three.js 模型居中用计算坐标的方式

代码：
<!DOCTYPE html>
<html lang="en">
<head>
    <title>three.js webgl - loaders - 3DS loader</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    <link type="text/css" rel="stylesheet" href="/three.js/main.css">
</head>

<body>
   
    <script type="module">

        //注意：
        //TrackballControls.js 和 TDSLoader.js 都引用了 three.module.js，特别注意引用的路径

        import * as THREE from '/three.js/build/three.module.js';
        import { TrackballControls } from '/three.js/jsm/controls/TrackballControls.js';

        var container, controls;
        var camera, scene, renderer;
        init();
        animate();


        function resize() {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
        }

        function animate() {
            controls.update();
            renderer.render(scene, camera);
            requestAnimationFrame(animate);
        }

        function init() {
            container = document.createElement('div');
            document.body.appendChild(container);
            camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);//
            camera.position.z = 20;
            camera.position.x = 20;
            scene = new THREE.Scene();

            var axis = new THREE.AxisHelper(3);//显示三维坐标系
            scene.add(axis);

            var ambient = new THREE.AmbientLight(0xffffff);//环境光
            scene.add(ambient);

            var geometry = new THREE.BoxBufferGeometry(1, 1, 1);//形状
            var material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });//材质
            var mesh = new THREE.Mesh(geometry, material);//创建网格：网格 = 形状 + 材质
            mesh.position.set(2, -2, 2);//设置网格的位置
            scene.add(mesh);//将网格添加到场景



            //模型居中
            alert('3秒后模型自动居中！');
            setTimeout(function () {
                mesh.geometry.computeBoundingBox();
                var box = mesh.geometry.boundingBox.clone();

                var mdlen = box.max.x - box.min.x;
                var mdwid = box.max.z - box.min.z;
                var mdhei = box.max.y - box.min.y;
                var centerpoint = new THREE.Vector3();
                var x1 = box.min.x + mdlen / 2;
                var y1 = box.min.y + mdhei / 2;
                var z1 = box.min.z + mdwid / 2;

                mesh.position.set(-x1, -y1, -z1);
            }, 3000);



            renderer = new THREE.WebGLRenderer();
            renderer.setPixelRatio(window.devicePixelRatio);
            renderer.setSize(window.innerWidth, window.innerHeight);
            container.appendChild(renderer.domElement);
            controls = new TrackballControls(camera, renderer.domElement);
            window.addEventListener('resize', resize, false);
        }

    </script>

</body>
</html>
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three.js 模型居中 用计算坐标的方式

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