THREE.JS高级几何体车床模型THREE.LATHEGEOMETRY

<script src="/lib/three.js"></script>
<script src="/lib/js/utils/SceneUtils.js"></script>
<script src="/lib/js/QuickHull.js"></script>
<script src="/lib/js/geometries/ConvexGeometry.js"></script>
<script src="/lib/js/controls/OrbitControls.js"></script>
<script src="/lib/js/libs/stats.min.js"></script>
<script src="/lib/js/libs/dat.gui.min.js"></script>
<script>
    var renderer;
    function initRender() {
        renderer = new THREE.WebGLRenderer({antialias:true});
        renderer.setSize(window.innerWidth, window.innerHeight);
        document.body.appendChild(renderer.domElement);
    }

    var camera;
    function initCamera() {
        camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 1, 10000);
        camera.position.set(0, 0, 60);
    }

    var scene;
    function initScene() {
        scene = new THREE.Scene();
    }

    var light;
    function initLight() {
        scene.add(new THREE.AmbientLight(0x404040));

        light = new THREE.DirectionalLight(0xffffff);
        light.position.set(1,1,1);
        scene.add(light);
    }

    function initModel() {
        generatePoints(120, 2, 2 * Math.PI);
    }

    //生成模型调用的方法
    function generatePoints(segments, phiStart, phiLength) {
        // add 10 random spheres
        var points = []; //存储顶点位置的数组
        var height = 5;
        var count = 40;
        for (var i = 0; i < count; i++) {
            //将顶点坐标push进入数组
            points.push(new THREE.Vector3((Math.sin(i * 0.2) + Math.cos(i * 0.3)) * height + 12, ( i - count ) + count / 2, 0));
        }

        //创建一个存储顶点球体的对象
        spGroup = new THREE.Object3D();
        var material = new THREE.MeshBasicMaterial({color: 0xff0000, transparent: false}); //声明顶点球体使用的纹理
        points.forEach(function (point) {
            var spGeom = new THREE.SphereGeometry(0.2); //实例化球形几何体
            var spMesh = new THREE.Mesh(spGeom, material); //生成网格
            spMesh.position.copy(point); //将当前顶点的坐标位置赋值给当前球体
            spGroup.add(spMesh); //添加到对象当中
        });
        // 将存储顶点球体的对象添加到场景当中
        scene.add(spGroup);

        // 实例化一个THREE.LatheGeometry，并设置相关的信息
        var latheGeometry = new THREE.LatheGeometry(points, segments, phiStart, phiLength);
        latheMesh = createMesh(latheGeometry);

        scene.add(latheMesh);
    }

    function createMesh(geom) {

        //  实例化一个法向量的材质
        var meshMaterial = new THREE.MeshNormalMaterial();
        meshMaterial.side = THREE.DoubleSide; //设置两面都可见
        var wireFrameMat = new THREE.MeshBasicMaterial();
        wireFrameMat.wireframe = true; //把材质渲染成线框

        // 将两种材质都赋给几何体
        var mesh = THREE.SceneUtils.createMultiMaterialObject(geom, [meshMaterial, wireFrameMat]);

        return mesh;
    }

    //初始化性能插件
    var stats;
    function initStats() {
        stats = new Stats();
        document.body.appendChild(stats.dom);
    }

    //用户交互插件 鼠标左键按住旋转，右键按住平移，滚轮缩放
    var controls;
    function initControls() {

        controls = new THREE.OrbitControls( camera, renderer.domElement );

        // 如果使用animate方法时，将此函数删除
        //controls.addEventListener( 'change', render );
        // 使动画循环使用时阻尼或自转 意思是否有惯性
        controls.enableDamping = true;
        //动态阻尼系数 就是鼠标拖拽旋转灵敏度
        //controls.dampingFactor = 0.25;
        //是否可以缩放
        controls.enableZoom = true;
        //是否自动旋转
        controls.autoRotate = false;
        //设置相机距离原点的最远距离
        controls.minDistance  = 20;
        //设置相机距离原点的最远距离
        controls.maxDistance  = 160;
        //是否开启右键拖拽
        controls.enablePan = true;
    }

    function render() {
        renderer.render( scene, camera );
    }

    //窗口变动触发的函数
    function onWindowResize() {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        render();
        renderer.setSize( window.innerWidth, window.innerHeight );

    }

    function animate() {
        //更新控制器
        controls.update();
        render();

        //更新性能插件
        stats.update();
        requestAnimationFrame(animate);
    }

    function draw() {
        initRender();
        initScene();
        initCamera();
        initLight();
        initModel();
        initControls();
        initStats();

        animate();
        window.onresize = onWindowResize;
    }
</script>