//新建一个场景对象
var scene = new Scene();

//新建一个相机
var width = window.innerWidth; //窗口宽度
var height = window.innerHeight; //窗口高度
var k = width / height; //窗口宽高比
var s = 200; //三维场景显示范围控制系数，系数越大，显示的范围越大
//创建相机对象
var camera = new THREE.OrthographicCamera(-s * k, s * k, s, -s, 1, 1000);
camera.position.set(200, 300, 200); //设置相机位置
camera.lookAt(scene.position); //设置相机方向(指向的场景对象)

//新建渲染器
var renderer = new THREE.WebGLRenderer();
renderer.setSize(width, height);//设置渲染区域尺寸
renderer.setClearColor(0xb9d3ff, 1); //设置背景颜色

function render() {

    let T1 = new Date();

    let t = T1 - T0;
    T0 = T1;
    renderer.render(scene, camera);//执行渲染操作

    mesh.rotateY(0.0005 * t);//每次绕y轴旋转0.01弧度
    requestAnimationFrame(render);//请求再次执行渲染函数render

}
render();

var controls = new THREE.OrbitControls(camera, renderer.domElement);//创建控件对象

//  
//controls.addEventListener('change', render);//监听鼠标、键盘事件

//长方体 参数：长，宽，高
var geometry = new THREE.BoxGeometry(100, 100, 100);
// 球体 参数：半径60  经纬度细分数40,40
var geometry = new THREE.SphereGeometry(60, 40, 40);
// 圆柱  参数：圆柱面顶部、底部直径50,50   高度100  圆周分段数
var geometry = new THREE.CylinderGeometry( 50, 50, 100, 25 );
// 正八面体
var geometry = new THREE.OctahedronGeometry(50);
// 正十二面体
var geometry = new THREE.DodecahedronGeometry(50);
// 正二十面体
var geometry = new THREE.IcosahedronGeometry(50);

var material = new THREE.MeshLambertMaterial({
    color: 0x0000ff
}); //材质对象Material
var mesh = new THREE.Mesh(geometry, material); //网格模型对象Mesh
scene.add(mesh); //网格模型添加到场景中

var axisHelper = new THREE.AxisHelper(350);
scene.add(axisHelper)