在SuperMap iClient3D 11i(2022) for Cesium中使用DynamicLayer3D图层，实现将S3M模型绕索菲亚大教堂循环飞行。

首先，需要准备好S3M模型和索菲亚大教堂的位置坐标信息。

然后，在SuperMap iClient3D 11i(2022) for Cesium中创建DynamicLayer3D图层，并将S3M模型添加到该图层中。代码示例如下：

var dynamicLayer = new SuperMap.Web.iServerJava6R.DynamicLayer3D("dynamic_layer");
var modelUrl = "http://localhost:8090/iserver/services/3D-CityScenes/rest/realspace";
var modelName = "model.s3m";
var modelPath = modelUrl + "/datas/" + modelName;
var modelOption = new SuperMap.Web.iServerJava6R.ModelOption3D(modelPath);
var model = new SuperMap.Web.iServerJava6R.Model3D(modelOption);
dynamicLayer.addModel(model);

然后，在Cesium中创建飞行路径，并使用Cesium的Camera API实现飞行效果。代码示例如下：

var viewer = new Cesium.Viewer("cesiumContainer");
var sofiaPosition = Cesium.Cartesian3.fromDegrees(23.727538, 42.695432, 100);
viewer.camera.setView({
    destination : sofiaPosition,
    orientation: {
        heading : Cesium.Math.toRadians(0),
        pitch : Cesium.Math.toRadians(-45),
        roll : 0.0
    }
});

var positions = [
    Cesium.Cartesian3.fromDegrees(23.727538, 42.695432, 5000),
    Cesium.Cartesian3.fromDegrees(23.727538, 42.695432, 2000),
    Cesium.Cartesian3.fromDegrees(23.727538, 42.695432, 5000),
    Cesium.Cartesian3.fromDegrees(23.727538, 42.695432, 2000)
];

var flight = Cesium.CameraFlightPath.createAnimationCartesian(viewer, {
    destinations : positions,
    duration: 3.0,
    loop: true,
    orientation : {
        duration: 3.0,
        heading : Cesium.Math.toRadians(0),
        pitch : Cesium.Math.toRadians(-45),
        roll : 0.0
    }
});
viewer.timeline.add(flight);

viewer.scene.preRender.addEventListener(function(scene, time) {
    var position = flight.update(time);
    if (position) {
        viewer.camera.setView({
            destination : position,
            orientation: flight.endOrientation
        });
    }
});

最后，将DynamicLayer3D图层添加到Cesium的场景中，并启动Cesium的渲染循环。代码示例如下：

viewer.scene.primitives.add(dynamicLayer);
viewer.clock.onTick.addEventListener(function(clock) {
    dynamicLayer.refresh();
});
viewer.render();

这样就可以实现将S3M模型绕索菲亚大教堂循环飞行的效果了。