three.js 入门案例详解

最近公司需要用tree.js实现一个3D图的显示，就看了官方文档，正好有时间，就记录下来。由

最近公司需要用tree.js实现一个3D图的显示，就看了官方文档，正好有时间，就记录下来。

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);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。