three.js 入门案例详解

由于我们公司的前端框架用的是angular，所以我就把我的treejs封装在一个directives里面。后面放源码

首先我们要知道three.js的下载地址它的地址是： https://github.com/mrdoob/three.js。

其次，什么是three.js？

three.js的几个步骤：

1：引入three.js文件（打开调试窗口，并在Console下输入 THREE.REVISION命令，得到版本号，成功）

2：设置一个场景// var scene = new THREE. Scene();

3： var camera = new THREE. PerspectiveCamera( 75, window.innerWidth /window.innerHeight, 0.1, 1000)；设置一个 透视相机
4： var renderer = new THREE. WebGLRenderer();   renderer. setSize(window.innerWidth, window.innerHeight); 设置一个渲染器

5：把一个物体添加到场景中

modelUrl是所添加文件例如：$scope. DView = cy3DView. newCanvas ; $scope. DView. config( 'canvas')

$scope.process3DUrl = data.result.data.engineering_stl_mcube; $scope.DView.plan($scope.process3DUrl) function plan(modelUrl) { stlLoader = new THREE.STLLoader(); group = new THREE.Object3D(); stlLoader.load(modelUrl, function (geometry) { //console.log(geometry); var mat = new THREE.MeshLambertMaterial({color: 0x7777ff}); group = new THREE.Mesh(geometry, mat); group.rotation.x = -0.5 * Math.PI; group.scale.set(0.6, 0.6, 0.6); scene.add(group); animation(); }); }

6：渲染

renderer.render(scene, camera);

ok 是不是很简单，个人认为是这样，没有看懂的小伙伴可以私信我哦

源码如下：

(function(window, document) { 'use strict'; var three = window.THREE; var angular = window.angular; angular.module('cy-3D-view', []).factory('cy3DView', cy3DView); cy3DView.$inject = ['$rootScope']; function cy3DView($rootScope) { return { newCanvas: new Object(newCanvas($rootScope)) }; } function newCanvas() { var scene, camera, renderer, controls, group, ambient, fov, near, far, stlLoader; var width, height, keyLight, fillLight, backLight, spotLight, lighting; function config() { //设置3D图的宽和高 width = document.getElementById('canvas').clientWidth; height = document.getElementById('canvas').clientHeight; renderer = new THREE.WebGLRenderer({ antialias: true }); renderer.setSize(width, height); renderer.shadowMapEnabled = true;　 document.getElementById('canvas').appendChild(renderer.domElement); renderer.setClearColor(0xFFFFFF, 1.0); scene = new THREE.Scene(); lighting = false; //设置3D图的颜色 ambient = new THREE.AmbientLight(0xffffff, 1.0); scene.add(ambient); keyLight = new THREE.DirectionalLight(new THREE.Color('hsl(30, 100%, 75%)'), 1.0); keyLight.position.set( - 100, 0, 100); fillLight = new THREE.DirectionalLight(new THREE.Color('hsl(240, 100%, 75%)'), 0.75); fillLight.position.set(100, 0, 100); backLight = new THREE.DirectionalLight(0xffffff, 1.0); backLight.position.set(100, 0, -100).normalize(); spotLight = new THREE.SpotLight(0xffffff); spotLight.position.set(150, 150, 150); scene.add(spotLight); //照相机配置 fov = 40; near = 1; far = 1000; camera = new THREE.PerspectiveCamera(fov, width / height, near, far); camera.position.x = 150; camera.position.y = 150; camera.position.z = 150; camera.lookAt({ x: 0, y: 0, z: 0 }); camera.lookAt(new THREE.Vector3(0, 40, 0)); controls = new THREE.OrbitControls(camera, renderer.domElement); controls.enableDamping = true; controls.dampingFactor = 0.25; controls.enableZoom = false; window.addEventListener('resize', onWindowResize, false); window.addEventListener('keydown', onKeyboardEvent, false); window.addEventListener('mousewheel', mousewheel, false); } function mousewheel(e) { e.preventDefault(); if (e.wheelDelta) { //判断浏览器IE，谷歌滑轮事件 if (e.wheelDelta > 0) { //当滑轮向上滚动时 fov -= (near < fov ? 1 : 0); } if (e.wheelDelta < 0) { //当滑轮向下滚动时 fov += (fov < far ? 1 : 0); } } else if (e.detail) { //Firefox滑轮事件 if (e.detail > 0) { //当滑轮向上滚动时 fov -= 1; } if (e.detail < 0) { //当滑轮向下滚动时 fov += 1; } } camera.fov = fov; camera.updateProjectionMatrix(); renderer.render(scene, camera); } function onWindowResize() { camera.aspect = width / height; camera.updateProjectionMatrix(); renderer.setSize(width, height); } function onKeyboardEvent(e) { if (e.code === 'KeyL') { lighting = !lighting; if (lighting) { ambient.intensity = 0.25; scene.add(keyLight); scene.add(fillLight); scene.add(backLight); } else { ambient.intensity = 1.0; scene.remove(keyLight); scene.remove(fillLight); scene.remove(backLight); } } } function plan(modelUrl) { stlLoader = new THREE.STLLoader(); group = new THREE.Object3D(); stlLoader.load(modelUrl, function(geometry) { //console.log(geometry); var mat = new THREE.MeshLambertMaterial({ color: 0x7777ff }); group = new THREE.Mesh(geometry, mat); group.rotation.x = -0.5 * Math.PI; group.scale.set(0.6, 0.6, 0.6); scene.add(group); animation(); }); } function animation() { renderer.render(scene, camera); requestAnimationFrame(animation); } return { config: config, plan: plan, }; } })(window, document);