夜晚城市屋顶的第三人称射击游戏（Three.js）

Build a browser-based third-person shooter in Three.js, inspired by a gritty noir action game, delivered as a small web project that runs locally. The setting is a night-time city rooftop with dark skyscrapers in the background, warm orange street lamps, a glowing neon sign over a small building, hedges and low cover. The player controls an armored soldier seen from behind, moves around the rooftop and fires a firearm at enemy gunmen who appear across the roof. Shooting must feel punchy: visible muzzle flash, tracer lines, ejected brass casings that fall and bounce, hit feedback and a short slow-motion effect on key moments. Add a minimal HUD with ammo count, a score counter and a mission line such as clearing the rooftop. Use simple stylized lighting with fog and bloom for the night mood, and load character models from an online source if needed. Done when the rooftop is playable from start to cleared state, controls respond smoothly and gunplay reads clearly.