学习threejs，实现几何体阴影效果

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👨‍⚕️ 收录于专栏：threejs gis工程师

文章目录

一、🍀前言
二、🍀绘制任意字体模型
- 1. ☘️实现思路
- 2. ☘️代码样例

一、🍀前言

本文详细介绍基于threejs如何绘制任意文字模型，亲测可用。希望能帮助到您。一起学习，加油！加油！

二、🍀绘制任意字体模型

1. ☘️实现思路

1、初始化renderer渲染器
2、初始化Scene三维场景
3、初始化camera相机，定义相机位置 camera.position.set
4、初始化light灯光，定义灯光位置，开启light.castShadow灯光阴影，Scene场景加入灯光
5、加载几何模型：创建SphereGeometry球体、BoxGeometry立方体、PlaneGeometry地面几何体以及AxisHelper辅助工具坐标系，Scene场景加入以上几何体和工具。
6、加入controls控制，加入stats监控器，监控帧数信息

2. ☘️代码样例

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>learn9(实现阴影效果)</title><script src="lib/threejs/127/three.js-master/build/three.js"></script><script src="lib/threejs/127/three.js-master/examples/js/controls/TrackballControls.js"></script><script src="lib/threejs/127/three.js-master/examples/js/libs/stats.min.js"></script>
</head>
<style>body {margin: 0;}canvas {width: 100%;height: 100%;display: block;}
</style>
<body onload="draw()"></body>
<script>var renderervar initRender = () => {// 抗锯齿renderer = new THREE.WebGLRenderer({antialias: true})renderer.setSize(window.innerWidth, window.innerHeight)renderer.shadowMap.enabled = true// 默认的是，没有设置的这个清晰 THREE.PCFShadowMaprenderer.shadowMap.type = THREE.PCFSoftShadowMapdocument.body.appendChild(renderer.domElement)}var cameravar initCamera = () => {camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000)camera.position.set(0, 40, 100)camera.lookAt(new THREE.Vector3(0, 0, 0))}var scenevar initScene = () => {scene = new THREE.Scene()// scene.fog = new THREE.FogExp2(0xffffff,0.02)scene.fog = new THREE.Fog(0xffffff, 100, 120)}var lightvar initLight = () => {scene.add(new THREE.AmbientLight(0x444444))light = new THREE.SpotLight(0xffffff)light.position.set(60, 30, 0)//告诉平行光需要开启阴影投射light.castShadow = truescene.add(light)}var initModel = () => {// 球var sphereGemometry = new THREE.SphereGeometry(5, 20, 20)var sphereMatarial = new THREE.MeshStandardMaterial({color: 0x7777ff})var sphere = new THREE.Mesh(sphereGemometry, sphereMatarial)sphere.position.set(0, 5, 0)sphere.castShadow = truescene.add(sphere)//辅助工具var helper = new THREE.AxisHelper(10)scene.add(helper)//立方体var cubeGeometry = new THREE.BoxGeometry(10, 10, 8)var cubeMaterial = new THREE.MeshLambertMaterial({color: 0x00ffff})var cube = new THREE.Mesh(cubeGeometry, cubeMaterial)cube.position.x = 25cube.position.y = 5cube.position.z = -5//告诉立方体需要投射阴影cube.castShadow = truescene.add(cube)// 底面var planeGeometry = new THREE.PlaneGeometry(100, 100)var planeMatarial = new THREE.MeshStandardMaterial({color: 0xaaaaaa})var plane = new THREE.Mesh(planeGeometry, planeMatarial)plane.rotation.x = -0.5 * Math.PIplane.position.y = -0plane.receiveShadow = truescene.add(plane)}var statsvar initStats = () => {stats = new Stats()document.body.appendChild(stats.dom)}var controlsvar initControle = () => {controls = new THREE.TrackballControls(camera, renderer.domElement)controls.addEventListener('change', render)}var render = () => {renderer.render(scene, camera)}var onWindwosResize = () => {camera.aspect = window.innerWidth / window.innerHeightcamera.updateProjectionMatrix()controls.handleResize()render()renderer.setSize(window.innerWidth, window.innerHeight)}var animate = () => {render()stats.update()controls.update()requestAnimationFrame(animate)}var draw = () => {initRender()initScene()initCamera()initLight()initModel()initControle()initStats()animate()window.onresize = onWindwosResize}</script>
</html>