在实际应用中，漫游的路线是规划好的。也就是一系列的坐标点，然后根据坐标点插值计算，平滑运动。获取的方式很多种，看实际项目需求。我是事先选取好的点。
var myPositions = [ [109.05832893717263, 37.441496598851096], [109.05855416786699, 37.44130123438769],//... [109.0587449465546, 37.44119249116668], [109.05845600554856, 37.441396645980845],];只有经纬度没有高度，因为我是把高度写死的，如果需要高度变化，是可以加上高度。
指定动画的起始时间，然后把 timeline 调整至起始时间，然后设置相关参数
var start = Cesium.JulianDate.fromDate(new Date(2015, 2, 25, 16));var stop = Cesium.JulianDate.addSeconds( start, myPositions.length - 1, new Cesium.JulianDate());//Make sure viewer is at the desired time.viewer.clock.startTime = start.clone();viewer.clock.stopTime = stop.clone();viewer.clock.currentTime = start.clone();viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP; //Loop at the endviewer.clock.multiplier = 0.3;//Set timeline to simulation boundsviewer.timeline.zoomTo(start, stop);开始时间是可以随意给定的，我这里给的是 new Date(2015, 2, 25,16)结束时间这一点需要注意的是，根据数组的长度来定的。结束时间必须大于开始时间。
var stop = Cesium.JulianDate.addSeconds(start,myPositions.length - 1,new Cesium.JulianDate() );设置动画的参数：clockRange 是播放模式 Cesium.ClockRange.LOOP_STOP 自动循环播放。multiplier 是播放的速度
根据坐标数组，计算插值点数据
function computeCirclularFlight() {var property = new Cesium.SampledPositionProperty();//设置插入选项property.setInterpolationOptions({ // interpolationDegree: 1, // interpolationAlgorithm: Cesium.LinearApproximation, // interpolationDegree: 5, // interpolationAlgorithm: //Cesium.LagrangePolynomialApproximation, interpolationDegree: 2, interpolationAlgorithm: Cesium.HermitePolynomialApproximation,});for (var i = 0; i < myPositions.length; i++) { var time = Cesium.JulianDate.addSeconds(start,i,new Cesium.JulianDate() ); var position = Cesium.Cartesian3.fromDegrees(myPositions[i][0],myPositions[i][1],5 ); property.addSample(time, position);}return property;}不同插值配置设置，得出来的结果是不同的，可以参照Cesium示例查看。
创建运动的物体，并把物体设置为镜头追踪的对象。
var position = computeCirclularFlight();//Actually create the entityvar entity = viewer.entities.add({ //Set the entity availability to the same interval as the simulation time. availability: new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({ start: start, stop: stop,}), ]), //Use our computed positions position: position, //Automatically compute orientation based on position movement. orientation: new Cesium.VelocityOrientationProperty(position), model: {uri: './SampleData/models/CesiumAir/Cesium_Air.glb',minimumPixelSize: 64, }, //Show the path as a pink line sampled in 1 second increments. path: {resolution: 1,material: new Cesium.PolylineGlowMaterialProperty({ glowPower: 0.1, color: Cesium.Color.GREEN,}),width: 16, },});//追踪物体 viewer.trackedEntity = entity;每一帧根据物体的坐标和走向，设置相机的角度
//视角变换 var matrix3Scratch = new Cesium.Matrix3(); function getModelMatrix(entity, time, result) { var position = Cesium.Property.getValueOrUndefined(entity.position,time,new Cesium.Cartesian3() ); if (!Cesium.defined(position)) {return undefined; } var orientation = Cesium.Property.getValueOrUndefined(entity.orientation,time,new Cesium.Quaternion() ); if (!Cesium.defined(orientation)) {result = Cesium.Transforms.eastNorthUpToFixedFrame( position, undefined, result); } else {result = Cesium.Matrix4.fromRotationTranslation( Cesium.Matrix3.fromQuaternion(orientation, matrix3Scratch), position, result); } return result;} var scratch = new Cesium.Matrix4(); var renderListener = function (e) { //viewer.camera.positionCartographic.height = 2000 + $this.limitCamera(f_property); if (viewer.trackedEntity) {getModelMatrix(viewer.trackedEntity, viewer.clock.currentTime, scratch);var transformX = 90; //距离运动点的距离（后方）var transformZ = 55; //距离运动点的高度（上方）var transformY = 0; //距离运动点的高度（侧方）viewer.scene.camera.lookAtTransform( scratch, new Cesium.Cartesian3(-transformX, transformY, transformZ)); }}; viewer.scene.preRender.addEventListener(renderListener);监听事件中，transformX 是相机距离运动点的正后方距离。transformY 是相机距离运动点的侧方距离。transformZ 是相机距离运动点的上方距离。
开始播放的时候 需要把 shouldAnimate 打开， viewer.clock.shouldAnimate = true;暂停播放 需要把 shouldAnimate 关闭， viewer.clock.shouldAnimate = false; 同时把镜头追踪对象去除 viewer.trackedEntity = undefined;