Add Phase 3: object spawn system with catalogue UI

Spawn System:
- SpawnableComponent: marker component for Blueprint actors (name, category, thumbnail)
- SpawnCatalog DataAsset: lists all spawnable Blueprints with Factory for easy creation
- SpawnManager: loads catalog, spawns actors in front of camera, ensures Movable mobility
- Reads metadata from Blueprint component templates (no temp spawn needed)

Catalogue UI:
- Left panel with scrollable list grouped by category
- Thumbnail cards (80x80) with name below, click to spawn
- "Capture All Thumbnails" button on DataAsset: auto-generates from UE thumbnails

Undo/Redo improvements:
- SpawnAction: undo hides spawned actor, redo shows it
- Delete confirmation dialog (Yes/No) before soft-delete
- Undo/redo auto-deselects hidden actors and refreshes gizmo
- Proper cleanup of hidden actors when actions pruned from stack

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/memory/project_ps_editor.md

@@ -8,11 +8,35 @@ PS_Editor is a runtime editor plugin for Unreal Engine 5.5 that will be integrat
 
 **Why:** Enable runtime scene editing in packaged builds - place objects, configure properties, define scenarios, manipulate splines, modify lighting, and save/load scenes as JSON.
 
-**How to apply:** All development is incremental, phase by phase. Phase 1 = GameMode + Camera (completed). Future phases: object spawning/transform, JSON serialization, splines, lighting, AI characters.
-
 Key decisions:
-- UI: UMG driven by C++ (not Blueprints)
-- Gizmos: InteractiveToolsFramework (UE5 built-in)
-- Serialization: JSON via Json/JsonUtilities modules
+- UI: UMG driven by C++ (Slate)
+- Gizmos: Custom actor with BasicShapes + unlit material (InteractiveToolsFramework is editor-only)
+- Serialization: JSON via Json/JsonUtilities modules (future)
 - Naming: PS_Editor_ prefix on all files/classes
 - Plugin path: Unreal/Plugins/PS_Editor/
+- AZERTY keyboard layout: arrows + A/Q for movement, E/R/T for modes
+
+## Completed Phases
+
+### Phase 1 - GameMode + Camera
+- PS_Editor_GameMode, PS_Editor_Pawn, PS_Editor_PlayerController, PS_Editor_HUD
+- Camera: Fly (RMB), Pan (LMB drag), Orbit (Alt+LMB / MMB)
+- Movement: arrows + A (up) / Q (down)
+
+### Phase 2 - Selection + Transform + Undo
+- SelectionManager: raycast click-to-select, Ctrl+click multi-select, Movable actors only
+- Gizmo: custom actor with colored arrows (R/G/B), cones, SDPG_Foreground, constant screen size
+- Translate/Rotate/Scale via gizmo drag, hotkeys E/R/T
+- Snap to ground (End key), soft-delete (Delete key)
+- Undo/Redo system: custom UndoManager, Ctrl+Z / Ctrl+Y, 50 action stack
+- Properties panel: editable Location/Rotation/Scale fields
+- Toolbar: mode buttons + snap ground
+- Material: M_PS_Editor_Gizmo (Unlit, Vector Parameter "Color" → Emissive, Translucent, Disable Depth Test)
+
+## Next: Phase 3 - Object Spawning
+- Catalog/list of objects to place
+- Drag & drop or click to spawn
+- Duplication of existing objects
+
+## Next: Phase 4 - JSON Serialization
+- Save/load scenes as JSON

.claude/memory/reference_build.md

@@ -12,3 +12,7 @@ Build command (Editor target, Development):
 ```
 
 **How to apply:** Use this command to compile after code changes. Timeout should be set to 600000ms (10 min) for safety. The target name is `PS_ProserveEditorEditor` (Editor suffix) for editor builds.
+
+**When to use CLI vs Live Coding:**
+- Live Coding (Ctrl+Alt+F11): .cpp only changes (no new UCLASS, USTRUCT, UENUM, UPROPERTY in headers)
+- Full CLI build (UE must be closed): new files, header changes with new reflected types, Build.cs changes

Unreal/Plugins/PS_Editor/Source/PS_Editor/GameMode/PS_Editor_Pawn.cpp

@@ -13,6 +13,7 @@
 #include "PS_Editor_Gizmo.h"
 #include "PS_Editor_UndoManager.h"
 #include "DrawDebugHelpers.h"
+#include "Misc/MessageDialog.h"
 
 APS_Editor_Pawn::APS_Editor_Pawn()
 {
@@ -573,6 +574,18 @@ void APS_Editor_Pawn::HandleDelete(const FInputActionValue& Value)
 	UPS_Editor_SelectionManager* SM = EditorPC->GetSelectionManager();
 	if (!SM || !SM->IsAnythingSelected()) return;
 
+	// Confirmation dialog
+	const int32 Count = SM->GetSelectedActors().Num();
+	const FText Message = FText::Format(
+		NSLOCTEXT("PS_Editor", "DeleteConfirm", "Delete {0} selected object(s)?"),
+		FText::AsNumber(Count));
+
+	EAppReturnType::Type Result = FMessageDialog::Open(EAppMsgType::YesNo, Message);
+	if (Result != EAppReturnType::Yes)
+	{
+		return;
+	}
+
 	// Soft-delete: hide actors instead of destroying (enables undo)
 	TSharedPtr<FPS_Editor_DeleteAction> Action = MakeShared<FPS_Editor_DeleteAction>();
 	for (const TWeakObjectPtr<AActor>& Weak : SM->GetSelectedActors())
@@ -584,14 +597,14 @@ void APS_Editor_Pawn::HandleDelete(const FInputActionValue& Value)
 	}
 
 	SM->ClearSelection();
-	Action->Execute(); // Hide the actors
+	Action->Execute();
 
 	if (UPS_Editor_UndoManager* UM = EditorPC->GetUndoManager())
 	{
 		UM->RecordAction(Action);
 	}
 
-	UE_LOG(LogTemp, Log, TEXT("PS_Editor: Soft-deleted %d actor(s)"), Action->Actors.Num());
+	UE_LOG(LogTemp, Log, TEXT("PS_Editor: Soft-deleted %d actor(s)"), Count);
 }
 
 void APS_Editor_Pawn::HandleUndo(const FInputActionValue& Value)

