Fluid simulation · qwen3.5-35b-a3b
Output saved · Stopped by an API error Cost / run $0.0078 Runtime 218.6s
A model request failed and its retries ran out. The output is the HTML saved before that.
Prompt for this run
Build an interactive 2D fluid-and-dye simulation on a full-screen canvas. 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. No third-party libraries are provided. Required behavior: - Maintain a velocity field and a colored dye field. Advect dye through the moving fluid so it forms persistent swirling flow; a collection of independent fading particles is not sufficient. - Dragging injects dye and momentum in the drag direction. Momentum and dye remain visible after the pointer is released and gradually dissipate. Approximate fluid behavior is acceptable; choose the numerical method and Canvas 2D or WebGL implementation. - Seed the initial scene with a small amount of colored dye and motion so the simulation is visible on load. - Provide a color selector, Pause/Resume, and Clear. Clear removes dye and resets velocity; the next drag can start a new flow. - Bound simulation resolution and work per frame so controls remain responsive at a 1200 by 800 viewport. Verify: Drag through the canvas and sample the flow after release. Check that dye follows the drag, continues swirling, and responds to a second drag in another direction. Use Clear, then drag again to check that a fresh flow can start.
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 · 18 messages
Build an interactive 2D fluid-and-dye simulation on a full-screen canvas. 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. No third-party libraries are provided. Required behavior: - Maintain a velocity field and a colored dye field. Advect dye through the moving fluid so it forms persistent swirling flow; a collection of independent fading particles is not sufficient. - Dragging injects dye and momentum in the drag direction. Momentum and dye remain visible after the pointer is released and gradually dissipate. Approximate fluid behavior is acceptable; choose the numerical method and Canvas 2D or WebGL implementation. - Seed the initial scene with a small amount of colored dye and motion so the simulation is visible on load. - Provide a color selector, Pause/Resume, and Clear. Clear removes dye and resets velocity; the next drag can start a new flow. - Bound simulation resolution and work per frame so controls remain responsive at a 1200 by 800 viewport. Verify: Drag through the canvas and sample the flow after release. Check that dye follows the drag, continues swirling, and responds to a second drag in another direction. Use Clear, then drag again to check that a fresh flow can start.
thinking
The user wants me to build an interactive 2D fluid-and-dye simulation. Let me break down the requirements: 1. Full-screen canvas with velocity field and colored dye field 2. Advect dye through the moving fluid (persistent swirling flow) 3. Dragging injects dye and momentum in the drag direction 4. Momentum and dye remain visible after pointer release, gradually dissipate 5. Seed initial scene with small amount of colored dye and motion 6. Controls: Color selector, Pause/Resume, Clear 7. Clear removes dye and resets velocity 8. Bound simulation resolution and work per frame for 1200x800 viewport Let me create a complete, self-contained index.html file with: - HTML structure - CSS for styling - JavaScript for the fluid simulation I'll implement a grid-based fluid simulation using a simplified version of the Stam method (stable fluids). The key components are: - Velocity field (u, v) - Dye field (RGBA) - Advection (dye moving through velocity) - Force application (mouse drag) - Divergence, pressure solve, and gradient subtraction (for incompressible flow) Let me write this complete implementation:
I'll create a complete 2D fluid-and-dye simulation with all the required features. Let me build this step by step.
{"command":"pwd && ls -la"}/tmp/job-QLdzrf total 12 drwx------ 3 node node 4096 Oct 16 01:20 . drwxrwxrwt 6 root root 4096 Oct 16 01:20 .. drwxr-xr-x 3 node node 4096 Oct 16 01:20 .home
thinking
Good, I'm in the right directory. Now let me create the complete fluid simulation in index.html.
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Good, I'm in an empty directory. Let me create the complete fluid simulation in index.html.
/tmp/job-QLdzrf/index.html (22204 bytes)Successfully wrote to /tmp/job-QLdzrf/index.html
thinking
Now let me verify the file was written correctly and then open it in the browser to test the functionality.
Now let me verify the file exists and open it in the browser to test the simulation:
{"command":"ls -la /tmp/job-QLdzrf/index.html && head -50 /tmp/job-QLdzrf/index.html"}-rw-r--r-- 1 node node 22204 Oct 16 01:23 /tmp/job-QLdzrf/index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>2D Fluid & Dye Simulation</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { background: #1a1a2e; overflow: hidden; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; } #canvas { display: block; width: 100vw; height: 100vh; cursor: crosshair; } #controls { position: fixed; top: 10px; left: 10px; background: rgba(0, 0, 0, 0.8); padding: 15px 20px; border-radius: 10px; display: flex; flex-direction: column; gap: 12px; z-index: 100; color: #fff; } #controls label { display: flex; align-items: center; gap: 10px; font-size: 14px; } #colorPicker { width: 50px; height: 30px;
thinking
Good, the file is written correctly. Now let me open it in the browser and test the simulation. I'll use the browser tool to inspect the page and check the output.
{"command":"python3 -c \"import http.server; print('Server starting on http://0.0.0.0:8080')\" 2>/dev/null || python3 -m http.server 8080 &"/bin/bash: line 1: python3: command not found
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No Python3 available. Let me try to use the browser tool directly to open the HTML file.
{"command":"python3 -m http.server 8080 &"}/bin/bash: line 1: python3: command not found
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Python3 is not available. Let me try to use the browser tool to load the file directly.
{"command":"which python3 || which python || which node"}/usr/local/bin/node
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Node.js is available. Let me use it to serve the HTML file.
{"command":"node -e \"\nconst http = require('http');\nconst fs = require('fs');\nconst path = require('path');\n\nconst server = http.creatnode:events:487 throw er; // Unhandled 'error' event ^ Error: listen EADDRINUSE: address already in use :::8080 at Server.setupListenHandle [as _listen2] (node:net:2009:16) at listenInCluster (node:net:2066:12) at Server.listen (node:net:2171:7) at [eval]:18:8 at runScriptInThisContext (node:internal/vm:219:10) at node:internal/process/execution:451:12 at [eval]-wrapper:6:24 at runScriptInContext (node:internal/process/execution:449:60) at evalFunction (node:internal/process/execution:283:30) at evalTypeScript (node:internal/process/execution:295:3) 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: '::', port: 8080 } Node.js v24.18.0
thinking
Server is already running on port 8080. Let me use the browser tool to open the page.