Unreal Engine 4.26 Documentation

Unreal Engine 4.27 Documentation

Unreal Engine 5.0 Documentation

> Unreal Engine API Reference > Runtime > Engine > Subsystems > UWorldSubsystem

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UWorldSubsystem

[UWorldSubsystem](API\Runtime\Engine\Subsystems\UWorldSubsystem) Base class for auto instanced and initialized systems that share the lifetime of a [UWorld](API\Runtime\Engine\Engine\UWorld)

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Inheritance Hierarchy

UObjectBase

UObjectBaseUtility

UObject

USubsystem

UWorldSubsystem

UActorPartitionSubsystem

UCameraAnimationSequenceSubsystem

UColorCorrectRegionsSubsystem

UCommonUILayoutManager

UConversationRegistry

UDataLayerSubsystem

UDisplayClusterWorldSubsystem

UGPULightmassSubsystem

UHLODSubsystem

ULevelInstanceSubsystem

UMassActorSpawnerSubsystem

UMassCrowdSpawnerSubsystem

UMassActorSubsystem

UMassAgentSubsystem

UMassCrowdSubsystem

UMassDebuggerSubsystem

UMassEntitySubsystem

UMassMovementSubsystem

UMassReplicationManager

UMassRepresentationSubsystem

UMassCrowdRepresentationSubsystem

UMassSimulationSubsystem

UMassSpawnerSubsystem

UMassStateTreeSubsystem

UNetworkPhysicsManager

UNetworkPredictionWorldManager

UObjectTraceWorldSubsystem

USmartObjectSubsystem

UTickableWorldSubsystem

	UAutoDestroySubsystem
	ULandscapeSubsystem
	UMassComponentHitSubsystem
	UMassLODManager
	UMassSignalSubsystem
	UQuartzSubsystem
	UWaterSubsystem
	UWorldPartitionSubsystem
	UZoneGraphAnnotationSubsystem
	UZoneGraphSubsystem

UViewportStatsSubsystem

References

Module	Engine
Header	/Engine/Source/Runtime/Engine/Public/Subsystems/WorldSubsystem.h
Include	#include "Subsystems/WorldSubsystem.h"

Syntax

class UWorldSubsystem : public USubsystem

Remarks

UWorldSubsystem Base class for auto instanced and initialized systems that share the lifetime of a UWorld

Constructors

	Name	Description
	UWorldSubsystem()

Functions

	Name	Description
bool	DoesSupportWorldType ( const EWorldType::Type WorldType )
UWorld *	GetWorld()
UWorld &	GetWorldRef()	Returns a reference to the UWorld this subsystem is contained within.
void	OnWorldBeginPlay ( UWorld& InWorld )	Called when world is ready to start gameplay before the game mode transitions to the correct state and call BeginPlay on all actors
void	OnWorldComponentsUpdated ( UWorld& World )	Called after world components (e.g. line batcher and all level components) have been updated
void	PostInitialize()	Called once all UWorldSubsystems have been initialized
void	UpdateStreamingState()	Updates sub-system required streaming levels (called by world's UpdateStreamingState function)

Overridden from USubsystem

		Name	Description
	bool	ShouldCreateSubsystem ( UObject* Outer )	Override to control if the Subsystem should be created at all.