }
  }
}

🌦️ Enhancing Simulation Realism with Unreal

In my project, I used Unreal features to elevate the realism:

Dynamic lighting and weather using Blueprint systems
Obstacles with collision meshes to test navigation
Post-processing effects to simulate camera noise

🧠 Use Cases of AirSim

Reinforcement Learning – Train agents to fly or drive using safe simulations
Robotics Research – Test autonomous code before deploying to hardware
Surveillance & Mapping – Simulate GPS + camera-based tracking
Logistics & Delivery – Prototype drone delivery systems
Education & Training – Create VR/PC training simulations for drones

🧩 Tips & Best Practices

Run AirSim in UE Editor → VR Preview / Standalone Mode for stability
Use SimMode Blueprint/C++ class to customize vehicle spawning
Check airsim.log and settings.json for API config issues
Use stat unit and stat fps to keep your simulation optimized

📦 Final Thoughts

AirSim + Unreal Engine is a powerhouse combo for anyone working in autonomous vehicles, AI, or simulation. Whether you're building a drone racing prototype or testing machine vision models, this toolset allows for real-world logic testing in safe, scalable virtual environments.

In my experience with Dronewood and simulation-based client projects, AirSim helped bridge the gap between Unreal’s visual power and robotics code realism.

If you're exploring AirSim for Unreal and need help setting it up, integrating APIs, or deploying to hardware — feel free to connect. I’d love to hear about your projects!

Flying with FloatingPawnMovement in Unreal Engine: A Dronewood Dev Breakdown

WinterTurtle23 — Sat, 31 May 2025 14:56:47 +0000

When it comes to creating flying actors in Unreal Engine — from drones to hovercrafts — one of the most versatile components is the FloatingPawnMovement component.

In this blog post, I’ll break down what FloatingPawnMovement is, how it works, when to use it, and how I used it in my drone simulation game Dronewood to build a smooth, physics-aware flying experience.

🧭 What is FloatingPawnMovement?

UFloatingPawnMovement is a lightweight movement component provided by Unreal Engine that allows basic movement of Pawns in 3D space. Unlike CharacterMovementComponent, it doesn’t rely on a capsule or gravity by default, making it ideal for:

Drones
Spaceships
Hover vehicles
Zero-gravity entities

It supports movement input (AddMovementInput), simulates acceleration/deceleration, and integrates cleanly with both Blueprints and C++.

🧱 Setting It Up

Whether you're working in Blueprints or C++, adding FloatingPawnMovement is straightforward.

🔧 Blueprint Setup:

Create a new Pawn blueprint (not Character).
Add a FloatingPawnMovement component.
Add input bindings like "MoveForward", "MoveRight", and "MoveUp".
Use AddMovementInput(GetActorForwardVector(), AxisValue) to move.

🧠 C++ Setup:

Here’s how to wire it up in your Pawn class:

AFlyingPawn::AFlyingPawn()
{
    RootComponent = CreateDefaultSubobject<USceneComponent>(TEXT("RootComponent"));

    MeshComponent = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    MeshComponent->SetupAttachment(RootComponent);

    FloatingMovement = CreateDefaultSubobject<UFloatingPawnMovement>(TEXT("FloatingPawnMovement"));
}

void AFlyingPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    PlayerInputComponent->BindAxis("MoveForward", this, &AFlyingPawn::MoveForward);
    PlayerInputComponent->BindAxis("MoveRight", this, &AFlyingPawn::MoveRight);
    PlayerInputComponent->BindAxis("Ascend", this, &AFlyingPawn::MoveUp);
}

void AFlyingPawn::MoveForward(float Value)
{
    AddMovementInput(GetActorForwardVector(), Value);
}

void AFlyingPawn::MoveRight(float Value)
{
    AddMovementInput(GetActorRightVector(), Value);
}

void AFlyingPawn::MoveUp(float Value)
{
    AddMovementInput(GetActorUpVector(), Value);
}

🚁 Real-World Use Case: Dronewood

In Dronewood, I built a fully functional drone simulation where the player controls a drone through tight obstacle-filled environments using:

Ascend/descend
Tilt forward/backward
Rotate (yaw) left/right
Speed boost for time trials

Why FloatingPawnMovement?

While physics-based movement can feel sluggish and unpredictable for this kind of gameplay, FloatingPawnMovement offered:

Smooth, responsive input handling
Built-in acceleration and deceleration
Easy integration with custom rotation and tilt systems

Dronewood’s Drone Control Breakdown:

Ascend/Descend: AddMovementInput(GetActorUpVector(), Value)
Forward Movement: AddMovementInput(GetActorForwardVector(), Value)
Speed Boost: Modified MaxSpeed dynamically
Tilt Control: Adjusted the mesh's relative rotation for visual realism

// Speed boost toggle
FloatingMovement->MaxSpeed = bBoosting ? 1600.f : 800.f;

I also added a custom camera controller and collision handling logic to avoid unintended flips or drift when bouncing off obstacles.

🧠 When Not to Use It?

If you need full physics simulation (e.g. quadcopter thrust physics)
If you want full character animation support
If you need complex floor detection, jumping, or crouching (use CharacterMovementComponent instead)

🧰 Pro Tips

Combine with SpringArm + Camera for 3rd-person view.
Clamp pitch/roll to avoid disorienting the player.
Customize Acceleration, Deceleration, and MaxSpeed for arcade or sim feel.
Use OnComponentHit events for obstacle reaction or bounce-back effects.

📦 Final Thoughts

FloatingPawnMovement might not be as flashy as CharacterMovementComponent, but it's one of Unreal's most underappreciated tools for flying mechanics. Whether you're building a drone game like Dronewood, a sci-fi spaceship, or a magic carpet — this component gives you speed, control, and simplicity.

If you're exploring flying movement in Unreal and want tips on tilt mechanics, multiplayer sync, or custom input systems — I’d love to connect. Happy flying!

Getting Started with Virtual Reality in Unreal Engine: Building Immersive Worlds

WinterTurtle23 — Sat, 31 May 2025 14:18:21 +0000

Virtual Reality (VR) is more than just a tech trend — it’s a medium for creating truly immersive experiences. From training simulations to games and architectural walkthroughs, VR enables us to step inside digital worlds.

Unreal Engine stands out as a powerhouse for VR development, offering photoreal visuals, robust input systems, and powerful performance optimization tools.

In this blog, I’ll walk you through what makes Unreal great for VR, how to get started, the tools I use, and lessons from my real-world VR projects like Active Shooter, Surgical Simulation, and VR Library.

🚀 Why Choose Unreal for VR?

Unreal Engine provides:

Native VR support out-of-the-box (Meta Quest, Vive, Pico, Valve Index, etc.)
High-fidelity rendering for immersive visuals
Blueprint & C++ integration for flexible interaction design
Support for hand tracking, motion controllers, and haptics
Built-in VR template to kickstart your project

Whether you're building for PC VR or standalone headsets, Unreal gives you everything you need — no plugins necessary.

🧰 Tools & Hardware I Use for VR Projects

Here’s my go-to setup for professional VR development:

🔧 Hardware:

Meta Quest 2 & 3
Forcetube Provolver (for realistic gun recoil)
KAT VR Treadmill (for natural locomotion input)

🛠️ Tools & Plugins:

Unreal Engine 5
JetBrains Rider – my IDE of choice for C++
OpenXR – for device integration

🎮 Project Showcase: Real-World VR Projects

Here are some real VR projects I’ve built using Unreal Engine:

1. Active Shooter (VR Police Training Simulation)

Created for Abu Dhabi Police
Features multiplayer VR, Forcetube Provolver, KAT treadmill
Realistic shooting, NPC AI, and mission-based training modules

2. Surgical Simulation

Hand-tracking VR training where players perform CPR and use an AED
Built for hospital emergency response training
Involves NPC interaction, voice guidance, and real-world task accuracy

3. VR Library (Cultural Education)

An ancient virtual library built for National Book Trust
Users interact with a librarian NPC and explore Indian stories through visuals and voiceovers
Focus on narrative and visual immersion

🧠 VR Input in Unreal Engine

Unreal provides support for:

Motion Controllers: Access button presses, trigger values, and positional data
Hand Tracking (Quest/Pico): Access open-palm gestures and pinch inputs
Haptic Feedback: Vibrations on interactions
Locomotion Methods:
Smooth Locomotion (joystick)
Teleportation
KAT treadmill integration for full-body movement

📏 Performance Tips for VR

Performance in VR is non-negotiable. Here’s what I always optimize:

Target 72–90 FPS at minimum
Use Level of Detail (LOD) and Hierarchical Instanced Static Meshes (HISM)
Cull distant objects using Distance Culling
Use Stat Unit, Stat FPS, and VR Preview mode often
Bake lighting where possible (unless using Lumen strategically)

🧪 Testing and Debugging VR

Use VR Preview in the editor or Oculus Link / SteamVR
Print logs via GEngine->AddOnScreenDebugMessage()
Use Camera Manager to debug head/camera tracking

📦 Final Thoughts

Virtual Reality in Unreal Engine isn’t just powerful — it’s transformative. With the right tools, design thinking, and optimization practices, you can build immersive, believable, and useful VR worlds.

