Created
August 15, 2014 06:31
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[javascript][threejs] sphere spiral
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r68/three.min.js" | |
| ></script> | |
| <script src="https://rawgit.com/mrdoob/three.js/master/examples/js/controls/Trac | |
| kballControls.js" | |
| ></script> | |
| <script src="spiral.js"></script> | |
| </head> | |
| <body><div id="view"></div></body> | |
| </html> |
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| window.addEventListener("load", function () { | |
| "use strict"; | |
| var w = 800, h = 800; | |
| var renderer = new THREE.WebGLRenderer(); | |
| renderer.setSize(w, h); | |
| var view = document.getElementById("view"); | |
| view.appendChild(renderer.domElement); | |
| var camera = new THREE.PerspectiveCamera(45, w / h, 1, 1000); | |
| camera.position.set(50, 50, 50); | |
| var controls = new THREE.TrackballControls(camera, view); | |
| var scene = new THREE.Scene(); | |
| scene.add(new THREE.AmbientLight(0x333333)); | |
| var obj = new THREE.Line( | |
| new THREE.Geometry(), new THREE.LineBasicMaterial({color: 0x339900})); | |
| obj.geometry.dynamic = true; | |
| scene.add(obj); | |
| // ES6 Math polyfill | |
| var tanh = Math.tanh || function tanh(x) { | |
| return (Math.exp(x) - Math.exp(-x)) / (Math.exp(x) + Math.exp(-x)); | |
| }; | |
| var cosh = Math.cosh || function cosh(x) { | |
| return (Math.exp(x) + Math.exp(-x)) / 2; | |
| }; | |
| var sinh = Math.sinh || function sinh(x) { | |
| return (Math.exp(x) - Math.exp(-x)) / 2; | |
| }; | |
| // sphere spiral | |
| var sz = 16, cxy = 100, cz = cxy * sz; | |
| var hxy = Math.PI / cxy, hz = Math.PI / cz; | |
| var r = 20; | |
| for (var i = -cz; i < cz; i++) { | |
| var lxy = i * hxy; | |
| var lz = i * hz; | |
| var rxy = r / cosh(lz); | |
| var x = rxy * Math.cos(lxy); | |
| var y = rxy * Math.sin(lxy); | |
| var z = r * tanh(lz); | |
| obj.geometry.vertices.push(new THREE.Vector3(x, y, z)); | |
| } | |
| var loop = function loop() { | |
| requestAnimationFrame(loop); | |
| obj.rotation.z += 0.05; | |
| controls.update(); | |
| renderer.clear(); | |
| renderer.render(scene, camera); | |
| }; | |
| loop(); | |
| }, false); |
hey bellbind,
Would please add description to those sinh, cosh and tanh function and to some tricky statements ?
Good Work Though.
black screen !
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demo: https://rawgit.com/bellbind/c9d885349db114d98734/raw/spiral.html