学习threejs，模拟窗户光源

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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

本文详细介绍如何基于threejs在三维场景中模拟窗户光源，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，设置相机方向camera.lookAt
4、初始化THREE.AmbientLight环境光源，scene场景加入环境光源，初始化THREE.RectAreaLight窗户光源，设置窗户光源位置，设置窗户光源方向，scene添加窗户光源
5、初始化gui工具，定义控制灯光和投影的函数
6、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。
7、加入controls、gui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>learn16(模拟窗户光源)</title><script src="lib/threejs/127/three.js-master/build/three.js"></script><script src="lib/threejs/127/three.js-master/examples/js/lights/RectAreaLightUniformsLib.js"></script><script src="lib/threejs/127/three.js-master/examples/jsm/helpers/RectAreaLightHelper.js"></script><script src="lib/threejs/127/three.js-master/examples/js/controls/OrbitControls.js"></script><script src="lib/threejs/127/three.js-master/examples/js/libs/stats.min.js"></script><script src="lib/threejs/127/three.js-master/examples/js/libs/dat.gui.min.js"></script>
</head>
<style>body {margin: 0;}canvas {width: 100%;height: 100%;display: block;}
</style>
<body onload="draw()">
</body>
<script>var renderervar initRender = () => {renderer = new THREE.WebGLRenderer({antialias: true})renderer.shadowMap.enabled = truerenderer.shadowMap.type = THREE.PCFSoftShadowMaprenderer.setSize(window.innerWidth, window.innerHeight)document.body.appendChild(renderer.domElement)}var scenevar initScene = () => {scene = new THREE.Scene()}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 statsvar initStats = () => {stats = new Stats()document.body.appendChild(stats.dom)}var controlsvar initControls = () => {controls = new THREE.OrbitControls(camera, renderer.domElement)controls.enableDamping = true}var rectLight, rectLightHelpervar initLight = () => {var ambientLight = new THREE.AmbientLight(0x111111)scene.add(ambientLight)rectLight = new THREE.RectAreaLight(0xffffff, 500, 10, 10)rectLight.position.set(5, 10, -20)rectLight.lookAt( 0, 0, 0 )scene.add(rectLight)// rectLightHelper = new THREE.RectAreaLightHelper(rectLight)// scene.add(rectLightHelper)}var cube, sphere, planevar initModel = () => {var helper = new THREE.AxisHelper(10)scene.add(helper)var sphereGeometry = new THREE.SphereGeometry(10, 30, 30)var sphereMaterial = new THREE.MeshStandardMaterial({color: 0xff00ff})sphere = new THREE.Mesh(sphereGeometry, sphereMaterial)sphere.position.set(-20, 20, 0)sphere.castShadow = truescene.add(sphere)var cubeGeometry = new THREE.BoxGeometry(10, 10, 10)var cubeMaterial = new THREE.MeshLambertMaterial({color: 0x00ffff})cube = new THREE.Mesh(cubeGeometry, cubeMaterial)cube.position.set(30, 5, -5)cube.castShadow = truescene.add(cube)var planeGeometry = new THREE.PlaneGeometry(5000, 5000, 20, 20)var planeMaterial = new THREE.MeshLambertMaterial({color: 0xaaaaaa})plane = new THREE.Mesh(planeGeometry, planeMaterial)plane.rotation.x = -0.5 * Math.PIplane.position.y = -0plane.receiveShadow = truescene.add(plane)}var guivar initGui = () => {gui = {motion: true,width: rectLight.width,height: rectLight.height,color: rectLight.color.getHex(),intensity: rectLight.intensity}var datGui = new dat.GUI()datGui.add(gui, 'width', 0.1, 100).onChange(e => {rectLight.width = e})datGui.add(gui, 'height', 0.1, 100).onChange(e => {rectLight.height = e})datGui.addColor(gui, 'color').onChange(e => {rectLight.color.setHex(e)})datGui.add(gui, 'intensity', 0, 1000).onChange(e => {rectLight.intensity = e})datGui.open()}var render = () => {// rectLightHelper.update()renderer.render(scene, camera)}var onWindowResize = () => {camera.aspect = window.innerWidth/window.innerHeightcamera.updateProjectionMatrix()render()renderer.setSize(window.innerWidth, window.innerHeight)}var animate = () => {render()stats.update()controls.update()requestAnimationFrame(animate)}var draw = () => {initRender()initScene()initCamera()initLight()initModel()initControls()initStats()initGui()animate()window.onresize = onWindowResize}
</script>
</html>