Whether you're simulating a medical emergency or letting users walk through a historical site, Unreal gives you everything you need to bring your vision to (virtual) life.

If you're starting your own VR journey and need help with hand tracking, networked VR, or performance tuning — feel free to connect or drop your questions below!

Unreal Engine Replication Pipeline

WinterTurtle23 — Thu, 22 May 2025 19:11:42 +0000

🔄 Understanding Unreal Engine's Replication Pipeline

Multiplayer games live and die by their network code — and Unreal Engine’s replication system is one of the most powerful and flexible networking architectures in the game dev world. Whether you're syncing player positions, firing weapons, or managing inventories, replication ensures your game state stays consistent across the server and all clients.

In this post, I’ll walk you through Unreal Engine's replication pipeline, explain how it works under the hood, and share best practices I’ve used in multiplayer projects like Offensive Warfare and Relic Hunters.

🧠 What Is Replication?

Replication in Unreal Engine refers to the process of sending data from the server to clients (and vice versa) to keep game state consistent. UE is a server-authoritative engine, meaning the server owns the truth, and clients receive only the allowed view of that truth.

🛠️ Key Components of the Replication Pipeline

1. UProperties with `Replicated` or `ReplicatedUsing`

You can mark variables to replicate automatically:

UPROPERTY(Replicated)
float Health;

UPROPERTY(ReplicatedUsing = OnRep_Score)
int32 Score;

With ReplicatedUsing, you can trigger a callback when the variable updates on clients:

UFUNCTION()
void OnRep_Score();

2. `GetLifetimeReplicatedProps()`

This function tells the engine what properties should replicate and how:

void AMyCharacter::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME(AMyCharacter, Health);
}

3. Remote Procedure Calls (RPCs)

🖥️ Server RPCs

Run logic on the server, called from the client:

UFUNCTION(Server, Reliable)
void Server_Fire();

🛰️ Client RPCs

Run logic on a specific client, called by the server:

UFUNCTION(Client, Reliable)
void Client_ReceiveDamage(float DamageAmount);

📡 Multicast RPCs

Run logic on all clients, called by the server:

UFUNCTION(NetMulticast, Reliable)
void Multicast_PlayExplosion();

🔄 The Replication Flow

Here’s a simplified step-by-step overview of what happens during replication:

Server Updates State – The authoritative game state is changed (e.g., Health drops).
Replication Conditions Checked – Unreal decides if and where the update should be sent.
Properties Marked as Dirty – UE marks only changed properties for replication (optimization).
Data Packaged & Sent – UE serializes the property/RPC data and sends it over the network.
Clients Receive & Apply – The client deserializes the data and updates its local copy.
OnRep Callbacks Triggered – If ReplicatedUsing is set, the callback function runs.

⚙️ Tips for Effective Replication

✅ Use COND_SkipOwner to avoid sending data back to the client who already knows it.

✅ Keep replicated variables minimal and optimized. Bandwidth is precious.

✅ Use Reliable RPCs only for critical actions (like firing a gun), not for frequent updates.

✅ Use Network Profiler and stat net to monitor replication costs.

🧵 Real-World Use Case: Shooting System

In my game Offensive Warfare, the firing mechanism works like this:

Player presses Fire (on Client)
Calls Server_Fire() RPC
Server runs logic → updates ammo count → calls Multicast_PlayFireEffect()
All clients (including the shooter) play fire VFX/SFX
Ammo HUD updated via OnRep_Ammo

📌 Final Thoughts

Unreal Engine’s replication pipeline is powerful but performance-sensitive. Once you understand how data flows from server to client (and vice versa), you can build scalable and reliable multiplayer games — from fast-paced shooters to synchronized simulations.

If you're working on a multiplayer Unreal project and have questions about replication, session systems, or optimization, drop a comment or DM — happy to help!

