GlobalDungeonObject.cs

using UnityEngine;

class GlobalDungeonObject : MonoBehaviour
{
}

UnparentGlobalDungeonObjects.cs

using DunGen;
using UnityEngine;

/// <summary>
/// Takes objects marked as global dungeon objects (can move freely throughout the dungeon layout)
/// and parents them to the dungeon root instead of the room the object was spawned in.
/// Used to prevent global objects from being culled when using the built-in culling scripts
/// NOTE: Script execution order might need to be changed to ensure this script runs before the culling
///       caches all of the renderers in each tile.
/// </summary>
class UnparentGlobalDungeonObjects : MonoBehaviour
{
	public RuntimeDungeon RuntimeDungeon = null;


	private void Awake()
	{
		RuntimeDungeon.Generator.OnGenerationStatusChanged += OnGenerationStatusChanged;
	}

	private void OnDestroy()
	{
		RuntimeDungeon.Generator.OnGenerationStatusChanged -= OnGenerationStatusChanged;
	}

	private void OnGenerationStatusChanged(DungeonGenerator generator, GenerationStatus status)
	{
		if (status != GenerationStatus.Complete)
			return;

		// GlobalDungeonObject is just an empty MonoBehaviour used to tag objects
		// other methods can be used instead (tags, name, layer, etc)
		foreach (var obj in generator.Root.GetComponentsInChildren<GlobalDungeonObject>())
			obj.transform.parent = generator.Root.transform;
	}
}