Three.jsで、斜め上から見下ろす「箱庭」の3Dを作ってください。 題材：雨の夜の、水没したサイバーパンクの下層街 ・画像や3Dモデルは使わず、建物も看板も人も全部コードで作る ・建物はぎっしり。窓・室外機・配管・ネオン看板で壁を埋めて、何もない面を残さない ・霧の中で灯りがにじむように。ピントの外の光は丸くボケるように ・人が歩く、車が走る、湯気が上がる、雨が降る。画面のどこかで常に何かが動いている ・全景・路地・屋上など、視点を5〜7か所切り替えられるボタン ・ブラウザで開くだけで動くページにする ・できたら各視点のスクショを撮って、自分で見て直してから見せて
Make it yours. Change the 題材 line ("雨の夜の、水没したサイバーパンクの下層街", a flooded cyberpunk lower city on a rainy night) to your own place; the creator suggests 夕暮れの港町 (a harbor town at dusk), 昭和の屋台街, 雪の温泉街, or 空に浮かぶ島の村. Keep the lines about making everything in code and filling every wall.
Flooded cyberpunk district as a diorama
A rainy, flooded cyberpunk lower city under a giant elevated railway, with shacks stacked on pillars, koi holograms, and police cars overhead, seen through seven CCTV cameras, a drone, or by following a resident. Opus 5.5 built it all in code.
“建物も、看板の文字も、住人も、車も、雨も光も、すべてコードで生成。”
How it was made
The reply is a how-to written after the build, not the exact transcript: paste this starting prompt with only the 題材 (subject) line changed; open it and ask for one or two concrete fixes at a time ("全体が暗い", "もっとごちゃごちゃに"); add ways to play, such as weather buttons, a camera that follows one resident, drone and train views, and a fullscreen button; then ask "公開して" to publish it. The creator's tip: "1回で完成を狙わない。「見る→言う→直す」を何回か回すのがいちばんの近道" (don't aim to finish in one go; look, say, fix, a few times over). The live version also has haze, blackout, and dawn weather, a heat camera, and a density setting from 1 to 5.
Claude.ai · Claude Opus 5.5 · Three.js
Source and credit
X · Sep 26, 2026 · 803 likes · 146k views · 24 comments
Authorship not stated by the source
Published instructions: Reply on X, as a starting prompt to copy with the subject changed
Look notesby Reference
A neon cyberpunk lower city on a rainy night, seen through CCTV-style feeds: crowded shacks and signs, a canal, a stall marked OPEN, a drone's view, homes stacked on a pillar, a heat camera, and a grey dawn.
- Color
- Blue-black night lit by pink, cyan, amber, and green neon and strings of warm bulbs; a magenta-purple heat-camera pass; flat grey-white fog at dawn.
- Type
- Thin Japanese titles in white for each view (柱の輪, 水路, 追跡, 飛行, 過密, 熱源, 夜明け) with a red LIVE tag, camera numbers and timestamps in the corners, and the title 第七区 下層 in large spaced type on the opening and closing cards.
- Framing
- 16:9 inside CCTV corner brackets with a REC dot. Mostly high, tilted views into dense streets with shallow-focus bokeh; the drone and pillar shots are steep and close.
- Structure
- Title card over the neon city, a machine on a pillar, the canal, following a resident past an OPEN stall, the drone flight, the density view of stacked homes, the heat camera, dawn in fog, and the closing title card.