Unreal/Plugins/PS_Editor/Source/PS_Editor/GameMode/PS_Editor_PlayerController.cpp

@@ -1,6 +1,7 @@
 #include "PS_Editor_PlayerController.h"
 #include "PS_Editor_SelectionManager.h"
 #include "PS_Editor_UndoManager.h"
+#include "PS_Editor_SpawnManager.h"
 #include "PS_Editor_Gizmo.h"
 #include "PS_Editor_Pawn.h"
 
@@ -22,16 +23,45 @@ void APS_Editor_PlayerController::BeginPlay()
 
 	UndoManager = NewObject<UPS_Editor_UndoManager>(this);
 
-	// After undo/redo, refresh the gizmo position
+	// Load spawn catalog and create spawn manager
+	SpawnManager = NewObject<UPS_Editor_SpawnManager>(this);
+	UPS_Editor_SpawnCatalog* LoadedCatalog = SpawnCatalogAsset.LoadSynchronous();
+	SpawnManager->Initialize(this, LoadedCatalog);
+
+	// After undo/redo, deselect hidden actors and refresh gizmo
 	UndoManager->OnUndoRedo.AddWeakLambda(this, [this]()
 	{
-		if (SelectionManager && SelectionManager->IsAnythingSelected())
+		if (SelectionManager)
+		{
+			// Deselect any actors that are now hidden (undone spawn or redone delete)
+			TArray<TWeakObjectPtr<AActor>> ToDeselect;
+			for (const TWeakObjectPtr<AActor>& Weak : SelectionManager->GetSelectedActors())
+			{
+				if (AActor* Actor = Weak.Get())
+				{
+					if (Actor->IsHidden())
+					{
+						ToDeselect.Add(Actor);
+					}
+				}
+			}
+			for (const TWeakObjectPtr<AActor>& Weak : ToDeselect)
+			{
+				if (AActor* Actor = Weak.Get())
+				{
+					SelectionManager->DeselectActor(Actor);
+				}
+			}
+
+			// Refresh gizmo position
+			if (SelectionManager->IsAnythingSelected())
 			{
 				if (APS_Editor_Gizmo* Gizmo = SelectionManager->GetGizmo())
 				{
 					Gizmo->SetActorLocation(SelectionManager->GetSelectionPivot());
 				}
 			}
+		}
 	});
 }
 

Unreal/Plugins/PS_Editor/Source/PS_Editor/GameMode/PS_Editor_PlayerController.h

@@ -6,6 +6,8 @@
 
 class UPS_Editor_SelectionManager;
 class UPS_Editor_UndoManager;
+class UPS_Editor_SpawnManager;
+class UPS_Editor_SpawnCatalog;
 
 /**
  * Player controller for PS_Editor runtime editing.
@@ -25,6 +27,13 @@ public:
 	UFUNCTION(BlueprintCallable, Category = "PS Editor")
 	UPS_Editor_UndoManager* GetUndoManager() const { return UndoManager; }
 
+	UFUNCTION(BlueprintCallable, Category = "PS Editor")
+	UPS_Editor_SpawnManager* GetSpawnManager() const { return SpawnManager; }
+
+	/** The spawn catalog DataAsset to load. Set this in the Blueprint or World Settings. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "PS Editor")
+	TSoftObjectPtr<UPS_Editor_SpawnCatalog> SpawnCatalogAsset;
+
 protected:
 	virtual void BeginPlay() override;
 	virtual void OnPossess(APawn* InPawn) override;
@@ -36,5 +45,8 @@ private:
 	UPROPERTY()
 	TObjectPtr<UPS_Editor_UndoManager> UndoManager;
 
+	UPROPERTY()
+	TObjectPtr<UPS_Editor_SpawnManager> SpawnManager;
+
 	void HandleEditorClick(FVector2D ScreenPos, bool bAdditive);
 };

Unreal/Plugins/PS_Editor/Source/PS_Editor/PS_Editor.Build.cs

@@ -15,6 +15,7 @@ public class PS_Editor : ModuleRules
 		PublicIncludePaths.Add(Path.Combine(SourceDir, "UI", "Widgets"));
 		PublicIncludePaths.Add(Path.Combine(SourceDir, "Selection"));
 		PublicIncludePaths.Add(Path.Combine(SourceDir, "Gizmo"));
+		PublicIncludePaths.Add(Path.Combine(SourceDir, "Spawn"));
 
 		PublicDependencyModuleNames.AddRange(new string[]
 		{
@@ -31,5 +32,11 @@ public class PS_Editor : ModuleRules
 			"Slate",
 			"SlateCore"
 		});
+
+		// Editor-only: Factory for SpawnCatalog DataAsset creation
+		if (Target.bBuildEditor)
+		{
+			PrivateDependencyModuleNames.Add("UnrealEd");
+		}
 	}
 }

Unreal/Plugins/PS_Editor/Source/PS_Editor/Selection/PS_Editor_UndoManager.cpp

@@ -89,10 +89,23 @@ void UPS_Editor_UndoManager::PruneHistory()
 
 void UPS_Editor_UndoManager::CleanupDeleteAction(TSharedPtr<FPS_Editor_Action> Action)
 {
-	// If a delete action is being pruned from history, truly destroy the hidden actors
-	if (!Action.IsValid() || Action->ActionType != EPS_Editor_ActionType::Delete) return;
-	FPS_Editor_DeleteAction* DeleteAction = static_cast<FPS_Editor_DeleteAction*>(Action.Get());
-	for (const TWeakObjectPtr<AActor>& Weak : DeleteAction->Actors)
+	if (!Action.IsValid()) return;
+
+	// Truly destroy hidden actors when their action is pruned from history
+	TArray<TWeakObjectPtr<AActor>>* ActorsToClean = nullptr;
+
+	if (Action->ActionType == EPS_Editor_ActionType::Delete)
+	{
+		ActorsToClean = &static_cast<FPS_Editor_DeleteAction*>(Action.Get())->Actors;
+	}
+	else if (Action->ActionType == EPS_Editor_ActionType::Spawn)
+	{
+		ActorsToClean = &static_cast<FPS_Editor_SpawnAction*>(Action.Get())->Actors;
+	}
+
+	if (ActorsToClean)
+	{
+		for (const TWeakObjectPtr<AActor>& Weak : *ActorsToClean)
 		{
 			if (AActor* Actor = Weak.Get())
 			{
@@ -102,4 +115,5 @@ void UPS_Editor_UndoManager::CleanupDeleteAction(TSharedPtr<FPS_Editor_Action> A
 				}
 			}
 		}
+	}
 }

Unreal/Plugins/PS_Editor/Source/PS_Editor/Selection/PS_Editor_UndoManager.h

@@ -7,7 +7,8 @@
 enum class EPS_Editor_ActionType : uint8
 {
 	Transform,
-	Delete
+	Delete,
+	Spawn
 };
 
 /**
@@ -110,6 +111,49 @@ struct FPS_Editor_DeleteAction : public FPS_Editor_Action
 	}
 };
 
+/**
+ * Records a spawn action. Undo hides the spawned actor, redo shows it again.
+ */
+struct FPS_Editor_SpawnAction : public FPS_Editor_Action
+{
+	FPS_Editor_SpawnAction() : FPS_Editor_Action(EPS_Editor_ActionType::Spawn) {}
+
+	TArray<TWeakObjectPtr<AActor>> Actors;
+
+	virtual void Execute() override
+	{
+		// Redo: show the spawned actors
+		for (const TWeakObjectPtr<AActor>& Weak : Actors)
+		{
+			if (AActor* Actor = Weak.Get())
+			{
+				Actor->SetActorHiddenInGame(false);
+				Actor->SetActorEnableCollision(true);
+				Actor->SetActorTickEnabled(true);
+			}
+		}
+	}
+
+	virtual void Undo() override
+	{
+		// Undo spawn: hide the actors
+		for (const TWeakObjectPtr<AActor>& Weak : Actors)
+		{
+			if (AActor* Actor = Weak.Get())
+			{
+				Actor->SetActorHiddenInGame(true);
+				Actor->SetActorEnableCollision(false);
+				Actor->SetActorTickEnabled(false);
+			}
+		}
+	}
+
+	virtual FString GetDescription() const override
+	{
+		return FString::Printf(TEXT("Spawn %d actor(s)"), Actors.Num());
+	}
+};
+
 /**
  * Runtime undo/redo manager for PS_Editor.
  * Maintains a linear action stack with a cursor.

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnCatalog.cpp

@@ -0,0 +1,113 @@
+#include "PS_Editor_SpawnCatalog.h"
+
+#if WITH_EDITOR
+#include "PS_Editor_SpawnableComponent.h"
+#include "Engine/Blueprint.h"
+#include "Engine/Texture2D.h"
+#include "ThumbnailRendering/ThumbnailManager.h"
+#include "ObjectTools.h"
+#include "AssetRegistry/AssetRegistryModule.h"
+#include "UObject/SavePackage.h"
+#include "Misc/PackageName.h"
+
+void UPS_Editor_SpawnCatalog::CaptureAllThumbnails()
+{
+	int32 Captured = 0;
+
+	for (FPS_Editor_SpawnEntry& Entry : Entries)
+	{
+		UClass* LoadedClass = Entry.ActorClass.LoadSynchronous();
+		if (!LoadedClass)
+		{
+			UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Failed to load class for catalog entry"));
+			continue;
+		}
+
+		// Find the SpawnableComponent template
+		UPS_Editor_SpawnableComponent* SpawnComp = nullptr;
+		TArray<UObject*> ClassSubObjects;
+		GetObjectsWithOuter(LoadedClass, ClassSubObjects, true);
+		for (UObject* Sub : ClassSubObjects)
+		{
+			SpawnComp = Cast<UPS_Editor_SpawnableComponent>(Sub);
+			if (SpawnComp) break;
+		}
+
+		if (!SpawnComp)
+		{
+			UE_LOG(LogTemp, Warning, TEXT("PS_Editor: No SpawnableComponent on %s, skipping"), *LoadedClass->GetName());
+			continue;
+		}
+
+		// Skip if already has a custom thumbnail
+		if (SpawnComp->Thumbnail)
+		{
+			UE_LOG(LogTemp, Log, TEXT("PS_Editor: %s already has a thumbnail, skipping"), *LoadedClass->GetName());
+			continue;
+		}
+
+		// Find the Blueprint
+		UBlueprint* Blueprint = Cast<UBlueprint>(LoadedClass->ClassGeneratedBy);
+		if (!Blueprint)
+		{
+			UE_LOG(LogTemp, Warning, TEXT("PS_Editor: %s is not a Blueprint, skipping"), *LoadedClass->GetName());
+			continue;
+		}
+
+		// Generate thumbnail
+		FObjectThumbnail* ObjThumb = ThumbnailTools::GenerateThumbnailForObjectToSaveToDisk(Blueprint);
+		if (!ObjThumb || ObjThumb->GetImageWidth() <= 0 || ObjThumb->GetImageHeight() <= 0)
+		{
+			UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Failed to generate thumbnail for %s"), *Blueprint->GetName());
+			continue;
+		}
+
+		const int32 Width = ObjThumb->GetImageWidth();
+		const int32 Height = ObjThumb->GetImageHeight();
+		const TArray<uint8>& PixelData = ObjThumb->GetUncompressedImageData();
+
+		if (PixelData.Num() != Width * Height * 4)
+		{
+			continue;
+		}
+
+		// Save texture next to the Blueprint
+		FString BlueprintPath = Blueprint->GetOutermost()->GetName();
+		FString BasePath = FPaths::GetPath(BlueprintPath);
+		FString AssetName = FString::Printf(TEXT("T_%s_Thumb"), *Blueprint->GetName());
+		FString FullPath = FString::Printf(TEXT("%s/%s"), *BasePath, *AssetName);
+
+		UPackage* Package = CreatePackage(*FullPath);
+		if (!Package) continue;
+
+		UTexture2D* Texture = NewObject<UTexture2D>(Package, *AssetName, RF_Public | RF_Standalone);
+		Texture->Source.Init(Width, Height, 1, 1, TSF_BGRA8);
+
+		uint8* MipData = Texture->Source.LockMip(0);
+		FMemory::Memcpy(MipData, PixelData.GetData(), PixelData.Num());
+		Texture->Source.UnlockMip(0);
+
+		Texture->SRGB = true;
+		Texture->CompressionSettings = TC_Default;
+		Texture->MipGenSettings = TMGS_NoMipmaps;
+		Texture->PostEditChange();
+		Texture->UpdateResource();
+
+		FString PackageFilename = FPackageName::LongPackageNameToFilename(FullPath, FPackageName::GetAssetPackageExtension());
+		FSavePackageArgs SaveArgs;
+		SaveArgs.TopLevelFlags = RF_Public | RF_Standalone;
+		UPackage::SavePackage(Package, Texture, *PackageFilename, SaveArgs);
+		FAssetRegistryModule::AssetCreated(Texture);
+
+		// Assign to the component and mark Blueprint dirty
+		SpawnComp->Thumbnail = Texture;
+		Blueprint->MarkPackageDirty();
+
+		Captured++;
+		UE_LOG(LogTemp, Log, TEXT("PS_Editor: Captured thumbnail for %s -> %s"), *Blueprint->GetName(), *FullPath);
+	}
+
+	UE_LOG(LogTemp, Log, TEXT("PS_Editor: Captured %d thumbnails"), Captured);
+}
+
+#endif

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnCatalog.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Engine/DataAsset.h"
+#include "Engine/AssetManager.h"
+#include "PS_Editor_SpawnCatalog.generated.h"
+
+/**
+ * A single entry in the spawn catalogue.