Building a Multiplayer System in Unreal Engine with Steam & LAN

WinterTurtle23 — Wed, 21 May 2025 16:19:01 +0000

🎮 Building a Multiplayer System in Unreal Engine with Steam & LAN

Multiplayer game development can seem intimidating, but Unreal Engine makes it surprisingly approachable. Whether you're aiming to create a simple LAN party game or a full-fledged Steam multiplayer shooter, Unreal’s built-in networking systems have you covered.

In this blog, I’ll walk you through how I implemented multiplayer using Steam and LAN subsystems in Unreal Engine — from project setup to handling replication.

⚙️ Why Use Steam and LAN?

Steam Subsystem:
Used for online multiplayer across the internet. It supports matchmaking, achievements, leaderboards, and more.

LAN Subsystem:
Best for local play or internal testing. It’s fast, requires no internet connection, and works great for prototypes and offline setups.

In my game Offensive Warfare, I implemented both to allow players flexibility: testing on LAN and releasing over Steam.

🛠 Project Setup

1. Enable Required Plugins

Go to Edit > Plugins, and enable:
- Online Subsystem
- Online Subsystem Steam
- (Optional) Online Subsystem Null for fallback

2. Configure `DefaultEngine.ini`

[/Script/Engine.GameEngine]
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")

[OnlineSubsystem]
DefaultPlatformService=Steam

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480

; If using Sessions
; bInitServerOnClient=true

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"

For LAN testing, change DefaultPlatformService=Null.

🎮 Creating Multiplayer Logic

Creating the Game Instance Subsystem

Instead of cluttering the GameInstance class, I created a custom UGameInstanceSubsystem to keep the session logic modular and reusable across the project.

#pragma once

#include "CoreMinimal.h"
#include "Subsystems/GameInstanceSubsystem.h"
#include "OnlineSubsystem.h"
#include "Interfaces/OnlineSessionInterface.h"
#include "OnlineSessionSettings.h"
#include "Online/OnlineSessionNames.h"

#include "MultiplayerSessionSubsystem.generated.h"

/**
 * 
 */
UCLASS()
class Game_API UMultiplayerSessionSubsystem : public UGameInstanceSubsystem
{
    GENERATED_BODY()

public:
    UMultiplayerSessionSubsystem();
    void Initialize(FSubsystemCollectionBase& Collection) override;
    void Deinitialize() override;

    IOnlineSessionPtr SessionInterface;

    UFUNCTION(BlueprintCallable)
    void CreateServer(FString ServerName);

    UFUNCTION(BlueprintCallable)
    void FindServer(FString ServerName);

    void OnCreateSessionComplete(FName SessionName, bool bWasSuccessful);

    void OnDestroySessionComplete(FName SessionName, bool bWasSuccessful);

    bool CreateServerAfterDestroy;
    FString DestroyServerName;
    FString ServerNameToFind;

    FName MySessionName;

    TSharedPtr<FOnlineSessionSearch> SessionSearch;

    void OnFindSessionComplete(bool bWasSuccessful);

    void OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result);

    UPROPERTY(BlueprintReadWrite)
    FString GameMapPath;

    UFUNCTION(BlueprintCallable)
    void TravelToNewLevel(FString NewLevelPath);
};

#include "MultiplayerSessionSubsystem.h"

void PrintString(const FString & String)
{
    GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red,String);
}

UMultiplayerSessionSubsystem::UMultiplayerSessionSubsystem()
{
    //PrintString("Subsystem Constructor");
    CreateServerAfterDestroy=false;
    DestroyServerName="";
    ServerNameToFind="";
    MySessionName="MultiplayerSubsystem";
}

void UMultiplayerSessionSubsystem::Initialize(FSubsystemCollectionBase& Collection)
{
    //PrintString("UMultiplayerSessionSubsystem::Initialize");

    IOnlineSubsystem* OnlineSubsystem = IOnlineSubsystem::Get();
    if (OnlineSubsystem)
    {
        FString SubsystemName= OnlineSubsystem->GetSubsystemName().ToString();
        PrintString(SubsystemName);

        SessionInterface= OnlineSubsystem->GetSessionInterface();
        if (SessionInterface.IsValid())
        {
            SessionInterface->OnCreateSessionCompleteDelegates.AddUObject(this,&UMultiplayerSessionSubsystem::OnCreateSessionComplete);

