Technical Highlights

Window placement: The user marks the window corners with hand tracking. The World Query API and plane detection snap each corner onto the real surface, so the window fits the wall or window exactly.
Portal occlusion: Occluder materials hide the 3D scenery everywhere except inside the window frame, which makes the scenery look like it is behind the wall.
Persistence: Spatial Persistence saves the window’s position in the room, so it is still there the next time the user opens the app.
Interaction: The Spectacles Interaction Kit handles hand input for placement and for the scene-switching panel.