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Unreal Engine C++ API Reference > Editor > UnrealEd > TClassInstanceThumbnailScene
Syntax
TMap< FName, TSharedPtr< ThumbnailSceneType > > InstancedThumbnailScenes
Remarks
Mapping between the class type and its thumbnail scene.
This uses the class name rather than the class pointer to avoid leaving behind stale class instances as Blueprints are re-compiled.