raymarchcity
A free generative art piece — play it in your browser, no install. Audio-driven raymarched night city — the whole thing in one fragment shader. Drop in an mp3.
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Open the live demo Source on GitHubFrom the README
音频驱动的 raymarching 夜城。整座城市——楼、招牌、路面、车流、雨、雾、霓虹——都在一个 fragment shader 里算出来，没有一个模型文件。丢一首歌进窗口，城市跟着节拍呼吸。
在线：（桌面、手机都行，打开点一下就放）
浏览器里拖进来的歌存在 IndexedDB 里，下次打开还在。歌词自动去 lrclib 查（对歌手，避免同名歌），也缓存在本地。
右下角的画质滑块从 0.4 到 2.0。1.0 是原生分辨率，往上是超采样（好显卡上很好看，普通笔记本会掉帧）；帧率不够时它会自己往下退，但不会自己往上加。
光：霓虹灯管按线段做解析面光源（3 点 Gauss–Legendre + 发光面余弦 + 两点遮挡探针），所以对面的墙是真的被照亮的。 后期：HDR 半浮点 RT → TAA 重投影 → 渲染分辨率合成（ACES、bloom、变形镜光条、按弥散圆门控的色差、散景景深）→ 满分辨率收尾（CAS 锐化、颗粒、文字、黑边）。 音频分析：FFT 2048，谱通量起音检测，归一化自相关 + 对数正态节奏先验 + 7 点中值锁 BPM，段落检测。全部跑在独立的 60Hz 定时器上，不挂渲染循环。
Superpowers (Night Remix) — 原曲 Daniel Caesar.
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