3D机房系统是最近用户的需求,通过相关了解最后使用Three.js,也发现最近有东西可以写出来分享：

• webGL可以让我们在canvas上实现3D效果。而three.js是一款webGL框架，由于其易用性被广泛应用
• Three.js是通过对WebGL接口的封装与简化而形成的一个易用的图形库
  

分步实现3D效果

• 初始化3D模型参数
• 开始搭建场景
• 初始化渲染器
• 初始化摄像机
• 创建场景
• 灯光布置
• 创建网格线
• 循环渲染界面
• 创建鼠标控制器
• 添加对象到场景中
  

一 . 初始化3D模型参数

//参数处理 this.option = new Object(); this.option.antialias = option.antialias || true; this.option.clearCoolr = option.clearCoolr || 0x1b7ace; this.option.showHelpGrid = option.showHelpGrid || false; //对象 this.id = id; this.width = width(); this.height = height(); this.renderer = null;//渲染器 this.scene = null;//场景 this.camera = null;//摄像机 this.selected=null; this.objects = []; this.mouseClick = new THREE.Vector2(); this.raycaster = new THREE.Raycaster(); this.controls = null;//鼠标控制器 this.trsnaformControls = null;//鼠标控制器 this.dragcontrols = null; this.objList = json.objects;//对象列表 this.eventList = json.events;//事件对象列表 this.dragList = []; this.objectStatusList = {}; this.clickList = []; var that = this;

对于一些需要使用的参数,开始加载进行初始化操作。

二 . 开始搭建场景

搭建场景包含一些具体的初始化操作　一些初始化方法(之后才对具体方法加以说明)：

var that = this; room3dObj = that; that.initThree(that.id); //初始化渲染器 that.initCamera(); //初始化摄像机 that.initScene();//创建场景 that.initHelpGrid();//创建网格 that.initLight();//灯光布置 //添加3D对象 $.each(that.objList, function (index,obj) { that.InitAddObject(obj);//添加对象到场景中 }); that.initMouseCtrl();//创建鼠标控制器 that.animation();//循环渲染界面

三 . 初始化渲染器

渲染器 WebGLRenderer　定义语法：

var that = this; that.renderer = new THREE.WebGLRenderer({ alpha: true, antialias: that.option.antialias }); that.renderer.setSize(that.width, that.height); $(“#” + that.id).append(that.renderer.domElement); that.renderer.setClearColor(that.option.clearCoolr, 1.0); that.renderer.shadowMap.enabled = true; that.renderer.shadowMapSoft = true; //事件 that.renderer.domElement.addEventListener(‘mousedown',that.onDocumentMouseDown, false); that.renderer.domElement.addEventListener(‘mousemove',that.onDocumentMouseMove, false);

四 . 初始化摄像机

采用PerspectiveCamera 相机：

var that = this; that.camera = new THREE.PerspectiveCamera(45, that.width / that.height, 1, 100000); that.camera.name = 'mainCamera'; that.camera.position.x =0; that.camera.position.y =2000; that.camera.position.z =1800; that.camera.up.x = 0; that.camera.up.y =1; that.camera.up.z =0; that.camera.lookAt({ x: 100, y: 0, z: 100 }); that.objects.push(that.camera); that.dragList.push(that.camera); that.clickList.push(that.camera);

五 . 创建场景

var that = this; that.scene = new THREE.Scene();

六 . 灯光布置

var that = this; var light = new THREE.AmbientLight(0xcccccc); light.position.set(0, 0,0); that.scene.add(light); var light2 = new THREE.PointLight(0x555555); light2.shadow.camera.near =1; light2.shadow.camera.far = 5000; light2.position.set(0, 350, 0); light2.castShadow = true;//表示这个光是可以产生阴影的 that.scene.add(light2);

七 . 创建网格

var that = this; if (that.option.showHelpGrid) { var helpGrid = new THREE.GridHelper(1000, 50); that.scene.add(helpGrid); }

八 . 循环渲染界面

var that = room3dObj; if (TWEEN != null && typeof (TWEEN) != ‘undefined') { TWEEN.update(); } requestAnimationFrame(that.animation); that.renderer.render(that.scene, that.camera);

九 . 创建鼠标控制器

var that = this; that.controls = new THREE.OrbitControls(that.camera,that.renderer.domElement); that.controls.addEventListener(‘change', that.updateControls);

十 . 添加对象到场景中

var that = room3dObj; that.scene.add(obj); that.objects.push(obj);

最后效果

浏览器兼容

• 目前，本编辑器对Chrome浏览器支持最为完整。建议大家使用较新版本的Chrome.
• IE11以下不支持
  

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