Reaction-diffusion · qwen3.5-35b-a3b
Output generated Cost / run $0.0036 Runtime 32.4s
Prompt for this run
Build a Gray-Scott reaction-diffusion simulation on a 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 two chemical concentration fields, U and V, with diffusion and the Gray-Scott reaction, feed, and removal terms. Evolve these fields rather than displaying a prerecorded pattern. - Use a square simulation grid with wrapping boundaries. Choose stable time and spatial steps with parameters Du = 0.16, Dv = 0.08, feed = 0.035, and kill = 0.062 in simulation units. - Initially fill the field with U = 1 and V = 0, then seed a small central region with V and reduced U. Map concentrations to contrasting colors so evolving organic patterns are visible. - Clicking or dragging adds V and reduces U near the pointer. Provide Pause/Resume and Reset; Reset restores the initial fields and seed. - Choose Canvas 2D or WebGL, and bound grid resolution and work per frame to keep interaction responsive. Verify: Sample early field evolution, then seed a separate region with the pointer. Check that the added region affects the following frames. Pause and resume, then reset and compare the restored central seed with the initial scene.
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 · 7 messages
Build a Gray-Scott reaction-diffusion simulation on a 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 two chemical concentration fields, U and V, with diffusion and the Gray-Scott reaction, feed, and removal terms. Evolve these fields rather than displaying a prerecorded pattern. - Use a square simulation grid with wrapping boundaries. Choose stable time and spatial steps with parameters Du = 0.16, Dv = 0.08, feed = 0.035, and kill = 0.062 in simulation units. - Initially fill the field with U = 1 and V = 0, then seed a small central region with V and reduced U. Map concentrations to contrasting colors so evolving organic patterns are visible. - Clicking or dragging adds V and reduces U near the pointer. Provide Pause/Resume and Reset; Reset restores the initial fields and seed. - Choose Canvas 2D or WebGL, and bound grid resolution and work per frame to keep interaction responsive. Verify: Sample early field evolution, then seed a separate region with the pointer. Check that the added region affects the following frames. Pause and resume, then reset and compare the restored central seed with the initial scene.
thinking
The user wants me to build a Gray-Scott reaction-diffusion simulation. Let me create a single self-contained HTML file with:
1. Two chemical concentration fields (U and V)
2. Gray-Scott reaction-diffusion equations with:
- Du = 0.16, Dv = 0.08
- feed = 0.035, kill = 0.062
3. Square grid with wrapping boundaries
4. Initial state: U = 1, V = 0 everywhere, with a small central region having V > 0 and U < 1
5. Color mapping based on concentrations
6. Interactive controls:
- Click/drag to add V and reduce U
- Pause/Resume
- Reset
7. Canvas 2D or WebGL for rendering
Let me write this complete simulation:
```html
<!DOCTYPE html>
<html>
<head>
<title>Gray-Scott Reaction-Diffusion</title>
<style>
... CSS ...
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="controls">
<button id="pause">Pause</button>
<button id="reset">Reset</button>
</div>
<script>
... JavaScript ...
</script>
</body>
</html>
```
The Gray-Scott equations are:
- dU/dt = Du * (U_xx + U_yy) - UV^2 + feed(1-U)
- dV/dt = Dv * (V_xx + V_yy) + UV^2 - (kill + feed)*V
Let me implement this properly.
I'll create a complete Gray-Scott reaction-diffusion simulation in a single self-contained HTML file.
/tmp/job-ZwYdE4/index.html (12561 bytes)Successfully wrote to /tmp/job-ZwYdE4/index.html
thinking
Good, I've written the file. Now let me run it in the browser to verify the behavior.
Now let me run the application in the browser to verify the behavior:
{"action":"screenshot"}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.","log: Gray-Scott Reaction-Diffusion initialized","log: Grid: 128x128, Du=0.16, Dv=0.08, feed=0.035, kill=0.062","log: Initial: Central seed with V=0.5, U=0.5, rest U=1, V=0"],"dom":"Pause\nReset\nClick and drag to add chemicals","images":"attached"}
thinking
Let me read the file to see what was written:
The simulation has loaded! I can see the reaction-diffusion pattern forming with the characteristic pink and dark colors. Let me examine the actual implementation to verify it meets all requirements: