Reaction-diffusion · qwen3.6-35b-a3b
Output generated Cost / run $0.0034 Runtime 43.5s
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 as a single self-contained HTML file. Let me plan this out: 1. Create a canvas-based simulation with U and V concentration fields 2. Use Gray-Scott reaction-diffusion equations 3. Parameters: Du = 0.16, Dv = 0.08, feed = 0.035, kill = 0.062 4. Wrapping boundaries (toroidal) 5. Initial state: U=1, V=0, with a small central region having V and reduced U 6. Click/drag interaction to add V and reduce U 7. Pause/Resume and Reset buttons 8. Keep it responsive Let me write the complete index.html file with inline CSS and JS.
/tmp/job-Bn8gTJ/index.html (10230 bytes)Successfully wrote to /tmp/job-Bn8gTJ/index.html
thinking
Good, the file is written. Now let me open it in the browser and verify it works. I need to: 1. Check initial rendering 2. Check early field evolution 3. Test clicking/dragging to seed V 4. Check that adding V affects following frames 5. Test Pause/Resume 6. Test Reset 7. Check console for errors
{"action":"screenshot"}Frame 1, +1ms
[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."],"dom":"Gray-Scott Reaction-Diffusion\nPause\nReset\nSpeed: 1x\nClick or drag to seed chemical V. Watch organic patterns emerge.\nFrame: 9 | Grid: 256x256 | Du=0.16 Dv=0.08 k=0.062","images":"attached"}
thinking
The application is running and displaying a Gray-Scott reaction-diffusion simulation. I can see: 1. A canvas showing the simulation with a central seed (light purple blob on dark background) 2. UI controls: Pause, Reset, Speed toggle 3. Status text showing "Frame: 9 | Grid: 256x256 | Du=0.16 Dv=0.08 k=0.062" 4. Instruction text about clicking/dragging to seed chemical V The simulation appears to be working - there's a central seed visible as a small purple spot. Let me check if the patterns are evolving properly by looking at the attached image. The central region shows a light-colored spot, which suggests the V chemical is present and potentially starting to evolve. Let me now verify the functionality by testing: 1. Clicking/dragging to seed V in a different region 2. Checking if Pause/Resume works 3. Checking if Reset restores initial state I should also check the code quality - let me read the file to verify the implementation is correct.
Let me read the implementation to verify correctness and check a few things. <tool_call> <function=read> <function=bash> <command>cat /tmp/job-Bn8gTJ/index.html </command> </function>