+ */
+USTRUCT(BlueprintType)
+struct FPS_Editor_SpawnEntry
+{
+	GENERATED_BODY()
+
+	/** The Blueprint class to spawn. Must have a PS_Editor_SpawnableComponent for name/category. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "PS Editor")
+	TSoftClassPtr<AActor> ActorClass;
+};
+
+/**
+ * Data asset listing all Blueprints available for spawning in the PS_Editor runtime catalogue.
+ *
+ * Usage:
+ * 1. Create a DataAsset of type PS_Editor_SpawnCatalog in Content Browser
+ * 2. Add entries pointing to your prepared Blueprints
+ * 3. Click "Capture All Thumbnails" to auto-generate thumbnails
+ * 4. Reference this DataAsset in the PlayerController's SpawnCatalogAsset property
+ */
+UCLASS(BlueprintType)
+class PS_EDITOR_API UPS_Editor_SpawnCatalog : public UPrimaryDataAsset
+{
+	GENERATED_BODY()
+
+public:
+	/** List of spawnable actors. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "PS Editor")
+	TArray<FPS_Editor_SpawnEntry> Entries;
+
+#if WITH_EDITOR
+	/** Captures UE-generated thumbnails for all Blueprints in the catalog and assigns them to their SpawnableComponents. */
+	UFUNCTION(CallInEditor, Category = "PS Editor")
+	void CaptureAllThumbnails();
+#endif
+};

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnCatalogFactory.cpp

@@ -0,0 +1,27 @@
+#if WITH_EDITOR
+
+#include "PS_Editor_SpawnCatalogFactory.h"
+#include "PS_Editor_SpawnCatalog.h"
+
+#define LOCTEXT_NAMESPACE "PS_Editor"
+
+UPS_Editor_SpawnCatalogFactory::UPS_Editor_SpawnCatalogFactory()
+{
+	SupportedClass = UPS_Editor_SpawnCatalog::StaticClass();
+	bCreateNew = true;
+	bEditAfterNew = true;
+}
+
+UObject* UPS_Editor_SpawnCatalogFactory::FactoryCreateNew(UClass* InClass, UObject* InParent, FName InName, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn)
+{
+	return NewObject<UPS_Editor_SpawnCatalog>(InParent, InClass, InName, Flags);
+}
+
+FText UPS_Editor_SpawnCatalogFactory::GetDisplayName() const
+{
+	return LOCTEXT("SpawnCatalogDisplayName", "PS Editor Spawn Catalog");
+}
+
+#undef LOCTEXT_NAMESPACE
+
+#endif

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnCatalogFactory.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#if WITH_EDITOR
+
+#include "CoreMinimal.h"
+#include "Factories/Factory.h"
+#include "PS_Editor_SpawnCatalogFactory.generated.h"
+
+UCLASS(HideCategories = Object)
+class UPS_Editor_SpawnCatalogFactory : public UFactory
+{
+	GENERATED_BODY()
+
+public:
+	UPS_Editor_SpawnCatalogFactory();
+
+	virtual UObject* FactoryCreateNew(UClass* InClass, UObject* InParent, FName InName, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn) override;
+	virtual bool ShouldShowInNewMenu() const override { return true; }
+	virtual FText GetDisplayName() const override;
+};
+
+#endif

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnManager.cpp

@@ -0,0 +1,170 @@
+#include "PS_Editor_SpawnManager.h"
+#include "PS_Editor_SpawnableComponent.h"
+#include "PS_Editor_UndoManager.h"
+#include "PS_Editor_PlayerController.h"
+#include "GameFramework/PlayerController.h"
+#include "Engine/World.h"
+
+void UPS_Editor_SpawnManager::Initialize(APlayerController* InOwnerPC, UPS_Editor_SpawnCatalog* InCatalog)
+{
+	OwnerPC = InOwnerPC;
+	Catalog = InCatalog;
+
+	if (Catalog)
+	{
+		ResolveCatalog();
+		UE_LOG(LogTemp, Log, TEXT("PS_Editor: SpawnCatalog loaded with %d entries"), ResolvedEntries.Num());
+	}
+	else
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: No SpawnCatalog assigned. Spawn catalogue will be empty."));
+	}
+}
+
+void UPS_Editor_SpawnManager::ResolveCatalog()
+{
+	ResolvedEntries.Empty();
+
+	if (!Catalog)
+	{
+		return;
+	}
+
+	for (const FPS_Editor_SpawnEntry& Entry : Catalog->Entries)
+	{
+		// Synchronously load the class
+		UClass* LoadedClass = Entry.ActorClass.LoadSynchronous();
+		if (!LoadedClass)
+		{
+			UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Failed to load class for catalog entry"));
+			continue;
+		}
+
+		FPS_Editor_ResolvedEntry Resolved;
+		Resolved.ActorClass = LoadedClass;
+
+		// Find the SpawnableComponent template in the Blueprint class hierarchy.
+		// Blueprint-added components are stored as subobjects of the UBlueprintGeneratedClass.
