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
--- a/index.html
+++ b/index.html
@ -0,0 +1,129 @@
+<!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>