1. Upload a 2D photo of a room (with/or without floors cropped out)
2. Position a 3D rending of the floors (as done in reference application named above)
3. Superimpose the positioned floors unto the 2D photo of the room by filling up the cropped floor area with the 3D positioned floors.
This is just a POC, but we expect this to work. You will need to provide a way for the POC to collect the 3D floor.