+		UPS_Editor_SpawnableComponent* SpawnComp = nullptr;
+
+		// Search BPGC subobjects (Blueprint-added components)
+		TArray<UObject*> ClassSubObjects;
+		GetObjectsWithOuter(LoadedClass, ClassSubObjects, true);
+		for (UObject* Sub : ClassSubObjects)
+		{
+			SpawnComp = Cast<UPS_Editor_SpawnableComponent>(Sub);
+			if (SpawnComp)
+			{
+				break;
+			}
+		}
+
+		// Fallback: check CDO subobjects (C++ constructor components)
+		if (!SpawnComp)
+		{
+			AActor* CDO = LoadedClass->GetDefaultObject<AActor>();
+			if (CDO)
+			{
+				SpawnComp = CDO->FindComponentByClass<UPS_Editor_SpawnableComponent>();
+			}
+		}
+
+		if (SpawnComp && !SpawnComp->DisplayName.IsEmpty())
+		{
+			Resolved.DisplayName = SpawnComp->DisplayName;
+		}
+		else
+		{
+			Resolved.DisplayName = LoadedClass->GetName();
+			Resolved.DisplayName.RemoveFromEnd(TEXT("_C"));
+		}
+
+		Resolved.Category = SpawnComp ? SpawnComp->Category : TEXT("Default");
+		Resolved.Thumbnail = SpawnComp ? SpawnComp->Thumbnail : nullptr;
+
+		ResolvedEntries.Add(Resolved);
+	}
+}
+
+AActor* UPS_Editor_SpawnManager::SpawnFromCatalog(int32 Index)
+{
+	return SpawnFromCatalogAtLocation(Index, ComputeSpawnLocation());
+}
+
+AActor* UPS_Editor_SpawnManager::SpawnFromCatalogAtLocation(int32 Index, FVector WorldLocation)
+{
+	if (!ResolvedEntries.IsValidIndex(Index))
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Invalid catalog index %d"), Index);
+		return nullptr;
+	}
+
+	APlayerController* PC = OwnerPC.Get();
+	if (!PC || !PC->GetWorld())
+	{
+		return nullptr;
+	}
+
+	const FPS_Editor_ResolvedEntry& Entry = ResolvedEntries[Index];
+	if (!Entry.ActorClass)
+	{
+		return nullptr;
+	}
+
+	FActorSpawnParameters SpawnParams;
+	SpawnParams.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AdjustIfPossibleButAlwaysSpawn;
+
+	AActor* SpawnedActor = PC->GetWorld()->SpawnActor<AActor>(Entry.ActorClass, WorldLocation, FRotator::ZeroRotator, SpawnParams);
+	if (!SpawnedActor)
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Failed to spawn %s"), *Entry.DisplayName);
+		return nullptr;
+	}
+
+	// Ensure the spawned actor is Movable (so it's selectable)
+	if (USceneComponent* Root = SpawnedActor->GetRootComponent())
+	{
+		Root->SetMobility(EComponentMobility::Movable);
+	}
+
+	// Record undo action (undo = hide the spawned actor)
+	if (APS_Editor_PlayerController* EditorPC = Cast<APS_Editor_PlayerController>(PC))
+	{
+		if (UPS_Editor_UndoManager* UM = EditorPC->GetUndoManager())
+		{
+			TSharedPtr<FPS_Editor_SpawnAction> Action = MakeShared<FPS_Editor_SpawnAction>();
+			Action->Actors.Add(SpawnedActor);
+			UM->RecordAction(Action);
+		}
+	}
+
+	UE_LOG(LogTemp, Log, TEXT("PS_Editor: Spawned %s at %s"), *Entry.DisplayName, *WorldLocation.ToString());
+	return SpawnedActor;
+}
+
+FVector UPS_Editor_SpawnManager::ComputeSpawnLocation() const
+{
+	APlayerController* PC = OwnerPC.Get();
+	if (!PC)
+	{
+		return FVector::ZeroVector;
+	}
+
+	FVector CameraLocation;
+	FRotator CameraRotation;
+	PC->GetPlayerViewPoint(CameraLocation, CameraRotation);
+
+	// Spawn 500 units in front of the camera
+	return CameraLocation + CameraRotation.Vector() * 500.0f;
+}
+
+TArray<FString> UPS_Editor_SpawnManager::GetCategories() const
+{
+	TArray<FString> Categories;
+	for (const FPS_Editor_ResolvedEntry& Entry : ResolvedEntries)
+	{
+		Categories.AddUnique(Entry.Category);
+	}
+	Categories.Sort();
+	return Categories;
+}

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnManager.h

@@ -0,0 +1,69 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "UObject/NoExportTypes.h"
+#include "PS_Editor_SpawnCatalog.h"
+#include "PS_Editor_SpawnManager.generated.h"
+
+class APlayerController;
+class UPS_Editor_UndoManager;
+
+/**
+ * Resolved catalog entry with display info ready for UI.
+ */
+USTRUCT()
+struct FPS_Editor_ResolvedEntry
+{
+	GENERATED_BODY()
+
+	UPROPERTY()
+	TSubclassOf<AActor> ActorClass;
+
+	FString DisplayName;
+	FString Category;
+
+	UPROPERTY()
+	TObjectPtr<UTexture2D> Thumbnail;
+};
+
+/**
+ * Manages spawning of prepared Blueprint actors at runtime.
+ * Loads a SpawnCatalog DataAsset and provides spawn functions.
+ */
+UCLASS()
+class PS_EDITOR_API UPS_Editor_SpawnManager : public UObject
+{
+	GENERATED_BODY()
+
+public:
+	/** Initialize with owning controller and load catalog. */
+	void Initialize(APlayerController* InOwnerPC, UPS_Editor_SpawnCatalog* InCatalog);
+
+	/** Spawn the actor at the given catalog index, positioned in front of the camera. Returns the spawned actor. */
+	AActor* SpawnFromCatalog(int32 Index);
+
+	/** Spawn the actor at a specific world location. */
+	AActor* SpawnFromCatalogAtLocation(int32 Index, FVector WorldLocation);
+
+	/** Get the resolved catalog entries for UI display. */
+	const TArray<FPS_Editor_ResolvedEntry>& GetResolvedEntries() const { return ResolvedEntries; }
+
+	/** Get unique categories for filtering. */
+	TArray<FString> GetCategories() const;
+
+private:
+	UPROPERTY()
+	TWeakObjectPtr<APlayerController> OwnerPC;
+
+	UPROPERTY()
+	TObjectPtr<UPS_Editor_SpawnCatalog> Catalog;
+
+	UPROPERTY()
+	TArray<FPS_Editor_ResolvedEntry> ResolvedEntries;
+
+	/** Resolve all catalog entries (load classes, read SpawnableComponent metadata). */
+	void ResolveCatalog();
+
+	/** Compute spawn location in front of the camera. */
+	FVector ComputeSpawnLocation() const;
+};

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnableComponent.cpp

@@ -0,0 +1,6 @@
+#include "PS_Editor_SpawnableComponent.h"
+
+UPS_Editor_SpawnableComponent::UPS_Editor_SpawnableComponent()
+{
+	PrimaryComponentTick.bCanEverTick = false;
+}

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnableComponent.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Components/ActorComponent.h"
+#include "PS_Editor_SpawnableComponent.generated.h"
+
+/**
+ * Marker component for Blueprints that can be spawned via the PS_Editor catalogue.