            SessionInterface->OnDestroySessionCompleteDelegates.AddUObject(this,&UMultiplayerSessionSubsystem::OnDestroySessionComplete);

            SessionInterface->OnFindSessionsCompleteDelegates.AddUObject(this,&UMultiplayerSessionSubsystem::OnFindSessionComplete);

            SessionInterface->OnJoinSessionCompleteDelegates.AddUObject(this,&UMultiplayerSessionSubsystem::OnJoinSessionComplete);
        }
    }
}

void UMultiplayerSessionSubsystem::Deinitialize()
{
    //UE_LOG(LogTemp, Warning,TEXT("UMultiplayerSessionSubsystem::Deinitialize") );
}

void UMultiplayerSessionSubsystem::CreateServer(FString ServerName)
{
    PrintString(ServerName);

    FOnlineSessionSettings SessionSettings;
    SessionSettings.bAllowJoinInProgress = true;
    SessionSettings.bIsDedicated = false;
    SessionSettings.bShouldAdvertise = true;
    SessionSettings.bUseLobbiesIfAvailable = true;
    SessionSettings.NumPublicConnections=2;
    SessionSettings.bUsesPresence = true;
    SessionSettings.bAllowJoinViaPresence = true;
    if(IOnlineSubsystem::Get()->GetSubsystemName()=="NULL")
        SessionSettings.bIsLANMatch=true;
    else
    {
        SessionSettings.bIsLANMatch=false;
    }

    FNamedOnlineSession* ExistingSession= SessionInterface->GetNamedSession(MySessionName);
    if (ExistingSession)
    {
        CreateServerAfterDestroy=true;
        DestroyServerName=ServerName;
        SessionInterface->DestroySession(MySessionName);
        return;
    }

    SessionSettings.Set(FName("SERVER_NAME"),ServerName,EOnlineDataAdvertisementType::ViaOnlineServiceAndPing);

    SessionInterface->CreateSession(0,MySessionName, SessionSettings);
}

void UMultiplayerSessionSubsystem::FindServer(FString ServerName)
{
    PrintString(ServerName);

    SessionSearch= MakeShareable(new FOnlineSessionSearch());
    if(IOnlineSubsystem::Get()->GetSubsystemName()=="NULL")
        SessionSearch->bIsLanQuery=true;
    else
    {
        SessionSearch->bIsLanQuery=false;
    }
    SessionSearch->MaxSearchResults=100;
    SessionSearch->QuerySettings.Set(SEARCH_PRESENCE,true, EOnlineComparisonOp::Equals);

    ServerNameToFind=ServerName;

    SessionInterface->FindSessions(0,SessionSearch.ToSharedRef());
}

void UMultiplayerSessionSubsystem::OnCreateSessionComplete(FName SessionName, bool bWasSuccessful)
{
    PrintString(FString::Printf(TEXT("OnCreateSessionComplete: %d"), bWasSuccessful));

    if(bWasSuccessful)
    {
        FString DefaultGameMapPath="/Game/ThirdPerson/Maps/ThirdPersonMap?listen";

        if(!GameMapPath.IsEmpty())
        {
            GetWorld()->ServerTravel(GameMapPath+"?listen");
        }
        else
        {
            GetWorld()->ServerTravel(DefaultGameMapPath);
        }
    }
}

void UMultiplayerSessionSubsystem::OnDestroySessionComplete(FName SessionName, bool bWasSuccessful)
{
    if(CreateServerAfterDestroy)
    {
        CreateServerAfterDestroy=false;
        CreateServer(DestroyServerName);
    }
}

void UMultiplayerSessionSubsystem::OnFindSessionComplete(bool bWasSuccessful)
{
    if(!bWasSuccessful)
        return;

    if(ServerNameToFind.IsEmpty())
        return;

    TArray<FOnlineSessionSearchResult> Results=SessionSearch->SearchResults;
    FOnlineSessionSearchResult* CorrectResult= 0;

    if(Results.Num()>0)
    {
        for(FOnlineSessionSearchResult Result:Results)
        {
            if(Result.IsValid())
            {
                FString ServerName="No-Name";
                Result.Session.SessionSettings.Get(FName("SERVER_NAME"),ServerName);

                if(ServerName.Equals(ServerNameToFind))
                {
                    CorrectResult=&Result;
                    break;
                }
            }
        }
        if(CorrectResult)
        {
            SessionInterface->JoinSession(0,MySessionName,*CorrectResult);
        }
    }
    else
    {
        PrintString("OnFindSessionComplete: No sessions found");
    }
}

