【前端知识】Three 学习日志（七）—

【前端知识】Three 学习日志（七）—— 动画渲染循环

Three 学习日志（七）—— 动画渲染循环

一、旋转动画

// 渲染函数
function render() {renderer.render(scene, camera); //执行渲染操作mesh.rotateY(0.01);//每次绕y轴旋转0.01弧度requestAnimationFrame(render);//请求再次执行渲染函数render，渲染下一帧
}
render();

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二、计算两帧渲染时间间隔和帧率

// 渲染循环
const clock = new THREE.Clock();
const spt = clock.getDelta()*1000;//毫秒
console.log('两帧渲染时间间隔(毫秒)',spt);
console.log('帧率FPS',1000/spt);

在这里插入图片描述

三、完整代码

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Learn Three</title><!-- 引入three，下载地址参考：http://www.webgl3d.cn/pages/aac9ab/#%E7%89%B9%E5%AE%9A%E7%89%88%E6%9C%ACthree-js%E6%96%87%E4%BB%B6%E5%8C%85%E4%B8%8B%E8%BD%BD --><script src="../build/three.js"></script><!-- 引入相机控件 --><script type="importmap">{"imports": {"three": "../build/three.module.js","three/addons/": "../examples/jsm/"}}</script>
</head><body><script type="module">// 引入轨道控制器扩展库OrbitControls.jsimport { OrbitControls } from 'three/addons/controls/OrbitControls.js';// 创建3D场景对象Sceneconst scene = new THREE.Scene();const axesHelper = new THREE.AxesHelper(150);scene.add(axesHelper);const geometry = new THREE.BoxGeometry(100, 100, 100);const material = new THREE.MeshBasicMaterial({color: 0xff0000, //设置材质颜色transparent: true,//开启透明opacity: 0.5,//设置透明度});const mesh = new THREE.Mesh(geometry, material); //网格模型对象Meshmesh.position.set(0, 0, 0);scene.add(mesh);// //环境光强度调整为0.8const ambient = new THREE.AmbientLight(0xffffff, 0.4);scene.add(ambient);const camera = new THREE.PerspectiveCamera();camera.position.set(200, 200, 200);camera.lookAt(0, 0, 0);const width = 800; //宽度const height = 500; //高度const renderer = new THREE.WebGLRenderer();renderer.setSize(width, height);renderer.render(scene, camera); //执行渲染操作document.body.appendChild(renderer.domElement);// 渲染循环const clock = new THREE.Clock();function render() {const spt = clock.getDelta() * 1000;//毫秒console.log('两帧渲染时间间隔(毫秒)', spt);console.log('帧率FPS', 1000 / spt);renderer.render(scene, camera); //执行渲染操作mesh.rotateY(0.01);//每次绕y轴旋转0.01弧度requestAnimationFrame(render);//请求再次执行渲染函数render，渲染下一帧}render();</script>
</body></html>