unreal

Unreal Engine Development Skill

Engine Detection

Look for: .uproject, .Build.cs, .uplugin, Source/, Content/, Config/DefaultEngine.ini, Binaries/

Project Structure

MyGame/
  Source/
    MyGame/
      Public/           # Headers (.h)
        Player/
        Enemies/
        UI/
        Systems/
      Private/          # Implementation (.cpp)
        Player/
        Enemies/
        UI/
        Systems/
      MyGame.Build.cs
      MyGame.h
  Content/
    Blueprints/
    Maps/
    Materials/
    Textures/
    Meshes/
    Audio/
    UI/
  Config/
    DefaultEngine.ini
    DefaultGame.ini
    DefaultInput.ini
  Plugins/
  MyGame.uproject

Actor/Component Architecture

Unreal uses an Actor/Component model. Actors are placed in the world, Components add functionality:

// Header - Public/Player/MyCharacter.h
UCLASS()
class MYGAME_API AMyCharacter : public ACharacter
{
    GENERATED_BODY()

public:
    AMyCharacter();

protected:
    virtual void BeginPlay() override;
    virtual void Tick(float DeltaTime) override;
    virtual void SetupPlayerInputComponent(UInputComponent* Input) override;
    virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Stats")
    float MaxHealth = 100.f;

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
    UHealthComponent* HealthComponent;

    UFUNCTION(BlueprintCallable, Category = "Combat")
    void TakeDamage(float Amount, AActor* DamageCauser);

private:
    UPROPERTY()
    float CurrentHealth;
};

// Implementation - Private/Player/MyCharacter.cpp
AMyCharacter::AMyCharacter()
{
    PrimaryActorTick.bCanEverTick = true;
    HealthComponent = CreateDefaultSubobject<UHealthComponent>(TEXT("HealthComp"));
}

void AMyCharacter::BeginPlay()
{
    Super::BeginPlay();
    CurrentHealth = MaxHealth;
}

UPROPERTY Specifiers

// Editable in editor, readable/writable in Blueprints
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Stats")
float Speed;

// Only visible in editor, read-only in Blueprints
UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
USceneComponent* Root;

// Replicated for multiplayer
UPROPERTY(Replicated)
int32 Score;

// Replicated with notification
UPROPERTY(ReplicatedUsing = OnRep_Health)
float Health;