State Machines

v1.0
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Introduction

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 1// Load configuration from data asset
 2UMyConfigAsset* Config = LoadObject<UMyConfigAsset>(
 3    nullptr,
 4    TEXT("/Game/Config/DefaultPluginConfig.DefaultPluginConfig")
 5);
 6
 7if (Config)
 8{
 9    Settings.MaxPoolSize = Config->MaxPoolSize;
10    Settings.TickRate = Config->TickRate;
11    Settings.bEnableDebugDraw = Config->bEnableDebugDraw;
12    Settings.LogVerbosity = Config->LogVerbosity;
13
14    UE_LOG(LogCorePhysicsEdge, Log, TEXT("Configuration loaded: PoolSize=%d, TickRate=%.2f"),
15        Settings.MaxPoolSize, Settings.TickRate);
16}

Troubleshooting

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  • Initialize: Call once during BeginPlay to set up internal state
  • Configure: Pass a configuration struct or Data Asset reference
  • Activate: Enable the component to begin processing
  • Query: Perform spatial or logical queries against the managed data
  • Deactivate: Temporarily stop processing without losing state
  • Teardown: Clean up resources during EndPlay

Workflow

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 1# Plugin configuration (CorePhysicsEdge.yaml)
 2plugin:
 3  name: CorePhysicsEdge
 4  version: 2.0
 5  settings:
 6    max_pool_size: 100
 7    tick_rate: 60.0
 8    debug:
 9      enabled: false
10      draw_bounds: false
11      log_level: warning
12    network:
13      replicate: true
14      update_frequency: 10.0

Common Patterns

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 1// Declare delegates for event-driven communication
 2DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnStateChanged, EMyState, NewState);
 3DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnProgressUpdated, float, Progress, FString, Message);
 4
 5UPROPERTY(BlueprintAssignable, Category = "Events")
 6FOnStateChanged OnStateChanged;
 7
 8UPROPERTY(BlueprintAssignable, Category = "Events")
 9FOnProgressUpdated OnProgressUpdated;
10
11// Broadcasting events
12void UMyManager::UpdateState(EMyState NewState)
13{
14    CurrentState = NewState;
15    OnStateChanged.Broadcast(NewState);
16    OnProgressUpdated.Broadcast(GetProgress(), GetStatusMessage());
17}

Setup

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Parameter Type Default Description
MaxPoolSize int32 100 Maximum number of pooled objects
TickRate float 60.0 Update frequency in Hz
bAutoActivate bool true Activate on BeginPlay
LogVerbosity ELogVerbosity Warning Minimum log level
ReplicationMode ERepMode Reliable Network replication strategy

Troubleshooting

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Material Setup Screenshot
Material Setup Screenshot

Introduction

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Note: This feature is available starting from version 2.0. Older versions use a different API.