【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

javascript 复制代码

// 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();

二、计算两帧渲染时间间隔和帧率

javascript 复制代码

// 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);

三、完整代码

html 复制代码

<!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.js
        import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
        // 创建3D场景对象Scene
        const 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Mesh
        mesh.position.set(0, 0, 0);
        scene.add(mesh);

        // //环境光强度调整为0.8
        const 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>