OpenPetCam blog https://openpetcam.com/blog/ 2026-11-06T17:49:01Z OpenPetCam contributors A 4D model of the room using a stationary $12 camera and wave physics https://openpetcam.com/blog/room-in-4d.html 2026-11-06T17:49:01Z How I used a camera sweep, a floor echo and neural depth estimates to build a rough 3D room, then added observations over time.