Create a maximum-ambition Three.js general-aviation flight simulator in perfect weather: a faithful single-engine light aircraft (Cessna-172 class) cruising in crystal-clear alpine morning air, with a complete, working, beautiful instrument panel filling the lower frame and a breathtaking clear view of the Alps - glaciers, ridgelines, valleys, lakes and villages - filling the windshield. This is the opposite of a storm-landing drama: the spectacle is clarity, fidelity and the pure joy of flight over magnificent terrain. It must not be an arcade ring course, a toy dashboard with fake gauges, an exterior-only flyby, or a hazy low-detail terrain. It is the most realistic cockpit view in the collection.
The goal is extreme fidelity in both directions at once: inside, a panel whose every instrument works and can survive full-screen inspection; outside, terrain so detailed and sunlit that every glance out the window is a poster. Use procedural generation, instancing and terrain LOD with discipline.
If you use Three.js, add an import map before the module script mapping "three" and "three/addons/" to the same pinned version, and import only via those names. Everything procedural; no external assets.
FIRST FRAME - ALREADY FLYING, ALREADY GLORIOUS
- Open mid-flight, straight and level at about 8,500 feet on a golden-clear morning: the panel lit by sun, the yoke gently alive, the propeller a shimmering translucent disc, and through the windshield a colossal glaciated massif (Matterhorn-class silhouette) slightly right of the nose, with a deep green valley, a turquoise lake and a village far below.
- Everything is already working: needles alive with subtle jitter, gyros settled, engine note implied by airframe vibration, wingtip visible in the left window, sun glinting off the cowling.
- No menus, loading screens, title cards or setup - hands-on-yoke from the first second.
THE PANEL - INSTRUMENT FIDELITY AS THE STAR
- Build the classic six-pack with true behavior: airspeed indicator (correct arcs and needle lag), attitude indicator with a properly geared artificial horizon that matches the outside world exactly at all times, altimeter with Kollsman window and correct triple-needle logic, turn coordinator with ball responding to yaw and slip, heading indicator that precesses slightly, and vertical speed indicator with realistic lag.
- Surround them honestly: tachometer, fuel gauges that slowly deplete, oil temperature and pressure, ammeter, engine controls (throttle, mixture, carb heat) with animated levers, elevator trim wheel that visibly moves and matters, flap switch with staged indicator, magneto/master switches, a working analog clock, and a compass in its fluid rocking with turns.
- Add a small GPS/nav display with a live moving map of the terrain below - the map must actually correspond to the world.
- Materials and craft: brushed panel metal, worn screws, glass over instruments with faint reflections of the pilot-side window light, sun flare crossing gauge glass in turns, yoke and pedals animating with control input, checklist card clipped to the yoke.
- Every instrument must be genuinely readable and correct enough that a pilot would nod: this is the fidelity showpiece.
THE WORLD - THE ALPS IN PERFECT LIGHT
- Build a vast alpine terrain with honest structure: a hero glaciated peak group, serrated ridgelines with sun-and-shadow interplay, hanging glaciers with crevasse banding, scree slopes, treeline transition into dense instanced conifer forest, alpine meadows, waterfalls threading cliff faces, a turquoise lake with sun glitter, and a valley floor with villages, church spires, roads with moving vehicles and a small airstrip.
- Distance is the luxury: visibility unlimited, ridge behind ridge fading through blues to a far horizon, no murk - the classic post-cold-front alpine clarity.
- Living details at cruise altitude scale: cloud shadows from scattered fair-weather cumulus drifting over slopes, a cable car crawling up a ridge, a paraglider wheeling below, birds, another light aircraft passing far off on an airway, smoke from a valley chimney rising straight in calm air.
- The sun must interact constantly with the scene: glacier faces blazing, lake glitter path, cockpit shadows moving across the panel in turns.
FLIGHT MODEL - REAL-FEELING, WELCOMING
- Implement honest light-aircraft dynamics: lift versus airspeed and angle of attack, stall with buffet cue and gentle wing drop, coordinated versus uncoordinated turns visible in the ball, trim actually relieving stick load, power changes causing pitch tendencies, and altitude affecting engine performance subtly.
- Default to a stability-assisted mode that keeps the aircraft honest but forgiving; a REALISM toggle removes assistance for full hand-flying.
- Controls: mouse-yoke or arrow keys plus throttle, trim, flaps and rudder keys, all discoverable from a compact overlay; gentle turbulence over ridgelines (mountain air is alive even on clear days), thermals over sunny faces that nudge the VSI.
- Flight is free: no rings, no missions. Suggested joys placed in the world: fly the lake shoreline, cross the glacier saddle, circle the summit, descend the valley to overfly the airstrip, chase your own aircraft shadow across a meadow.
CAMERA AND VIEWS
- Default is the pilot-eye cockpit view with the full panel; smooth head-look with mouse (panel stays believable at all angles), plus quick views: left window wing view, over-the-nose scenic, and one external chase camera that reveals the beautifully modeled aircraft (correct strut-braced high wing, registration painted on, control surfaces visibly deflecting with input, sun on the spinner).
- A photo mode hides UI and frees the camera around the flying aircraft.
PERFORMANCE
- Terrain uses concentric LOD with silhouette-perfect distant ridges; forests, buildings and vehicles instanced; the panel renders at bespoke maximum quality always - instruments never degrade.
- Quality selector reduces terrain shading richness, forest density and cloud shadow resolution before ever touching panel fidelity or horizon correctness.
- Smooth on a modern laptop, devicePixelRatio clamped to 2. The outcome: the clearest, calmest, most fidelity-obsessed cockpit on the web - flight as pure scenery and craft.