void UMultiplayerSessionSubsystem::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result)
{
    if(Result==EOnJoinSessionCompleteResult::Success)
    {
        PrintString("OnJoinSessionComplete: Success");
        FString Address= "";

        bool Success= SessionInterface->GetResolvedConnectString(MySessionName,Address);
        if(Success)
        {
            PrintString(FString::Printf(TEXT("Address: %s"), *Address));
            APlayerController* PlayerController= GetGameInstance()->GetFirstLocalPlayerController();

            if(PlayerController)
            {
                PrintString("ClientTravelCalled");
                PlayerController->ClientTravel(Address,TRAVEL_Absolute);
            }
        }
        else
        {
            PrintString("OnJoinSessionComplete: Failed");
        }
    }
}

void UMultiplayerSessionSubsystem::TravelToNewLevel(FString NewLevelPath)
{
    //Travel to new level with the connected client

    GetWorld()->ServerTravel(NewLevelPath+"?listen",true);
}

Blueprint Bindings (if using)

Use BlueprintImplementableEvents to trigger session create/join from UI.
Bind session delegates to handle success/failure states.

🔁 Handling Replication

Unreal Engine uses server-authoritative networking. Here are the basics to keep in mind:

Use Replicated and ReplicatedUsing properties in C++ to sync data.
RPCs:
- Server functions execute logic on the server.
- Multicast functions replicate to all clients.
- Client functions execute logic on a specific client.

UFUNCTION(Server, Reliable)
void Server_Fire();

UFUNCTION(NetMulticast, Reliable)
void Multicast_PlayMuzzleFlash();

🧪 Testing Locally

For LAN, use Play → Standalone with multiple clients and ensure bIsLANMatch = true.
For Steam, launch separate builds and test using the Steam Overlay (Shift+Tab) and App ID 480 (Spacewar test app).

🧠 Pro Tips

Always use SteamDevAppId=480 until your game is approved on Steam.
Use logging extensively to debug session creation, joining, and replication issues.
Firewall/Antivirus can block Steam connections — test on clean setups.
Test LAN and Steam in shipping builds, not just editor.

📌 Final Thoughts

Implementing multiplayer using Unreal Engine's Steam and LAN systems gives you flexibility during development and release. Whether you’re building a local co-op game or an online competitive shooter, the workflow stays largely the same — just swap the subsystem and fine-tune your logic.

If you’re working on a multiplayer game or have questions about Steam setup, feel free to connect with me in the comments!

Getting Started with Unreal Engine Game Development: My Journey and Insights

WinterTurtle23 — Sat, 10 May 2025 18:39:33 +0000

Unreal Engine has become one of the most powerful and accessible platforms for game developers, from indie devs to AAA studios. In this post, I’ll walk you through what makes Unreal Engine amazing, how I got started, and practical tips if you're planning to dive into this world.

🎮 Why I Chose Unreal Engine

Unreal Engine, especially version 5, offers:

Photorealistic visuals thanks to Lumen and Nanite
Robust multiplayer framework using C++ and Blueprints
VR and mobile support out of the box
An intuitive Blueprint system for non-coders or rapid prototyping
A strong community and ecosystem (plugins, marketplace, forums)

Whether you’re building a narrative game, a tactical shooter, or a training simulation — Unreal can do it all.

🛠 My Unreal Engine Projects

I've worked on a range of games and simulations including:

Offensive Warfare – A 5v5 multiplayer deathmatch shooter (LAN + Steam)
Surgical Simulation VR – A realistic hand-tracking CPR and AED training app
Cruiser – An endless runner game for Android
DP World Digital Twin – A real-time dashboard-linked simulation for Dubai's logistics complex
Relic Hunters – A co-op puzzle and combat multiplayer experience

Each project deepened my understanding of Unreal's networking, optimization, VR, and UI capabilities.

💡 What I Learned

Blueprints are powerful, but mixing them with C++ gives the best of both worlds.
Optimization is crucial for mobile and VR — especially when dealing with high-polygon assets.
Replication is a beast in multiplayer games, but Unreal handles a lot under the hood.
Animation Blueprints and MetaHumans are a game changer for realism.
Always use version control – Unreal projects can break fast.

🧰 Tools & Plugins I Use

JetBrains Rider – My go-to IDE for C++ programming in Unreal Engine. It offers seamless integration with Unreal projects, great IntelliSense, and efficient debugging tools.

