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Ricky Reusser
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kelvin-wake/bundle.js
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kelvin-wake/bundle.js
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kelvin-wake/index.html
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kelvin-wake/index.html
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<!DOCTYPE html><html lang="en" dir="ltr"><head><title>Kelvin Wake Pattern</title><meta charset="utf-8"><meta name="application-name" content="Kelvin Wake Pattern">
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<meta name="subject" content="Visualizing the velocity-independent wake angle in deep water waves">
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<meta name="abstract" content="Visualizing the velocity-independent wake angle in deep water waves">
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<meta name="twitter:title" content="Kelvin Wake Pattern">
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<meta name="description" content="Visualizing the velocity-independent wake angle in deep water waves">
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<meta name="twitter:description" content="Visualizing the velocity-independent wake angle in deep water waves">
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<meta name="author" content="Ricky Reusser">
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<meta name="twitter:creator" content="Ricky Reusser">
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<meta name="twitter:image" content="http://rreusser.github.io/src/src/kelvin-wake/thumbnail.jpg">
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<meta name="twitter:card" content="summary_large_image">
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<meta property="og:title" content="Kelvin Wake Pattern">
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<meta property="og:description" content="Visualizing the velocity-independent wake angle in deep water waves">
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<meta property="article:author" content="Ricky Reusser">
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<meta property="og:image" content="http://rreusser.github.io/src/src/kelvin-wake/thumbnail.jpg">
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<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" /></head><body><script src="bundle.js"></script><script src="../nav.bundle.js"></script></body></html>
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sketches/static/kelvin-wake-thumbnail.jpg
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sketches/static/kelvin-wake-thumbnail.jpg
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@ -8,20 +8,21 @@ const mat4fromScaling = require('gl-mat4/fromScaling');
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const { Pane } = require('../../lib/tweakpane.js');
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const PARAMS = window.p = {
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kCenter: 0.67,
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kRange: 0.0,
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lCenter: 0.5,
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lRange: 0.5,
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speed: 1.0,
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};
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const pane = window.pane = new Pane({title: 'Parameters'});
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pane.addBinding(PARAMS, 'kCenter', {min: 0, max: 1});
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pane.addBinding(PARAMS, 'kRange', {min: 0, max: 1});
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pane.addBinding(PARAMS, 'speed', {min: 0, max: 2});
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pane.addBinding(PARAMS, 'lRange', {min: 0.01, max: 1, label: 'wavelength spread, ∆λ', step: 0.01});
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pane.addBinding(PARAMS, 'lCenter', {min: 0, max: 1, label: 'wavelength center, λ₀', step: 0.01});
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pane.addBinding(PARAMS, 'speed', {min: 0.5, max: 2, step: 0.01});
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require('insert-css')(`
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html, body { background: #333; }
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body > canvas { z-index: -1; }
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.sketch-nav { right: auto !important; left: 0 !important;
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.tp-dfwv { position: fixed !important; }
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}`);
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createREGL({
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@ -79,9 +80,9 @@ function run (regl) {
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precision highp float;
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varying vec2 xy;
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uniform float kCenter, kRange, speed;
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uniform float lCenter, lRange, speed;
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vec3 COL = vec3(51, 107, 207) / 255. * 1.25;
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vec3 COL = vec3(0, 107, 227) / 255. * 1.25;
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vec3 GAMMA = vec3(2.2);
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vec3 tanh(vec3 x) {
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@ -100,28 +101,30 @@ function run (regl) {
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float km = ${Math.PI * 2} * 4.0;
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float weightSum = 0.0;
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float fracMin = max(0.0, kCenter - kRange);
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float fracMax = min(kCenter + kRange, 1.0);
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float fracMin = lCenter - lRange;
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float fracMax = lCenter + lRange;
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const float fracStationary = 2.0 / 3.0;
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vp = w/k = sqrt(g/k)
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const int N = 64;
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vec2 computeFrac = vec2(fracMin, (fracMax - fracMin) / float(N - 1));
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vec2 computeFrac = vec2(fracMin, (fracMax - fracMin)) / speed;
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for (int i = 0; i < N; i++) {
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float frac = dot(vec2(1.0, float(i)), computeFrac);
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float t = float(i) / float(N-1);
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//float frac = dot(vec2(1.0, t), computeFrac);
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float frac = t;
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float strength = exp(-pow((frac - lCenter / speed) / lRange, 2.0));
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float weight = exp(-pow(frac-kCenter, 2.0) * 8.0);
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if (frac > 1.0) continue;
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frac *= speed;
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vec2 k = (km/frac) * vec2(sqrt(frac), sqrt(1.0 - frac));
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k /= speed;
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float weight = frac * strength* (0.1 + 0.9 * t * (1.0 - t));
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f += weight * sin(min(dot(k, r), 0.0));
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weightSum += weight;
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}
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f /= weightSum;
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if (weightSum > 0.0) f /= weightSum;
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vec3 col = pow(COL, GAMMA) + f * 1.5;
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vec3 col = pow(COL, GAMMA) + f * 2.5;
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col = 0.5 + 0.5 * tanh(col - 0.5);
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gl_FragColor = vec4(pow(col, 1.0/GAMMA), 1);
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@ -130,12 +133,12 @@ function run (regl) {
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const vec2 kKelvin = vec2(sin(thetaKelvin), cos(thetaKelvin));
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float fIdeal = dot(kKelvin, r);
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fIdeal /= fwidth(fIdeal);
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gl_FragColor.rgb = mix(gl_FragColor.rgb, vec3(1, 0, 0), linearstep(1.5, 0.5, abs(fIdeal)));
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gl_FragColor.rgb = mix(gl_FragColor.rgb, vec3(1, 0, 0), 0.5 * linearstep(2.5, 1.5, abs(fIdeal)));
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}`,
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attributes: { uv: [-4, -4, 4, -4, 0, 4] },
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uniforms: {
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kCenter: regl.prop('kCenter'),
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kRange: regl.prop('kRange'),
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lCenter: regl.prop('lCenter'),
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lRange: regl.prop('lRange'),
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speed: regl.prop('speed'),
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},
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depth: {enable: false},
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@ -1,6 +1,6 @@
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{
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"title": "Kuramoto",
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"description": "The Kuramoto model for a system of spatially coupled oscillators",
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"order": 3700,
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"image": "http://rreusser.github.io/src/src/kuramoto/thumbnail.jpg"
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"title": "Kelvin Wake Pattern",
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"description": "Visualizing the velocity-independent wake angle in deep water waves",
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"order": 3900,
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"image": "http://rreusser.github.io/src/src/kelvin-wake/thumbnail.jpg"
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}
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src/src/sketches/static/kelvin-wake-thumbnail.jpg
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src/src/sketches/static/kelvin-wake-thumbnail.jpg
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