First, we'll build the art gallery's room structure by performing the following steps:
- Create a floor plane by navigating to GameObject | 3D Object | Plane. Reset its Transform option and rename it to Floor.
- Create the material for the floor and color it brown. Create | Material, rename it, set its Albedo (70, 25, 5), and drag the material onto the Floor.
- Our room is sized 24 by 36 feet, which in meters is roughly 7.3 by 11. A Unity plane is 10 units square. So, Scale it to (0.73, 2, 1.1).
- Import the gallery model (for instance, Gallery.blend). Drag a copy from Project Assets into the Scene. Reset its Transform option.
- Manually rotate and/or scale it to fit the floor, as needed (mine fits, but its Rotate Y value needed ...