icurtis1/off-axis-sneaker — reverse-engineered prompt

Build me a browser app that uses my webcam to track my face and create that head coupled perspective illusion, where a 3D object feels like it is sitting behind the screen and shifts naturally as I move my head. I want it to open with a clean modern interface, ask for camera permission nicely, and then show an interactive 3D shoe model by default.

Please include a simple calibration flow so I can enter my screen size and usual viewing distance for a more convincing effect, and save that locally. I also want controls to move, rotate, and scale the model, plus buttons for full screen, settings, and a debug mode with visual helpers. A small face preview in the corner would be great so I can tell tracking is working.

It should feel smooth and responsive, reduce jitter, handle errors gracefully if the camera or online model assets are unavailable, and work in modern desktop browsers. If you need to, look up current docs online and make sensible choices.