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<!-- 来自 learning three.js -->
<script src="https://unpkg.com/three"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>
* {
margin: 0;
padding: 0;
}
html,
body {
height: 100%;
overflow: hidden;
}
function init() {
// 获取浏览器窗口的宽高,后续会用
var width = window.innerWidth
var height = window.innerHeight
// 创建一个场景
var scene = new THREE.Scene()
// 创建一个具有透视效果的摄像机
var camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 800)
// 设置摄像机位置,并将其朝向场景中心
camera.position.x = 0
camera.position.y = 10
camera.position.z = 200
camera.lookAt(scene.position)
// 创建一个 WebGL 渲染器,Three.js 还提供 <canvas>, <svg>, CSS3D 渲染器。
var renderer = new THREE.WebGLRenderer({
antialias: true // 开启抗齿锯
})
// 设置渲染器的清除颜色(即绘制下一帧前填充的颜色)和输出的 canvas 的尺寸
renderer.setClearColor(0x000000)
renderer.setSize(width, height)
// 将渲染器的输出(此处是 canvas 元素)插入到 body
document.body.appendChild(renderer.domElement)
// 初始化摄像机插件(用于拖拽旋转摄像机,产生交互效果)
var orbitControls = new THREE.OrbitControls(camera)
orbitControls.autoRotate = true
// 通过自定义 canvas 生成纹理
var getTexture = function () {
var canvas = document.createElement('canvas')
canvas.width = 32
canvas.height = 32
var ctx = canvas.getContext('2d')
// the body
ctx.translate(-81, -84)
ctx.fillStyle = "orange"
ctx.beginPath()
ctx.moveTo(83, 116)
ctx.lineTo(83, 102)
ctx.bezierCurveTo(83, 94, 89, 88, 97, 88)
ctx.bezierCurveTo(105, 88, 111, 94, 111, 102)
ctx.lineTo(111, 116)
ctx.lineTo(106.333, 111.333)
ctx.lineTo(101.666, 116)
ctx.lineTo(97, 111.333)
ctx.lineTo(92.333, 116)
ctx.lineTo(87.666, 111.333)
ctx.lineTo(83, 116)
ctx.fill()
// the eyes
ctx.fillStyle = "white"
ctx.beginPath()
ctx.moveTo(91, 96)
ctx.bezierCurveTo(88, 96, 87, 99, 87, 101)
ctx.bezierCurveTo(87, 103, 88, 106, 91, 106)
ctx.bezierCurveTo(94, 106, 95, 103, 95, 101)
ctx.bezierCurveTo(95, 99, 94, 96, 91, 96)
ctx.moveTo(103, 96)
ctx.bezierCurveTo(100, 96, 99, 99, 99, 101)
ctx.bezierCurveTo(99, 103, 100, 106, 103, 106)
ctx.bezierCurveTo(106, 106, 107, 103, 107, 101)
ctx.bezierCurveTo(107, 99, 106, 96, 103, 96)
ctx.fill()
// the pupils
ctx.fillStyle = "blue"
ctx.beginPath()
ctx.arc(101, 102, 2, 0, Math.PI * 2, true)
ctx.fill()
ctx.beginPath()
ctx.arc(89, 102, 2, 0, Math.PI * 2, true)
ctx.fill()
var texture = new THREE.Texture(canvas)
texture.needsUpdate = true
return texture
}
var geometry = new THREE.Geometry()
var material = new THREE.PointsMaterial({
size: 10,
transparent: true,
opacity: 1,
// 指定纹理
map: getTexture(),
// 粒子的大小是否和其与摄像机的距离有光,默认值 true
sizeAttenuation: true,
// 用于去除纹理的黑色背景,关于 depthTest 和 depthWrite 的详细解释,请查看https://stackoverflow.com/questions/37647853/three-js-depthwrite-vs-depthtest-for-transparent-canvas-texture-map-on-three-p
depthWrite: false
})
var range = 500
for (var i = 0; i < 5000; i++) {
var particle = new THREE.Vector3(
Math.random() * range - range / 2,
Math.random() * range - range / 2,
Math.random() * range - range / 2)
geometry.vertices.push(particle)
}
var points = new THREE.Points(geometry, material)
console.log(points)
scene.add(points)
render()
var step = 0
function render() {
// 渲染,即摄像机拍下此刻的场景
renderer.render(scene, camera)
step += 0.001;
points.rotation.x = step;
points.rotation.z = step;
requestAnimationFrame(render)
}
}
init()
Also see: Tab Triggers