+ * Add this component to any Blueprint to make it appear in the runtime spawn catalogue.
+ */
+UCLASS(ClassGroup = (PSEditor), meta = (BlueprintSpawnableComponent, DisplayName = "PS Editor Spawnable"))
+class PS_EDITOR_API UPS_Editor_SpawnableComponent : public UActorComponent
+{
+	GENERATED_BODY()
+
+public:
+	UPS_Editor_SpawnableComponent();
+
+	/** Display name shown in the spawn catalogue UI. If empty, uses the actor's class name. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Spawnable")
+	FString DisplayName;
+
+	/** Category for filtering in the catalogue (e.g. "Characters", "Props", "Vehicles"). */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Spawnable")
+	FString Category = TEXT("Default");
+
+	/** Optional thumbnail texture shown in the catalogue. Use "Capture All Thumbnails" on the SpawnCatalog DataAsset to auto-generate. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Spawnable")
+	TObjectPtr<UTexture2D> Thumbnail;
+};

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnableComponentCustomization.cpp

@@ -0,0 +1,139 @@
+#if WITH_EDITOR
+
+#include "PS_Editor_SpawnableComponentCustomization.h"
+#include "PS_Editor_SpawnableComponent.h"
+#include "DetailLayoutBuilder.h"
+#include "DetailCategoryBuilder.h"
+#include "DetailWidgetRow.h"
+#include "Widgets/Input/SButton.h"
+#include "Widgets/Text/STextBlock.h"
+#include "Engine/Blueprint.h"
+#include "Engine/Texture2D.h"
+#include "ThumbnailRendering/ThumbnailManager.h"
+#include "ObjectTools.h"
+#include "AssetRegistry/AssetRegistryModule.h"
+#include "UObject/SavePackage.h"
+#include "Misc/PackageName.h"
+#include "HAL/FileManager.h"
+
+TSharedRef<IDetailCustomization> FPS_Editor_SpawnableComponentCustomization::MakeInstance()
+{
+	return MakeShareable(new FPS_Editor_SpawnableComponentCustomization);
+}
+
+void FPS_Editor_SpawnableComponentCustomization::CustomizeDetails(IDetailLayoutBuilder& DetailBuilder)
+{
+	TArray<TWeakObjectPtr<UObject>> Objects;
+	DetailBuilder.GetObjectsBeingCustomized(Objects);
+	if (Objects.Num() > 0)
+	{
+		EditedComponent = Objects[0];
+	}
+
+	IDetailCategoryBuilder& Category = DetailBuilder.EditCategory("PS Editor|Spawnable");
+	Category.AddCustomRow(FText::FromString(TEXT("Capture Thumbnail")))
+	.NameContent()
+	[
+		SNew(STextBlock)
+		.Text(FText::FromString(TEXT("Auto Thumbnail")))
+		.Font(IDetailLayoutBuilder::GetDetailFont())
+	]
+	.ValueContent()
+	.MinDesiredWidth(150.0f)
+	[
+		SNew(SButton)
+		.HAlign(HAlign_Center)
+		.OnClicked(FOnClicked::CreateRaw(this, &FPS_Editor_SpawnableComponentCustomization::OnCaptureThumbnailClicked))
+		[
+			SNew(STextBlock)
+			.Text(FText::FromString(TEXT("Capture Thumbnail")))
+			.Font(IDetailLayoutBuilder::GetDetailFont())
+		]
+	];
+}
+
+FReply FPS_Editor_SpawnableComponentCustomization::OnCaptureThumbnailClicked()
+{
+	UPS_Editor_SpawnableComponent* Comp = Cast<UPS_Editor_SpawnableComponent>(EditedComponent.Get());
+	if (!Comp)
+	{
+		return FReply::Handled();
+	}
+
+	// Find the owning Blueprint
+	AActor* OwnerActor = Comp->GetOwner();
+	if (!OwnerActor)
+	{
+		return FReply::Handled();
+	}
+
+	UClass* ActorClass = OwnerActor->GetClass();
+	UBlueprint* Blueprint = Cast<UBlueprint>(ActorClass->ClassGeneratedBy);
+	if (!Blueprint)
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Cannot capture thumbnail - not a Blueprint actor"));
+		return FReply::Handled();
+	}
+
+	// Generate thumbnail
+	FObjectThumbnail* ObjThumb = ThumbnailTools::GenerateThumbnailForObjectToSaveToDisk(Blueprint);
+	if (!ObjThumb || ObjThumb->GetImageWidth() <= 0 || ObjThumb->GetImageHeight() <= 0)
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Failed to generate thumbnail for %s"), *Blueprint->GetName());
+		return FReply::Handled();
+	}
+
+	const int32 Width = ObjThumb->GetImageWidth();
+	const int32 Height = ObjThumb->GetImageHeight();
+	const TArray<uint8>& PixelData = ObjThumb->GetUncompressedImageData();
+
+	if (PixelData.Num() != Width * Height * 4)
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Invalid thumbnail pixel data"));
+		return FReply::Handled();
+	}
+
+	// Save as a persistent texture asset next to the Blueprint
+	FString BlueprintPath = Blueprint->GetOutermost()->GetName();
+	FString BasePath = FPaths::GetPath(BlueprintPath);
+	FString AssetName = FString::Printf(TEXT("T_%s_Thumb"), *Blueprint->GetName());
+	FString FullPath = FString::Printf(TEXT("%s/%s"), *BasePath, *AssetName);
+
+	UPackage* Package = CreatePackage(*FullPath);
+	if (!Package)
+	{
+		UE_LOG(LogTemp, Warning, TEXT("PS_Editor: Failed to create package for thumbnail"));
+		return FReply::Handled();
+	}
+
+	UTexture2D* Texture = NewObject<UTexture2D>(Package, *AssetName, RF_Public | RF_Standalone);
+	Texture->Source.Init(Width, Height, 1, 1, TSF_BGRA8);
+
+	uint8* MipData = Texture->Source.LockMip(0);
+	FMemory::Memcpy(MipData, PixelData.GetData(), PixelData.Num());
+	Texture->Source.UnlockMip(0);
+
+	Texture->SRGB = true;
+	Texture->CompressionSettings = TC_Default;
+	Texture->MipGenSettings = TMGS_NoMipmaps;
+	Texture->PostEditChange();
+	Texture->UpdateResource();
+
+	// Save the package
+	FString PackageFilename = FPackageName::LongPackageNameToFilename(FullPath, FPackageName::GetAssetPackageExtension());
+	FSavePackageArgs SaveArgs;
+	SaveArgs.TopLevelFlags = RF_Public | RF_Standalone;
+	UPackage::SavePackage(Package, Texture, *PackageFilename, SaveArgs);
+
+	FAssetRegistryModule::AssetCreated(Texture);
+
+	// Assign to the component
+	Comp->Thumbnail = Texture;
+	Comp->MarkPackageDirty();
+
+	UE_LOG(LogTemp, Log, TEXT("PS_Editor: Thumbnail captured and saved to %s"), *FullPath);
+
+	return FReply::Handled();
+}
+
+#endif

Unreal/Plugins/PS_Editor/Source/PS_Editor/Spawn/PS_Editor_SpawnableComponentCustomization.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#if WITH_EDITOR
+
+#include "CoreMinimal.h"
+#include "IDetailCustomization.h"
+
+/**
+ * Detail panel customization for UPS_Editor_SpawnableComponent.
