Saving a Room Scan

Unity Engine
1

Hey,
(editing my post to explain my query better)

Currently I have made an application that scans my room and then places an initial object on a wall after which the whole experience works around that initial object.
I want to be able to save the spatial mapping/ understanding i just did so that the next time when the application starts the Headset remembers the room setup and there is no need to scan the room again. I read something about world anchors, but im not sure how to go about this.
I’m a newbie at HoloLens, will love all the help i can get, Thanks.

2

I followed this tutorial to learn about world anchors myself
https://mtaulty.com/2016/12/20/hitchhiking-the-holotoolkity-unity-leg-5-baby-steps-with-world-anchors-and-persisting-holograms/

Along with this thread to further my own use: