2b:null 2c:["$","title",null,{"children":"GROK4 HEAVY + Three.js: Flight Path | Red Sift | Observable"}] 31:T9a6,**Mission** Write an ES-module (Three.js r164+) exporting a single async function: createEarthFlightViz( container: HTMLElement, route: Array<[lat: number, lon: number]>, progress: number, // 0 → 1, % of current leg complete opts?: { globeRadius?: number, // default 1 dayTextureUrl?: string, // defaults supplied nightTextureUrl?: string, ribbonColors?: { done: string; todo: string }, clouds?: boolean, onDispose?: () => void } ): Promise<{ updateProgress(p: number): void; dispose(): void }> **Scene graph** 1. **Globe** – a `Mesh` with * `MeshPhongMaterial` diffuse map = day texture, * `emissiveMap` = night-lights texture only visible where surface is in darkness (blend in the fragment shader with a terminator mix). 2. **Sunlight** – one `DirectionalLight`; its direction is derived from the current UTC date to deliver a correct real-time day/night terminator. 3. **Flight ribbon** – a geodesic curve following the route: * compute great-circle points per leg, sample ≥ 200 points, build a `CatmullRomCurve3`. * feed the curve to `TubeGeometry`. * in the vertex shader set `vProgress = vertexIndex / (total-1)`; in the fragment shader lerp between `ribbonColors.done` and `ribbonColors.todo` so the first `progress` fraction is “done”. 4. **Controls** – `OrbitControls` with inertia; wheel zoom; double-click reset. **Animation & timing** * The globe rotates at the correct sidereal rate so one full spin ≈ 23 h 56 m. * `updateProgress()` enables external animation of the ribbon (e.g. GSAP / tween loop). * `requestAnimationFrame` main loop; clean up GPU resources in `dispose()`. **Performance** * Re-use textures, call `texture.dispose()` + `geometry.dispose()` on teardown. * Use `PMREMGenerator` for environment map once at init. **Acceptance tests** * At `progress = 0` only the origin dot is tinted “done”; at `1` the whole path is tinted. * Switching system clock ahead shifts the terminator & night lights correctly. * Resizing the `container` maintains a 60 fps render on a 2023 MacBook Air in Chrome. **Deliverables** * A single self-contained file with the ES-module, no external build steps. * Include one inline example (inside a hidden `