本文主要介绍了three.js 入门案例详解，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧，希望能帮助到大家。
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
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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,
};
}
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