Carga un nivel de forma aditiva.
Unlike LoadLevel, LoadLevelAdditive does not destroy objects in the current level. Objects from the new
level are added to the current Scene. This is useful for creating continuous virtual worlds, where more
content is loaded in as you walk through the environment.
LoadLevelAdditive agrega nuevos objetos en el inicio del siguiente frame en la etapa de iniciación antes de la primera llamada FixedUpdate call (see Execution Order of Event Functions).
See Also: AsyncOperation, Application.backgroundLoadingPriority, Application.LoadLevelAdditiveAsync, Application.LoadLevel, Application.LoadLevelAsync.