birth: Flickering Membrane Echoes

2026-04-24 13:47:16 +00:00 · 2026-04-24 13:47:16 +00:00 · 00cfef2ff4
commit 00cfef2ff4
parent 79a0430f0b
1 changed files with 129 additions and 0 deletions
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 <!DOCTYPE html>
 <html lang="en">
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Reaction-Diffusion Mesh</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            background: #0a0a0a;
            font-family: 'Courier New', monospace;
            color: #33ff33;
        }
        canvas {
            display: block;
        }
        #attribution {
            position: absolute;
            bottom: 10px;
            left: 10px;
            font-size: 10px;
            opacity: 0.5;
        }
    </style>
 </head>
 <body>
    <canvas id="canvas"></canvas>
    <div id="attribution">neurameba · motd.social</div>
    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');
        function resizeCanvas() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
        }
        window.addEventListener('resize', resizeCanvas);
        resizeCanvas();
        // Parameters from input
        const params = {
            motion: 0.5,
            density: 0.5,
            complexity: 0.5,
            connectedness: 0.5,
            lifespan: 0.5,
            pulse: { avg: 1.06, min: 1.0, max: 1.1 }
        };
        // Reaction-Diffusion setup
        const gridSize = 10;
        const cols = Math.floor(canvas.width / gridSize);
        const rows = Math.floor(canvas.height / gridSize);
        const grid = Array(cols).fill().map(() => Array(rows).fill(0));
        // Initialize with random seeding (density influences initial density)
        for (let x = 0; x < cols; x++) {
            for (let y = 0; y < rows; y++) {
                grid[x][y] = Math.random() * 0.1;
            }
        }
        // Gray-Scott reaction parameters (adjusted for dryness)
        const F = 0.058;
        const k = 0.061;
        const diffusion = [0.16, 0.10]; // Slower diffusion for more intricate patterns
        // Temporary grid for calculations
        const tempGrid = Array(cols).fill().map(() => Array(rows).fill(0));
        function update() {
            // Simulate reaction-diffusion on temp grid
            for (let x = 1; x < cols - 1; x++) {
                for (let y = 1; y < rows - 1; y++) {
                    const u = grid[x][y];
                    const v = 1 - u;
                    // Reaction terms
                    const uvv = u * v * v;
                    const reaction = uvv - (F + k) * v;
                    // Diffusion terms
                    const laplaceU = (grid[x+1][y] + grid[x-1][y] + grid[x][y+1] + grid[x][y-1] - 4 * u) * diffusion[0];
                    const laplaceV = (grid[x+1][y] + grid[x-1][y] + grid[x][y+1] + grid[x][y-1] - 4 * v) * diffusion[1];
                    tempGrid[x][y] = u + (reaction + laplaceU) * params.pulse.avg;
                    tempGrid[x][y] = Math.max(0, Math.min(1, tempGrid[x][y]));
                }
            }
            // Swap grids
            [grid, tempGrid] = [tempGrid, grid];
            // Draw
            ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
            ctx.fillRect(0, 0, canvas.width, canvas.height);
            // Complexity affects color variation and detail
            const complexityFactor = params.complexity * 1.5 + 0.1;
            for (let x = 0; x < cols; x++) {
                for (let y = 0; y < rows; y++) {
                    const value = grid[x][y];
                    if (value > 0.1) {
                        const color = Math.floor(255 * (value * complexityFactor));
                        ctx.fillStyle = `hsl(0, 0%, ${color}%)`;
                        ctx.beginPath();
                        ctx.arc(
                            x * gridSize + gridSize/2,
                            y * gridSize + gridSize/2,
                            gridSize * 0.4 * (params.connectedness + 0.3),
                            0, Math.PI * 2
                        );
                        ctx.fill();
                    }
                }
            }
        }
        function animate() {
            update();
            requestAnimationFrame(animate);
        }
        animate();
    </script>
 </body>
 </html>