基于three.js編寫的一個(gè)項(xiàng)目類示例代碼

 // VRcore.js
 import * as THREE from 'three';
 const OrbitControls = require('three-orbit-controls')(THREE)
 let Scene, Camera, Renderer, Controls, loopID;

 function createScene({domContainer = document.body, fov = 50,far = 1000}){
 if (!(domContainer instanceof HTMLElement)) {
 throw new Error('domContainer is not a HTMLElement!');
 }
 // 初始化 scene
 Scene = new THREE.Scene();
 // 初始化 camera
 Camera = new THREE.PerspectiveCamera(fov, domContainer.clientWidth / domContainer.clientHeight, 1, far);
 Camera.position.set( 200, 200, 200 );
 Camera.lookAt(Scene.position);
 Scene.add(Camera);
 // 初始化 renderer
 Renderer = new THREE.WebGLRenderer({ canvas: domContainer, antialias: true, alpha: true } );
 Renderer.clear();
 Renderer.setClearColor( 0xeeeeee, 1); // 更改渲染器顏色
 Renderer.setSize(domContainer.clientWidth, domContainer.clientHeight);
 Renderer.shadowMap.Enabled = true;
 Renderer.setPixelRatio(domContainer.devicePixelRatio);
 initVR();
 }
 function initVR() {
 // 初始化控制器
 Controls = new OrbitControls(Camera, Renderer.domElement);;
 Controls.addEventListener('change', render);
 Controls.enableZoom = true;
 }
 function render() {
 Renderer.render(Scene, Camera);
 }
 function renderStart(callback) {
 loopID = 0; // 記錄循環(huán)幾次，后面有與清除場景中的物體
 if (loopID === -1) return;
 let animate = function(){
 loopID = requestAnimationFrame(animate);
 callback();
 Controls.update();
 render();
 }
 animate();
 }
 // 暫停動(dòng)畫渲染
 function renderStop() {
 if (loopID !== -1) {
 window.cancelAnimationFrame(loopID);
 loopID = -1;
 }
 }
 // 回收當(dāng)前場景
 function clearScene() {
 for(let i = Scene.children.length - 1; i >= 0; i-- ) {
 Scene.remove(Scene.children[i]);
 }
 }
 // 清理頁面
 function cleanPage() {
 renderStop();
 clearScene();
 }
 export {
 Scene,
 Camera,
 Renderer,
 Controls,
 createScene,
 initVR,
 renderStart,
 renderStop,
 clearScene,
 cleanPage
 }

 // VRpage.js
 import * as THREE from 'three';
 import * as VRcore from './VRcore.js';
 export default class VRpage {
 constructor(options) {
 // 創(chuàng)建場景
 VRcore.createScene(options);
 this.start();
 this.loadPage();
 }
 loadPage() {
 VRcore.renderStart(() => this.update());
 this.loaded();
 }
 initPage() {
 this.loadPage();
 this.start();
 }
 start() {}
 loaded() {}
 update() {}
 }

 // page.js
 import * as THREE from 'three';
 import VRpage from '../../utils/VRpage.js';
 import * as VRcore from '../../utils/VRcore.js';
 export default class Page extends VRpage {
 start() { // 啟動(dòng)渲染之前，創(chuàng)建場景3d模型
 let geometry = new THREE.CubeGeometry(100,100,100);
 let material = new THREE.MeshLambertMaterial( { color:0x0000ff} );
 this.box = new THREE.Mesh(geometry,material);
 this.box.position.set(3, -2, -3);
 const PointLight = new THREE.PointLight(0xffffff);
 PointLight.position.set(500, 500, 500);
 const AmbientLight = new THREE.AmbientLight( 0x404040 ); // soft white light
 VRcore.Scene.add(PointLight);
 VRcore.Scene.add(AmbientLight);
 VRcore.Scene.background = new THREE.Color( 0xeeeeee ); // 更改場景背景色
 VRcore.Scene.add(this.box);
 }
 update() {
 this.box.rotation.y += 0.01;
 }
 }

 // index.js
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import Page from './Page.js';
 class Oho extends Component {
 constructor() {
 super();
 this.init = this.init.bind(this);
 }
 componentDidMount() {
 const dom = document.querySelector('#Oho');
 this.init(dom);
 }
 init(dom) {
 const page = new Page({domContainer: dom});
 }
 render() {
 return (
 <div className="three-demo">
 <canvas id="Oho" ref="camera"></canvas>
 </div>
 );
 }
 }
 export default Oho;