<!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
原文地址：https://www.cnblogs.com/shuaihan/p/9875369.html
时间： 2024-08-28 22:38:24