+ * Adds a "Capture Thumbnail" button that grabs the Blueprint's auto-generated
+ * thumbnail and saves it as a persistent UTexture2D asset.
+ */
+class FPS_Editor_SpawnableComponentCustomization : public IDetailCustomization
+{
+public:
+	static TSharedRef<IDetailCustomization> MakeInstance();
+
+	virtual void CustomizeDetails(IDetailLayoutBuilder& DetailBuilder) override;
+
+private:
+	FReply OnCaptureThumbnailClicked();
+
+	TWeakObjectPtr<UObject> EditedComponent;
+};
+
+#endif

Unreal/Plugins/PS_Editor/Source/PS_Editor/UI/PS_Editor_HUD.cpp

@@ -17,6 +17,7 @@ void APS_Editor_HUD::BeginPlay()
 			if (APS_Editor_PlayerController* EditorPC = Cast<APS_Editor_PlayerController>(PC))
 			{
 				MainWidget->SetSelectionManager(EditorPC->GetSelectionManager());
+				MainWidget->SetSpawnManager(EditorPC->GetSpawnManager());
 			}
 
 			MainWidget->AddToViewport(0);

Unreal/Plugins/PS_Editor/Source/PS_Editor/UI/Widgets/PS_Editor_MainWidget.cpp

@@ -1,5 +1,6 @@
 #include "PS_Editor_MainWidget.h"
 #include "PS_Editor_SelectionManager.h"
+#include "PS_Editor_SpawnManager.h"
 #include "PS_Editor_UndoManager.h"
 #include "PS_Editor_PlayerController.h"
 #include "Widgets/SBoxPanel.h"
@@ -7,6 +8,8 @@
 #include "Widgets/Layout/SBorder.h"
 #include "Widgets/Layout/SScrollBox.h"
 #include "Widgets/Input/SButton.h"
+#include "Widgets/Images/SImage.h"
+#include "Engine/Texture2D.h"
 #include "Widgets/Input/SEditableTextBox.h"
 #include "Widgets/SOverlay.h"
 
@@ -15,6 +18,11 @@ void UPS_Editor_MainWidget::SetSelectionManager(UPS_Editor_SelectionManager* InS
 	SelectionManager = InSelectionManager;
 }
 
+void UPS_Editor_MainWidget::SetSpawnManager(UPS_Editor_SpawnManager* InSpawnManager)
+{
+	SpawnManager = InSpawnManager;
+}
+
 TSharedRef<SWidget> UPS_Editor_MainWidget::RebuildWidget()
 {
 	return SNew(SOverlay)
@@ -63,6 +71,14 @@ TSharedRef<SWidget> UPS_Editor_MainWidget::RebuildWidget()
 				BuildToolbar()
 			]
 		]
+		// Left panel: Spawn Catalogue
+		+ SOverlay::Slot()
+		.HAlign(HAlign_Left)
+		.VAlign(VAlign_Center)
+		.Padding(16.0f, 80.0f, 0.0f, 60.0f)
+		[
+			BuildSpawnCatalog()
+		]
 		// Right panel: Properties
 		+ SOverlay::Slot()
 		.HAlign(HAlign_Right)
@@ -242,9 +258,175 @@ TSharedRef<SWidget> UPS_Editor_MainWidget::BuildPropertiesPanel()
 		];
 }
 
+TSharedRef<SWidget> UPS_Editor_MainWidget::BuildSpawnCatalog()
+{
+	TSharedRef<SVerticalBox> CatalogList = SNew(SVerticalBox);
+
+	// Header
+	CatalogList->AddSlot()
+	.AutoHeight()
+	.Padding(0.0f, 0.0f, 0.0f, 4.0f)
+	[
+		SNew(STextBlock)
+		.Text(FText::FromString(TEXT("Spawn Catalogue")))
+		.Font(FCoreStyle::GetDefaultFontStyle("Bold", 11))
+		.ColorAndOpacity(FLinearColor(0.8f, 0.8f, 0.8f))
+	];
+
+	// Note: entries will be populated in NativeConstruct when SpawnManager is set.
+	// For now, show a placeholder. The actual list is built dynamically.
