02 — Zero-Config Integration

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You do not need a custom PlayerState, GameState, or GameMode class to use QuestSystemDemo. This chapter explains what does the wiring for you, and how to customize it when you need to.

UDemoQuestWorldSubsystem

UDemoQuestWorldSubsystem is a UWorldSubsystem — it exists automatically in every game world, no setup required. On the server (a standalone single-player session counts as a server), it:

• creates a UDemoQuestManagerComponent on the GameState (the party manager);
• creates a UDemoQuestManagerComponent on every PlayerState as it spawns — this covers login, late join, seamless travel, and PIE;
• enrolls newly-joined players into active party quests that have bAutoEnrollNewParticipants set (see 06 — Multiplayer);
• optionally validates the whole quest dependency graph on startup and logs the result (development builds only).

If a PlayerState or GameState already has a UDemoQuestManagerComponent — because you placed one manually in a custom class or Blueprint — the subsystem leaves it alone. Manual and zero-config setups can coexist.

// Get the subsystem directly if you need it:
UDemoQuestWorldSubsystem* Subsystem = UDemoQuestWorldSubsystem::Get(this);
UDemoQuestManagerComponent* PartyManager = Subsystem->GetPartyQuestManager();
UDemoQuestManagerComponent* MyManager = UDemoQuestWorldSubsystem::GetPlayerQuestManager(MyPlayerState);

In most code you will use UDemoQuestBlueprintLibrary instead (see 08) — it wraps the same lookups with clearer names (GetQuestManager, GetPartyQuestManager).

UDemoQuestSystemSettings

Project Settings → Game → Quest System (Demo) (stored in DefaultGame.ini under [/Script/QuestSystemDemo.DemoQuestSystemSettings]):

Property	Default	Meaning
bAutoCreatePlayerQuestManagers	true	Create a manager on every PlayerState.
bAutoCreatePartyQuestManager	true	Create a manager on the GameState. Required for Shared/Individual quests.
QuestManagerClass	UDemoQuestManagerComponent	The class the subsystem instantiates. Point this at your own subclass — see below.
bValidateQuestsOnStartup	true	Run dependency validation when a world starts (non-shipping builds only).

Timer warning thresholds are authored per quest/objective asset (TimerWarningThreshold, 0 = no warning) rather than as a single project-wide value — see 03 — Authoring Quests.

; Example: DefaultGame.ini
[/Script/QuestSystemDemo.DemoQuestSystemSettings]
bAutoCreatePartyQuestManager=false

Overriding reward logic

GiveQuestRewards() is a BlueprintNativeEvent on UDemoQuestManagerComponent — the natural place to grant XP, gold, or items. Because the subsystem creates the manager for you, you don't subclass PlayerState to reach it; instead, subclass the component and point QuestManagerClass at your subclass. Either a C++ subclass or a Blueprint one works — pick whichever fits your team.

C++ version

// MyQuestManagerComponent.h
UCLASS()
class UMyQuestManagerComponent : public UDemoQuestManagerComponent
{
    GENERATED_BODY()
protected:
    virtual void GiveQuestRewards_Implementation(UDemoQuestData* QuestData) override;
};

// MyQuestManagerComponent.cpp
void UMyQuestManagerComponent::GiveQuestRewards_Implementation(UDemoQuestData* QuestData)
{
    if (APlayerState* PS = GetOwningPlayerState())
    {
        if (AMyPlayerState* MyPS = Cast<AMyPlayerState>(PS))
        {
            // RewardAmounts is a plain TMap<FName, int32> - the plugin has no
            // built-in notion of "gold" or "XP", so route whichever keys your
            // own quest data uses to whatever they mean in your game.
            if (const int32* XP = QuestData->Rewards.RewardAmounts.Find(TEXT("ExperiencePoints")))
            {
                MyPS->AddExperience(*XP);
            }
            if (const int32* Gold = QuestData->Rewards.RewardAmounts.Find(TEXT("Gold")))
            {
                MyPS->AddGold(*Gold);
            }
        }
    }
    // Called on both the PlayerState manager (Personal/Individual) and the
    // GameState manager (Shared) — GetOwningPlayerState() returns nullptr on
    // the party manager, so branch on IsPartyQuestManager() if you need to
    // reward every participant of a Shared quest.
}

Then set QuestManagerClass = MyQuestManagerComponent in Project Settings. No other class needs to change — this works whether the component ends up on a vanilla PlayerState or a custom one.

Blueprint version (no C++ required)

GiveQuestRewards being a BlueprintNativeEvent means a Blueprint class can override it exactly like a C++ subclass can — no engine-side special case needed:

1. Content Browser → Add → Blueprint Class. In the parent-class picker, enable All Classes and search for Quest Manager Component — pick it as the parent.
2. Name it, e.g. BP_MyQuestManagerComponent, and open it.
3. In the Event Graph, right-click → Add Event → search Give Quest Rewards. This places an Event Give Quest Rewards node with a Quest Data output pin.
4. Wire your reward logic from there: Break the Quest Data pin's Rewards struct to get Item Rewards / Reward Amounts, Find a key in Reward Amounts (e.g. "ExperiencePoints", "Gold", or whatever your project calls its resources) to pull out its amount, then call whatever functions your player-stats or inventory system exposes (e.g. Get Player State → cast to your custom PlayerState → Add Experience).
5. Project Settings → Game → Quest System (Demo) → set Quest Manager Class to BP_MyQuestManagerComponent.

The default C++ implementation (logging only) does not run unless you explicitly add Call to Parent Function on the event node — skipping it is fine, you lose nothing but the log line.

Manual placement (opt-out)

If you'd rather keep full control, disable the relevant bAutoCreate* setting and create the component yourself, exactly as before the zero-config subsystem existed:

AMyPlayerState::AMyPlayerState()
{
    QuestManagerComponent = CreateDefaultSubobject<UDemoQuestManagerComponent>(TEXT("QuestManagerComponent"));
    QuestManagerComponent->SetIsReplicated(true);
}

Both approaches produce an identical, fully-functional component — zero-config is simply the recommended default.