三维是ArcGIS Runtime Quartz版本的新功能，截至2017年7月，三维功能正式覆盖Android、IOS、Windows三大平台。三维场景的构建、三维内容的加载，在之前的博客里面也有提到，像第二篇博客中提到的构建第一个ArcGIS Runtime WPF应用程序即搭建的三维应用程序。

我们来根据Runtime SDK中提供的两个重要类以及若干重要属性来认识Runtime的三维。

相机类-Camera

public Camera(MapPoint locationPoint, double heading, double pitch, double roll);

public Camera(MapPoint lookAtPoint, double distance, double heading, double pitch, double roll);

其中，lookAtPoint为相机观察点，distance是相机与目标的距离。

再来看，Camera类提供的几个重要方法。

public Camera MoveForward(double distance);

MoveForward()方法允许相机沿视线前进若干距离。

public Camera MoveTo(MapPoint location);

MoveTo()方法允许相机移动到某一空间点。

public Camera RotateAround(MapPoint targetPoint, double deltaHeading, double deltaPitch, double deltaRoll);

RotateAround()方法允许相机绕某一固定点旋转，这个方法在展示地形、模型时作用较大。

public Camera RotateTo(double heading, double pitch, double roll);

RotateTo()方法允许相机原地改变姿态。

观察视角类-ViewPoint

ViewPoint是相机的观察点。ViewPoint的构造函数很多。

public Viewpoint(Geometry.Geometry targetGeometry);
public Viewpoint(Geometry.Geometry targetGeometry, Camera camera);
public Viewpoint(Geometry.Geometry targetGeometry, double rotation);
public Viewpoint(MapPoint center, double scale);
public Viewpoint(Geometry.Geometry targetGeometry, double rotation, Camera camera);
public Viewpoint(double latitude, double longitude, double scale);
public Viewpoint(MapPoint center, double scale, Camera camera);
public Viewpoint(MapPoint center, double scale, double rotation);
public Viewpoint(double latitude, double longitude, double scale, Camera camera);
public Viewpoint(MapPoint center, double scale, double rotation, Camera camera);

SceneView的几个重要方法

带Async的方法，从字面上就能看出来是异步方法，SetViewpointCamera()和SetViewpointCameraAsync()的签名如下：

public void SetViewpointCamera(Camera camera);
public Task<bool> SetViewpointCameraAsync(Camera camera);
public Task<bool> SetViewpointCameraAsync(Camera camera, TimeSpan duration);

SetViewpointCamera()能将主相机瞬间移动至camera参数所在的位置。而SetViewpointCameraAsync()允许将主相机通过动画移动至目标相机位置，并且这个异步方法有两个重载，在第二个重载中，还能去设置这个动画的时间。

动目标展示

Runtime提供接口，允许动态改变要素的位置。这样一来，Runtime也可用作三维情态势展示、沙盘演练等。
假设有一个客户端发报机，或者中转机，在使用UDP协议不断往服务器发报，承载报文的结构体如下：

struct ObjectPosition
{
    //经度
    public double longitude;
    //纬度
    public double latitude;
    //高度
    public double altitude;
    //朝向
    public double heading;
    //倾角
    public double pitch;
    //翻滚
    public double roll;
}
struct LiObject
{
    public string batch;
    public int bathno;
    public List<ObjectPosition> objecttrail;
}

报文示例如下：N000001;000001;103.32;43.78;50000;30.19;20.69;2.52;

接收到报文后，处理报文的代码如下，由于要素的位置改变牵扯到前端UI线程，故这里用Dispatcher.Invoke()。

public  void ReciveMsg()
{
    while (true)
    {
        EndPoint point = new IPEndPoint(IPAddress.Any, 0);//用来保存发送方的ip和端口号
        byte[] buffer = new byte[1024];
        int length = client.ReceiveFrom(buffer, ref point);//接收数据报
        string message = Encoding.UTF8.GetString(buffer, 0, length);
        //报文分组
        string [] ms=message.Split(';');
        ObjectPosition op = new ObjectPosition(); 
        //先解析批号
        String batchname = ms[0];
        //看批号是否存在，如果已存在，更新
        if (findLiObject.Keys.Contains(batchname))
        {
            Graphic curGraphic = findGraphic[batchname];
            op.longitude = double.Parse(ms[2]);
            op.latitude = double.Parse(ms[3]);
            op.altitude = double.Parse(ms[4]);
            op.heading = double.Parse(ms[5]);
            op.pitch = double.Parse(ms[6]);
            op.roll = double.Parse(ms[7]);
            Dispatcher.Invoke(DispatcherPriority.Normal, new AddGraphicDelegate(UpdateGraphicPosition), op, curGraphic);
        }
        else
        {
            Dispatcher.Invoke(DispatcherPriority.Normal, new createModelGraphicDelegate(createModelGraphic),batchname);
        }
    }
}

private void UpdateGraphicPosition(ObjectPosition op,Graphic g)
{
    MapPoint location = new MapPoint(op.longitude, op.latitude, op.altitude, SpatialReferences.Wgs84);
    g.Geometry = location;
    g.Attributes["Heading"] = op.heading;
    g.Attributes["Pitch"] = op.pitch;
    g.Attributes["Roll"] = op.roll;
}

这样一来，就能根据发报机发送的报文，时时更新要素空间姿态。

相机控制器

var orbitGraphicController = new OrbitGeoElementCameraController(graphics, 50000);
mysceneview.CameraController = new GlobeCameraController();

mysceneview.CameraController = new GlobeCameraController();