Question

public void NodeAnimationSample()
{
    //读取一个模型文件
    GeoModel geoModel=new GeoModel();
    geoModel.Position=new Point3D(166.38729501,39.91677702,0);
    geoModel.FromFile("G:\\潜艇.3DS");
    //将模型添加到KML图层中
    
    //Layers[0]该图层表示什么？
    Layer3DKML layerKML=this.sceneControl.Scene.Layers[0] as Layer3DKML;
    
    //为什么声明feature？它有什么作用？
    Feature3D feature=layerKML.Features.Add(geoModel);
    //设置添加到KML图层中的模型的节点动画信息
    GeoModel animationModel=feature.Geometry as GeoModel;
    NodeAnimation ani=animationModel.NodeAnimation;
    //设置动画运行周期
    ani.Length=8.0;
    //设置动画播放模式
    ani.PlayMode=PlayMode.Loop;
    //设置节点动画轨迹
    Point3Ds pts=new Point3Ds();
    Point3D pt=new Point3D(116.390697,39.9165005,0);
    pts.Add(pt);
    pt.X=116.391;
    pt.Y=39.9165055;
    pts.Add(pt);
    pt.X=116.3915;
    pt.Y=39.9165055;
    pts.Add(pt);
    GeoLine3D geoLine=new GeoLine3D(pts);
    ani.SetTrack(geoLine);
    //启用节点动画
    ani.IsEnabled=true;
    //将模型及其节点动画保存到KML文件中
    layerKML.Features.ToKMLFile("G:\\data\\节点动画.kml");
}

Answer 1

您好！Layers[0]是指3D图层集合对象里第一个图层，也就是您加载到场景中的KML图层。C#编程时鼠标放在代码上它会有解释，可以帮助您理解。Feature3D是三维要素类，只对KML图层有效。您要在KML图层中添加模型geoModel，就必须用Feature3D。