随历任总统变化的椭圆形办公室 Three.js 交互场景

Build an interactive Three.js web app that shows how the Oval Office looked under different U.S. presidents. Start with a top-down cutaway view of the round room floating on a soft light-grey background, with a stylised, slightly toy-like look: cream walls, tall windows with drapes, a carpet, a desk, sofas, armchairs, lamps, flags and potted plants. Add a bottom bar of small thumbnail cards, one per presidency, and a small text panel at the top left with a short description of the selected era. Selecting a card swaps the carpet, drapes, furniture and decor to match that period with a smooth transition. Include view modes so the user can switch between the overhead cutaway and a first-person style camera that glides inside the room toward the desk, the fireplace with a portrait above it, and the ceiling seal. Use orbit-style mouse controls. Deliver a single web project that runs in the browser. Done when every era loads, the camera moves smoothly, and the room differences are clearly visible.