<!DOCTYPE html><html><head> ???<title></title> ???<script src="https://cdn.bootcss.com/three.js/r67/three.js"></script> ???<script src="https://cdn.bootcss.com/stats.js/r10/Stats.min.js"></script> ???<script type="text/javascript" src="https://cdn.bootcss.com/dat-gui/0.7.3/dat.gui.js"></script> ???<style> ???????body { ???????????margin: 0; ???????????overflow: hidden; ???????} ???</style></head><body><div id="Stats-output"></div><div id="WebGL-output"></div><script type="text/javascript"> ???// 初始化 ???function init() { ???????var stats = initStats(); ???????// 创建一个场景 ???????var scene = new THREE.Scene(); ???????// 创建一个相机 ???????var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000); ???????camera.position.x = 120; ???????camera.position.y = 60; ???????camera.position.z = 180; ???????// 创建渲染器 ???????var renderer = new THREE.WebGLRenderer(); ???????renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0)); ???????renderer.setSize(window.innerWidth, window.innerHeight); ???????// 创建地面 ???????var planeGeometry = new THREE.PlaneGeometry(180, 180); ???????var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffffff}); ???????var plane = new THREE.Mesh(planeGeometry, planeMaterial); ???????// 地面保持水平 ???????plane.rotation.x = -0.5 * Math.PI; ???????plane.position.x = 0; ???????plane.position.y = 0; ???????plane.position.z = 0; ???????// 地面添加到场景中去 ???????scene.add(plane); ???????var cubeGeometry = new THREE.BoxGeometry(4, 4, 4); ???????for (var j = 0; j < (planeGeometry.parameters.height / 5); j++) { ???????????for (var i = 0; i < planeGeometry.parameters.width / 5; i++) { ???????????????var rnd = Math.random() * 0.75 + 0.25; ???????????????var cubeMaterial = new THREE.MeshLambertMaterial(); ???????????????cubeMaterial.color = new THREE.Color(rnd, 0, 0); ???????????????var cube = new THREE.Mesh(cubeGeometry, cubeMaterial); ???????????????cube.position.z = -((planeGeometry.parameters.height) / 2) + 2 + (j * 5); ???????????????cube.position.x = -((planeGeometry.parameters.width) / 2) + 2 + (i * 5); ???????????????cube.position.y = 2; ???????????????scene.add(cube); ???????????} ???????} ???????var directionalLight = new THREE.DirectionalLight(0xffffff, 0.7); ???????directionalLight.position.set(-20, 40, 60); ???????scene.add(directionalLight); ???????// 添加自然光 ???????var ambientLight = new THREE.AmbientLight(0x292929); ???????scene.add(ambientLight); ???????// 添加场景到DOM元素中去 ???????document.getElementById("WebGL-output").appendChild(renderer.domElement); ???????????????var step = 0; ???????//perspective透视摄像机 和 ??orthographic正交摄像机 替换函数 ???????var controls = new function () { ???????????this.perspective = "Perspective"; ???????????this.switchCamera = function () { ???????????????if (camera instanceof THREE.PerspectiveCamera) { ???????????????????camera = new THREE.OrthographicCamera(window.innerWidth / -16, window.innerWidth / 16, window.innerHeight / 16, window.innerHeight / -16, -200, 500); ???????????????????camera.position.x = 120; ???????????????????camera.position.y = 60; ???????????????????camera.position.z = 180; ???????????????????camera.lookAt(scene.position); ???????????????????this.perspective = "Orthographic"; ???????????????} else { ???????????????????camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000); ???????????????????camera.position.x = 120; ???????????????????camera.position.y = 60; ???????????????????camera.position.z = 180; ???????????????????camera.lookAt(scene.position); ???????????????????this.perspective = "Perspective"; ???????????????} ???????????}; ???????}; ???????var gui = new dat.GUI(); ???????gui.add(controls, ‘switchCamera‘); ???????gui.add(controls, ‘perspective‘).listen(); ?????????????????//相机看向场景 ???????camera.lookAt(scene.position); ???????render(); ???????function render() { ???????????stats.update(); ???????????????????????requestAnimationFrame(render); ???????????renderer.render(scene, camera); ???????} ???????function initStats() { ???????????var stats = new Stats(); ???????????stats.setMode(0); // 0: fps, 1: ms ???????????stats.domElement.style.position = ‘absolute‘; ???????????stats.domElement.style.left = ‘0px‘; ???????????stats.domElement.style.top = ‘0px‘; ???????????document.getElementById("Stats-output").appendChild(stats.domElement); ???????????return stats; ???????} ???} ???window.onload = init</script></body></html>对于这两个相机官方有一个示例更容易让人理解
https://threejs.org/examples/#webgl_camera
按O和P两个按钮切换相机
10-THREE.JS perspective透视摄像机和orthographic正交摄像机区别
原文地址：https://www.cnblogs.com/shuaihan/p/9875369.html