Plugins & SDKs:

Steam & EOS SDK – For implementing multiplayer functionality including matchmaking, lobbies, and player authentication across platforms.
VaRest – A powerful plugin for handling REST APIs within Unreal Engine, useful for connecting to web services or sending gameplay data to external servers.
Quixel Bridge – Provides access to thousands of high-quality 3D assets and textures, streamlining environment design with photorealistic visuals.
Firebase – Integrated for backend services such as real-time databases, analytics, and user authentication, especially useful in mobile and multiplayer game scenarios.

📌 Tips for Beginners

Start with the Third Person template
Learn Replication basics before diving into multiplayer
Use Blueprints to prototype, then shift performance-heavy logic to C++
Always profile and optimize – especially for mobile and VR
Unreal Engine Forum – great place to ask questions

👋 Final Thoughts

Unreal Engine has completely changed how I approach game development. Whether you're a programmer, an artist, or someone who loves tinkering with ideas — UE5 gives you the tools to bring your vision to life.

If you’re working on something in Unreal or want to collaborate, let’s connect in the comments!

DEV Community: WinterTurtle23

Using AirSim with Unreal Engine: A Guide to Drone & Autonomous Vehicle Simulation

🧠 What Is AirSim?

🔧 Getting Started with AirSim in Unreal Engine

🧱 Step 1: Clone and Build AirSim

🛠 Step 2: Create or Use an Unreal Project

📦 Step 3: Integrate AirSim Plugin into Your UE Project

🧠 How AirSim Handles Drone Physics

🧪 Using the API

🧰 Sensors Available in AirSim

🌦️ Enhancing Simulation Realism with Unreal

🧠 Use Cases of AirSim

🧩 Tips & Best Practices

📦 Final Thoughts

Flying with FloatingPawnMovement in Unreal Engine: A Dronewood Dev Breakdown

🧭 What is FloatingPawnMovement?

🧱 Setting It Up

🔧 Blueprint Setup:

🧠 C++ Setup:

🚁 Real-World Use Case: Dronewood

Why FloatingPawnMovement?

Dronewood’s Drone Control Breakdown:

🧠 When Not to Use It?

🧰 Pro Tips

📦 Final Thoughts

Getting Started with Virtual Reality in Unreal Engine: Building Immersive Worlds

🚀 Why Choose Unreal for VR?

🧰 Tools & Hardware I Use for VR Projects

🔧 Hardware:

🛠️ Tools & Plugins:

🎮 Project Showcase: Real-World VR Projects

1. Active Shooter (VR Police Training Simulation)

2. Surgical Simulation

3. VR Library (Cultural Education)

🧠 VR Input in Unreal Engine

📏 Performance Tips for VR

🧪 Testing and Debugging VR

📦 Final Thoughts

Unreal Engine Replication Pipeline

🔄 Understanding Unreal Engine's Replication Pipeline

🧠 What Is Replication?

🛠️ Key Components of the Replication Pipeline

1. UProperties with Replicated or ReplicatedUsing

2. GetLifetimeReplicatedProps()

3. Remote Procedure Calls (RPCs)

🖥️ Server RPCs

🛰️ Client RPCs

📡 Multicast RPCs

🔄 The Replication Flow

⚙️ Tips for Effective Replication

🧵 Real-World Use Case: Shooting System

📌 Final Thoughts

Building a Multiplayer System in Unreal Engine with Steam & LAN

🎮 Building a Multiplayer System in Unreal Engine with Steam & LAN

⚙️ Why Use Steam and LAN?

🛠 Project Setup

1. Enable Required Plugins

2. Configure DefaultEngine.ini

🎮 Creating Multiplayer Logic

Creating the Game Instance Subsystem

Blueprint Bindings (if using)

🔁 Handling Replication

🧪 Testing Locally

🧠 Pro Tips

📌 Final Thoughts

Getting Started with Unreal Engine Game Development: My Journey and Insights

🎮 Why I Chose Unreal Engine

🛠 My Unreal Engine Projects

💡 What I Learned

🧰 Tools & Plugins I Use

Plugins & SDKs:

📌 Tips for Beginners

👋 Final Thoughts

1. UProperties with `Replicated` or `ReplicatedUsing`

2. `GetLifetimeReplicatedProps()`

2. Configure `DefaultEngine.ini`