'use strict' Math.TAU = Math.PI * 2 Math.RAD = Math.PI / 180 Math.DEG = 180 / Math.PI Math.PHI = 0.5 + 0.5 * Math.sqrt 5 Math.random = do (x = 1) -> -> x ^= x << 13; x ^= x >>> 17; x ^= x << 5 1 - (x >>> 0) / 0xFFFFFFFF window.addEventListener 'load', -> canvas = document.createElement 'canvas' context = canvas.getContext '2d' document.body.appendChild canvas buffer = mat4.create() model = mat4.create() view = mat4.create() projection = mat4.create() mvp = mat4.create() points = [] colors = [] palette = [ [ 1.00, 0.50, 0.25, 0.75 ] [ 0.25, 0.50, 1.00, 0.75 ] ].map vec4.clone for _ in [0...25e3] ρ = 4/5 θ = Math.acos Math.random() * 2 - 1 φ = Math.random() * Math.PI * 2 x = ρ * Math.sin(θ) * Math.cos(φ) y = ρ * Math.sin(θ) * Math.sin(φ) z = ρ * Math.cos(θ) points.push v = vec4.fromValues x, y, z, 1 colors.push palette[0] for _ in [0...25e3] x = (1 - Math.random()**5) * ((Math.random()*2 << 1) - 1) y = (1 - Math.random()**5) * ((Math.random()*2 << 1) - 1) z = (1 - Math.random()**5) * ((Math.random()*2 << 1) - 1) points.push v = vec4.fromValues x, y, z, 1 colors.push palette[1] for _ in [0...50e3] x = Math.random() * 2 - 1 y = Math.random() * 2 - 1 z = Math.random() * 2 - 1 points.push v = vec4.fromValues x, y, z, 1 colors.push palette[if ρ < vec3.len v then 1 else 0] data = null zero = null do render = -> requestAnimationFrame render T = 1e-3 * Date.now() W = canvas.clientWidth H = canvas.clientHeight if W isnt canvas.width or H isnt canvas.height canvas.width = W canvas.height = H data = context.createImageData W, H zero = context.createImageData W, H zero.data[i] = 0xFF for i in [3...zero.data.length] by 4 data.data.set zero.data mat4.identity model mat4.rotateX model, model, T/5 mat4.rotateY model, model, T/6 mat4.rotateZ model, model, T/7 mat4.lookAt view, [0, 0, 3], [0, 0, 0], [0, 1, 0] mat4.perspective projection, 30 * Math.RAD, W/H, 1e-3, 1e3 [ model, view, projection ].reduce (a, b) -> mat4.mul mvp, b, a for point, i in points vec4.transformMat4 buffer, point, mvp vec3.scale buffer, buffer, 1/buffer[3] [ x, y, z, w ] = buffer if -1

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