+	CatalogList->AddSlot()
+	.AutoHeight()
+	[
+		SAssignNew(SpawnListContainer, SVerticalBox)
+	];
+
+	return SNew(SBorder)
+		.BorderBackgroundColor(FLinearColor(0.05f, 0.05f, 0.05f, 0.85f))
+		.Padding(FMargin(10.0f, 8.0f))
+		[
+			SNew(SBox)
+			.MinDesiredWidth(180.0f)
+			.MaxDesiredHeight(400.0f)
+			[
+				SNew(SScrollBox)
+				+ SScrollBox::Slot()
+				[
+					CatalogList
+				]
+			]
+		];
+}
+
 void UPS_Editor_MainWidget::NativeConstruct()
 {
 	Super::NativeConstruct();
+	PopulateSpawnCatalog();
+}
+
+void UPS_Editor_MainWidget::PopulateSpawnCatalog()
+{
+	if (!SpawnListContainer.IsValid())
+	{
+		return;
+	}
+
+	SpawnListContainer->ClearChildren();
+
+	UPS_Editor_SpawnManager* SM = SpawnManager.Get();
+	if (!SM)
+	{
+		SpawnListContainer->AddSlot()
+		.AutoHeight()
+		[
+			SNew(STextBlock)
+			.Text(FText::FromString(TEXT("No catalog loaded")))
+			.Font(FCoreStyle::GetDefaultFontStyle("Italic", 9))
+			.ColorAndOpacity(FLinearColor(0.5f, 0.5f, 0.5f))
+		];
+		return;
+	}
+
+	const TArray<FPS_Editor_ResolvedEntry>& Entries = SM->GetResolvedEntries();
+	if (Entries.Num() == 0)
+	{
+		SpawnListContainer->AddSlot()
+		.AutoHeight()
+		[
+			SNew(STextBlock)
+			.Text(FText::FromString(TEXT("Catalog is empty")))
+			.Font(FCoreStyle::GetDefaultFontStyle("Italic", 9))
+			.ColorAndOpacity(FLinearColor(0.5f, 0.5f, 0.5f))
+		];
+		return;
+	}
+
+	// Group by category
+	FString CurrentCategory;
+	for (int32 i = 0; i < Entries.Num(); ++i)
+	{
+		const FPS_Editor_ResolvedEntry& Entry = Entries[i];
+
+		// Category header
+		if (Entry.Category != CurrentCategory)
+		{
+			CurrentCategory = Entry.Category;
+			SpawnListContainer->AddSlot()
+			.AutoHeight()
+			.Padding(0.0f, 6.0f, 0.0f, 2.0f)
+			[
+				SNew(STextBlock)
+				.Text(FText::FromString(CurrentCategory))
+				.Font(FCoreStyle::GetDefaultFontStyle("Bold", 9))
+				.ColorAndOpacity(FLinearColor(0.6f, 0.6f, 0.6f))
+			];
+		}
+
+		// Spawn card: thumbnail on top, name below
+		const int32 EntryIndex = i;
+		const float CardSize = 80.0f;
+
+		TSharedRef<SVerticalBox> CardContent = SNew(SVerticalBox);
+
+		// Thumbnail
+		if (Entry.Thumbnail)
+		{
+			TSharedPtr<FSlateBrush> Brush = MakeShared<FSlateBrush>();
+			Brush->SetResourceObject(Entry.Thumbnail);
+			Brush->ImageSize = FVector2D(CardSize, CardSize);
+			Brush->DrawAs = ESlateBrushDrawType::Image;
+			Brush->Tiling = ESlateBrushTileType::NoTile;
+			CachedBrushes.Add(Brush);
+
+			TWeakPtr<FSlateBrush> WeakBrush = Brush;
+			CardContent->AddSlot()
+			.AutoHeight()
+			.HAlign(HAlign_Center)
+			[
+				SNew(SImage)
+				.Image_Lambda([WeakBrush]() -> const FSlateBrush*
+				{
+					return WeakBrush.IsValid() ? WeakBrush.Pin().Get() : nullptr;
+				})
+				.DesiredSizeOverride(FVector2D(CardSize, CardSize))
+			];
+		}
+
+		// Name below thumbnail
+		CardContent->AddSlot()
+		.AutoHeight()
+		.HAlign(HAlign_Center)
+		.Padding(0.0f, 4.0f, 0.0f, 0.0f)
+		[
+			SNew(STextBlock)
+			.Text(FText::FromString(Entry.DisplayName))
+			.Font(FCoreStyle::GetDefaultFontStyle("Regular", 9))
+			.Justification(ETextJustify::Center)
+			.ColorAndOpacity(FLinearColor::White)
+		];
+
+		SpawnListContainer->AddSlot()
+		.AutoHeight()
+		.Padding(4.0f, 4.0f)
+		[
+			SNew(SButton)
+			.OnClicked_Lambda([this, EntryIndex]() -> FReply
+			{
+				if (UPS_Editor_SpawnManager* Mgr = SpawnManager.Get())
+				{
+					Mgr->SpawnFromCatalog(EntryIndex);
+				}
+				return FReply::Handled();
+			})
+			[
+				SNew(SBox)
+				.MinDesiredWidth(CardSize + 8.0f)
+				[
+					CardContent
+				]
+			]
+		];
+	}
 }
 
 void UPS_Editor_MainWidget::NativeTick(const FGeometry& MyGeometry, float InDeltaTime)

Unreal/Plugins/PS_Editor/Source/PS_Editor/UI/Widgets/PS_Editor_MainWidget.h

@@ -6,6 +6,7 @@
 #include "PS_Editor_MainWidget.generated.h"
 
 class UPS_Editor_SelectionManager;
+class UPS_Editor_SpawnManager;
 
 /**
  * Main editor widget for PS_Editor.
@@ -18,8 +19,9 @@ class PS_EDITOR_API UPS_Editor_MainWidget : public UUserWidget
 	GENERATED_BODY()
 
 public:
-	/** Set the selection manager reference. Must be called after construction. */
+	/** Set manager references. Must be called after construction. */
 	void SetSelectionManager(UPS_Editor_SelectionManager* InSelectionManager);
+	void SetSpawnManager(UPS_Editor_SpawnManager* InSpawnManager);
 
 protected:
 	virtual TSharedRef<SWidget> RebuildWidget() override;
@@ -30,10 +32,17 @@ private:
 	UPROPERTY()
 	TWeakObjectPtr<UPS_Editor_SelectionManager> SelectionManager;
 
+	UPROPERTY()
+	TWeakObjectPtr<UPS_Editor_SpawnManager> SpawnManager;
+
 	// ---- Slate widget refs for dynamic updates ----
 	TSharedPtr<STextBlock> ModeText;
 	TSharedPtr<STextBlock> SelectionInfoText;
 
+	// Spawn catalog
+	TSharedPtr<SVerticalBox> SpawnListContainer;
+	TArray<TSharedPtr<FSlateBrush>> CachedBrushes;
+
 	// Transform fields
 	TSharedPtr<SEditableTextBox> LocX, LocY, LocZ;
 	TSharedPtr<SEditableTextBox> RotX, RotY, RotZ;
@@ -42,6 +51,8 @@ private:
 	// ---- Helpers ----
 	TSharedRef<SWidget> BuildToolbar();
 	TSharedRef<SWidget> BuildPropertiesPanel();
+	TSharedRef<SWidget> BuildSpawnCatalog();
+	void PopulateSpawnCatalog();
 	void RefreshPropertiesFromSelection();
 	void ApplyTransformFromUI();
 	FString FloatToString(float Value) const;