In Fragments or Young Conker, You can see how the game detects and DECIDE the physical space in which you are, even without a Wi-Fi connection.
In Unity, the closest thing I've come to find is a method within "Unity/UnityHoloLens/Runtime/UnityEngine.HoloLens.dll" called SpatialMappingRenderer, which allows you to load a material to a spatial mapping, but not allows you to decide in what physical space you are or what spatial mapping you associate with it.
With the Mixed Reallity Toolkit, there is no method that allows to relate physical spaces with spatial mappings and there is nothing that allows to load spatial mappings in glasses (not in editor).
I would need to be able to save spaces and manage them.
Not that the hololens who decide where I am and that every time I update the application all the scans and anchors are lost.
Wich is the way to go?