Lorenz attractor · claude-opus-5
Output generated Cost / run $0.2807 Runtime 93.9s
Prompt for this run
Using the pre-provided three.min.js (global THREE), visualize the Lorenz attractor as a glowing 3D butterfly trajectory that draws over time, with orbit-drag camera controls.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
METRICS
Transcript · 12 messages
Using the pre-provided three.min.js (global THREE), visualize the Lorenz attractor as a glowing 3D butterfly trajectory that draws over time, with orbit-drag camera controls.
I'll check the library first, then build the app.
{"command":"ls -la /tmp/ws && grep -o 'REVISION=\"[^\"]*\"' three.min.js | head -3"}total 592 drwxr-sr-x. 2 node node 26 Aug 3 00:22 . drwxrwsrwx. 3 root node 16 Aug 3 00:22 .. -rw-r--r--. 1 node node 603445 Aug 3 00:22 three.min.js
{"command":"grep -o 'REVISION *= *.\\{0,12\\}' three.min.js | head -3; grep -c 'BufferGeometry' three.min.js"}REVISION=e,t.RGBADept 1
{"command":"grep -o 'REVISION=[^,;]*' three.min.js | head; grep -o '\"1[0-9][0-9]\"' three.min.js | head -3; head -c 300 three.min.js"}REVISION=e "128" "100" /** * @license * Copyright 2010-2021 Three.js Authors * SPDX-License-Identifier: MIT */ !function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).THREE={})}(th
thinking
I'm skipping the standard orbit controls and building my own instead, plus handling the glow effect through additive blending with lines and sprites rather than using an effect composer. The core approach integrates the Lorenz system using fourth-order Runge-Kutta, renders the trajectory as a growing line with dynamic buffer geometry, and layers in a glowing effect using multiple additive lines plus a moving sprite head with a canvas-generated texture.
r128 confirmed. Writing the app:
/tmp/ws/index.html (14624 bytes)Successfully wrote 14624 bytes to /tmp/ws/index.html
thinking
Checking for potential issues with variable hoisting and function call ordering — `autoSpin` gets hoisted so the mousemove handler can reference it safely, and `resetTrail` doesn't depend on `autoSpin` anyway, so the initialization sequence is fine. Running through for syntax errors now.
{"command":"cd /tmp/ws && node -e \"\nconst h=require('fs').readFileSync('index.html','utf8');\nconst m=[...h.matchAll(/<script(?![^>]*src)[script 0 ok lib ref ok
thinking
The `autoSpin` variable is hoisted as a declaration, so even though it's referenced in the mousemove handler before its assignment, it's already available in scope when needed — no issues there.
`index.html` created in `/tmp/ws` — syntax-validated, loads `three.min.js` locally. **What it does:** - **RK4 integrator** for the Lorenz system, integrated per-frame with substeps so the trajectory draws progressively (up to 60k points) tracing the classic butterfly's two lobes. - **Glow without postprocessing:** three overlapping passes on shared position/color buffers — a crisp `Line`, an additive `Line`, and an additive canvas-generated radial-sprite `Points` halo, plus two pulsing sprites on the leading head. - Vertex colors shift hue with time and instantaneous velocity → iridescent ribbon; exponential fog + procedural starfield for depth. - **Hand-rolled orbit controls:** left-drag orbit, wheel zoom, right/shift-drag pan, one/two-finger touch equivalents, optional auto-orbit. - Live sliders for σ / ρ / β (restart trail on change), draw speed and glow intensity; restart / randomize / recenter buttons and a live state readout.