Reaction-diffusion · solar-pro4
Run a Gray-Scott reaction-diffusion simulation on a canvas that grows organic Turing patterns in real time, with the mouse seeding new growth.
transcript · 6 messages
Run a Gray-Scott reaction-diffusion simulation on a canvas that grows organic Turing patterns in real time, with the mouse seeding new growth.
thinking
The user wants a Gray-Scott reaction-diffusion simulation running on a canvas with organic Turing patterns in real time, and mouse interaction to seed new growth. Let me create a single self-contained HTML file with: 1. A canvas for rendering 2. Gray-Scott reaction-diffusion simulation using two grids (U and V concentrations) 3. Mouse interaction to seed new growth 4. Nice visual presentation Key parameters for Gray-Scott: - U: feed rate (f) - V: kill rate (k) - Diffusion rates: Du, Dv - The reaction: U + V → 2V, and V → inert product The classic setup: - Du = 0.16, Dv = 0.08, f = 0.035, k = 0.065 (spots) - Or other parameter combinations for different patterns Let me build a robust implementation.
/tmp/ws/index.html (14004 bytes)Successfully wrote 14004 bytes to /tmp/ws/index.html
thinking
The file is written. Let me verify it exists and give a brief summary.
{"command":"ls -la /tmp/ws/index.html && wc -l /tmp/ws/index.html"}-rw-r--r--. 1 node node 14015 Aug 13 01:33 /tmp/ws/index.html 491 /tmp/ws/index.html
thinking
**Preparing to confirm file location**
`/tmp/ws/index.html` — single self-contained file, no external resources. Open it in a browser (or serve with any static server) to run the simulation. What's included: - **Gray-Scott reaction-diffusion** on a 360×360 periodic grid, rendered to a 720×540 canvas via nearest-neighbor scaling for a crisp organic look. - **Sharedelbrot-style color map**: nearly-black background with teal→purple highlights on the V concentration, tuned for the classic Turing-spot / stripe / maze aesthetics. - **Live parameter sliders** for feed (f), kill (k), Du, Dv with numeric readouts. - **Six presets** (Mitosis, Spots, Worms, Waves, Coral, Maze) — click to load and auto-reseed. - **Mouse seeding**: click/drag to inject V and seed new growth; the pattern blooms outward from the brush. - **Scroll-wheel brush radius** control (2–20 grid cells). - **Touch support** for mobile. - **Pause/Resume** and **Reset** buttons. - Runs at ~2 substeps per frame for visible pattern evolution without sacrificing stability.
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
EVALUATION
Gray-Scott sim shows spots; mouse click/drag seed growth, arrows/wasd add clusters, but patterns look sparse and dot-like, not organic Turing patterns.
Vision grade · anthropic/claude-sonnet-5
MEASUREMENTS
Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.