url: 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer',

        enablePickFeatures: false

    });

   

    var viewer = new Cesium.Viewer('cesiumContainer', {

        imageryProvider: esri,

        contextOptions: {

            webgl: {

                alpha: true

            }

        },

        creditContainer: "creditContainer",

        selectionIndicator: false,

        animation: false,  //是否显示动画控件

        baseLayerPicker: false, //是否显示图层选择控件

        geocoder: false, //是否显示地名查找控件

        timeline: false, //是否显示时间线控件

        sceneModePicker: true, //是否显示投影方式控件

        navigationHelpButton: false, //是否显示帮助信息控件

        infoBox: false,  //是否显示点击要素之后显示的信息

        fullscreenButton: true

    });

    //取消双击事件   viewer.cesiumWidget.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);

    createModel('./sampledata/model/barrel.gltf', 0.0);

    function createModel(url, height) {

        viewer.entities.removeAll();

        var position = Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, height);

        var heading = Cesium.Math.toRadians(135);

        var pitch = 0;

        var roll = 0;

        var hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);

        var orientation = Cesium.Transforms.headingPitchRollQuaternion(position, hpr);

        var entity = viewer.entities.add({

            name: url,

            position: position,

            orientation: orientation,

            model: {

                uri: url,

                minimumPixelSize: 128,

                maximumScale: 20000

            }

        });

        viewer.trackedEntity = entity;

    }