初始化三维场景

function init() {

    container = document.getElementById('container');

    camera = new THREE.PerspectiveCamera(65, window.innerWidth / window.innerHeight, 0.1, 150000000);
    camera.position.set(550, 600, 690);

    scene = new THREE.Scene();
    // scene.background = new THREE.Color(0x426ab3);
    scene.background = new THREE.Color(0x0);

    renderer = new THREE.WebGLRenderer({
        //logarithmicDepthBuffer: true,  // 使用精度更高的z缓冲
        antialias: true,  // 设置抗锯齿，
        alpha: true       // 是否可以设置背景色透明。必须设置为true，才能出现镜头光晕效果
    });
    renderer.setPixelRatio(window.devicePixelRatio);
    renderer.setSize(window.innerWidth, window.innerHeight);
    container.appendChild(renderer.domElement);

    // const light = new THREE.HemisphereLight(0xffffff, 0x909090, 0.8);
    // scene.add(light);
    const light = new THREE.AmbientLight( 0xffffff,1 ); // soft white light
    scene.add( light );

    const directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
    directionalLight.position.set(550, 4600, 690);
    scene.add(directionalLight);

    const light2 = new THREE.PointLight( 0xffffff, 0.25 );
    light2.position.set( 1550, 3500, 0 );
    scene.add( light2 );

    controls = new THREE.OrbitControls(camera, renderer.domElement);
    // controls.minDistance = 1;
    // controls.maxDistance = 100000;
    controls.target.set(0, 1, 0);
    controls.update();

    stats = new Stats();
    container.appendChild(stats.dom);

    window.addEventListener('resize', onWindowResize, false);

}

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