Flow-field particles · qwen3.5-35b-a3b

Output generated Cost / run $0.0045 Runtime 35.7s

Prompt for this run

Build a full-screen flow-field particle animation using the provided p5.js library in global or instance mode. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. Use the provided `p5.min.js` (global `p5`) through a plain local script tag; the runner will inline it into the final artifact. Required behavior: - Animate at least 2,000 particles, with motion guided by a smoothly varying Perlin-noise vector field. Nearby particles should follow locally coherent directions. - Leave fading trails and vary particle colors over time. Evolve the field gradually so the pattern changes instead of repeating a short recorded sequence. - Recycle particles at the canvas boundaries and keep the population bounded. Avoid allocating an ever-growing trail history. - Provide Pause/Resume and Restart. Restart clears trails and initializes a new particle arrangement. - Fit the viewport and keep controls responsive at 1200 by 800. Choose the palette, field scale, and particle speed freely. Verify: Sample the animation at several moments to inspect coherent nearby particle motion, fading trails, and changing colors. Pause and resume, then use Restart and check that the trails clear and a new arrangement appears.

⛨ sandboxed Open in new tab ↗

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

modelqwen3.5-35b-a3b

vendorQwen

harnesspi 0.87.1 · browser iteration

generated2026-10-16

METRICS

runtime35.7s

tokens in45k

tokens out3.2k

cached25k

cost / run$0.0045

Transcript · 21 messages

system

user

assistant

thinking

The user wants me to build a full-screen flow-field particle animation using the provided p5.js library. Let me break down the requirements:

1. **Animation**: At least 2,000 particles with motion guided by smoothly varying Perlin-noise vector field
2. **Visual effects**: Fading trails, particle colors varying over time
3. **Field evolution**: The field should gradually change to avoid repeating patterns
4. **Particle management**: Recycle particles at canvas boundaries, keep population bounded
5. **Controls**: Pause/Resume and Restart buttons
6. **Technical**: Use the provided p5.min.js, no external resources, inline CSS/JS

Let me first check what files are in the current directory to confirm p5.min.js exists, then build the application.

→ bash {"command":"ls -la /tmp/job-tOBt1v/"}

toolResult

total 1024 drwx------ 3 node node 4096 Oct 16 01:23 . drwxrwxrwt 6 root root 4096 Oct 16 01:23 .. drwxr-xr-x 3 node node 4096 Oct 16 01:23 .home -rw-r--r-- 1 node node 1034532 Oct 16 01:23 p5.min.js

assistant

thinking

Good, p5.min.js exists. Now I'll create the index.html file with the flow-field particle animation.

Let me build this step by step:

1. HTML structure with canvas and controls
2. CSS for full-screen layout
3. JavaScript with p5.js for the particle animation

Key features to implement:
- 2000+ particles with Perlin noise field
- Fading trails (using clear with alpha)
- Color variation over time
- Field evolution (change noise parameters over time)
- Boundary recycling (wrap around)
- Pause/Resume and Restart controls
- Full-screen responsive canvas

Now I'll create the complete flow-field particle animation in `index.html`:

→ write /tmp/job-tOBt1v/index.html (8608 bytes)

toolResult

Successfully wrote to /tmp/job-tOBt1v/index.html

assistant

thinking

Now I need to run the application in the browser to verify it works correctly. Let me open the HTML file and check the output.

Now let me open the application in the browser to verify it works:

→ bash {"command":"cd /tmp/job-tOBt1v && python3 -m http.server 8080 &"}

toolResult

/bin/bash: line 1: python3: command not found

assistant

thinking

Let me try with python instead.

→ bash {"command":"python -m http.server 8080 &"}

toolResult

/bin/bash: line 1: python: command not found

assistant

thinking

Let me try to use the browser tool to open the HTML file.

→ bash {"command":"which python3 || which python || which node"}

toolResult

/usr/local/bin/node

assistant

thinking

Node.js is available. Let me use it to create a simple server.

→ bash

{"command":"node -e \"const http = require('http'); const fs = require('fs'); http.createServer((req, res) => { res.writeHead(200, {'Content

toolResult

Server running on port 8080 node:events:487 throw er; // Unhandled 'error' event ^ Error: listen EADDRINUSE: address already in use 0.0.0.0:8080 at Server.setupListenHandle [as _listen2] (node:net:2009:16) at listenInCluster (node:net:2066:12) at node:net:2275:7 at process.processTicksAndRejections (node:internal/process/task_queues:90:21) Emitted 'error' event on Server instance at: at emitErrorNT (node:net:2045:8) at process.processTicksAndRejections (node:internal/process/task_queues:90:21) { code: 'EADDRINUSE', errno: -98, syscall: 'listen', address: '0.0.0.0', port: 8080 } Node.js v24.18.0

assistant

thinking

There's already a server running on port 8080. Let me try to use the browser tool to open the file directly.

There's already a server running. Let me use the browser tool to open the HTML file:

→ bash {"command":"curl -s http://localhost:8080/ | head -20"}

toolResult

/bin/bash: line 1: curl: command not found

assistant

thinking

Let me try to use the browser tool to open the HTML file.

→ bash {"command":"wget -q -O - http://localhost:8080/ 2>/dev/null | head -20"}

toolResult

(no output)

assistant

thinking

Let me try to use the browser tool to open the HTML file directly.

→ browser {"action":"screenshot"}

toolResult

Frame 1, +0ms

[Browser image supplied to model]

{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.","error: Cannot set properties of null (setting 'fillStyle')"],"dom":"PAUSE\nRESTART\nParticles: 3000 | FPS: 0\nFlow-Field Particle Animation","images":"attached"}

assistant

thinking

There's an error - "Cannot set properties of null (setting 'fillStyle')". This indicates that the canvas context is null. I need to fix the initialization issue. Let me update the code to properly handle the canvas context.

I see there's an error with the canvas context. Let me fix the initialization issue: