What method is used to load new scenes in Unity?

The method for loading new scenes in Unity is SceneManager.LoadScene(). This function is part of the UnityEngine.SceneManagement namespace and is the standard way to manage and switch between different scenes in a Unity project. It allows developers to specify the name or index of the scene they wish to load, enabling both forward and backward navigation through scenes in a game.

This approach is preferred because it integrates with Unity's scene management system and provides more robust features compared to other methods. It supports asynchronous operation, which is useful for performance optimization, allowing loading scenes in the background while keeping the current scene interactive.

In contrast, other methods mentioned are either outdated or part of custom implementations. For instance, Application.LoadLevel() was used in earlier versions of Unity but has since been deprecated in favor of the SceneManager class. Similarly, SceneController.SwitchScene() and LevelManager.LoadNewScene() suggest a user-defined or custom class handling scene management, which may not be universally applicable or best practice across Unity projects. Therefore, using SceneManager.LoadScene() is the recommended and most effective way to load scenes in Unity.