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Neon Koi

A koi woven from cyan and magenta light swims over rain-dark asphalt, its split silk tail writing glowing ripples across a puddle. Neon noir. Loops.

Background, V1 Effects3DSeamless loop, verified150 lines of codev1.0.0

In Light, glass & shine, Liquids, Nature & weather, Made for phones

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Neon Koi preview
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Live, running the real source at reduced resolution.

Combine several clips and hand them over together from your sequence.

A finished film

It plays exactly as rendered and has nothing to adjust. The preview runs the same code your AI receives.

View code Sample video (2.4 MB)
Info

What it is

A koi fish made of cyan and magenta light swims through a rain-dark city puddle. It has overlapping scale arcs, articulated fins, a split flowing tail, glass eyes and barbels, and its tail writes luminous ripples across the water while rain falls and neon signs smear in vertical streaks on both sides. Everything is drawn in the shader, and the 8 seconds loop seamlessly. The film has no settings.

Reuse it in your own idea

  • Nightlife promo: the cyan and magenta read well behind white headlines.
  • Seamless loop: the koi circles back to its start, so it repeats for any length.
  • Streaming or music-channel background: a lively centre with calm edges.

Which part is reusable

src/neon-koi.js is the ingredient your AI reuses. demo.js is only the example scene around it, and uses the demo harness only for the demo.

Good to know

  • The film is finished: it has no settings. To change colours or timing, edit the shader.
  • It is composed for a 4:5 portrait frame.
  • Its length is fixed at 8 seconds; repeat the loop to fill a longer clip.

Technical details

Technical details
Implementation
Three.js 0.185.1 (WebGL) · ES module src/neon-koi.js
Exports
  • createNeonKoi() => { scene, camera, setSize(width, height), update(time), dispose() }
Dependencies (exact)
  • three@0.185.1 (source) — Renderer and a full-screen shader material.
  • apw-runtime@1.0.0 (demo) — Demo harness.
How it fits a scene

Coordinates: Composed for a 4:5 portrait frame and measured by the frame height: in a wider frame the picture stays centred at full height and its background fills the sides; in a narrower one, such as 9:16, the sides are cropped.

Lighting: Self-lit neon: reflections and a glowing wake on wet asphalt.

Timing: The koi swims in place while its tail writes ripples; rain falls and the neon streaks flicker; the last frame matches the first.

Output
1080×1350, 30 fps, 8 s · procedural (computed from the frame number) · seamless loop — Every part of the film is a function of the time modulo its length, and every motion completes whole cycles, so the last frame meets the first.
Tested
Rendered 240 frames on 2026-10-10 in Chrome 154.0.8037.97 headless on Linux 7.0.0-38-generic (x64), Node 22.14.0 (WebGL 2 via SwiftShader (software)). Same frame twice from fresh pages: identical. Loop: Frame 0 vs end state (progress 1): mean |Δ| 0.0000, max |Δ| 0 of 255.
Performance
One full-screen fragment shader. About 7 ms a frame at 1080 by 1350 on an integrated Intel GPU (Iris Xe), and about 1 s a frame with software WebGL. Plays at 30 frames a second at full size on an integrated GPU.
Export a video yourself
Download the source, then in the folder: npm install npm run render -- neon-koi/1.0.0 --out my-video.mp4Needs Node 18+, ffmpeg and Chrome/Chromium. Add --params my-settings.json (from Copy settings) for your own settings.
Version
1.0.0 · sha256:45c2be6ce6d3e967…
Files
License
MIT. Copyright (c) 2026 AI Pixel Wizard. Released under the MIT License. See LICENSE in this folder. License details
Provenance
From the owner's collection Twenty Impossible Worlds: the original GLSL ES 3.00 shader of the film “Neon Koi”, created with ChatGPT / Codex and used as published, wrapped for AI Pixel Wizard as a three.js full-screen shader in October 2026. The collection's synthesised soundtrack is not part of this ingredient.
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