这两天替别人写一个三维校园的展示程序。用的是SceneControl二次开发。

须要利用DOM和TIN构建三维地形。如今说下依据高程点生成TIN的过程：

（1）依据高程点文件（Excel）生成点shapefile

（2）使用ITinEdit的AddFromFeatureClass方法生成TIN

高程点数据格式例如以下：

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操作界面例如以下：

：

生成TIN效果图：

代码非常easy理解，例如以下：

   #region 创建TIN

        private void button_ok_Click(object sender , EventArgs e)

        {

            try

            {

                strTinName=textBox_TINName.Text;

                outFolder=textBox_outpath.Text;

                if (strTinName=="")

                {

                    MessageBox.Show("请输入TIN名称！");

                }

                else if (outFolder=="")

                {

                    MessageBox.Show("请选择TIN保存路径");

                }

                else

                {

                    //生成点shape

                    Excel2Shape excel2shape = new Excel2Shape(textBox_point.Text);

                    excel2shape.CreateShapeFromExcel();

                    //获取shapefile

                    string path = excel2shape.path;

                    string name = excel2shape.name;

                    IWorkspaceFactory pWSFac = new ShapefileWorkspaceFactoryClass();

                    IFeatureWorkspace pFeatureWS = pWSFac.OpenFromFile(path , 0) as IFeatureWorkspace;

                    IFeatureClass pFeatureClass = pFeatureWS.OpenFeatureClass(name);

                    IField pField = pFeatureClass.Fields.get_Field(pFeatureClass.FindField("Z"));

                    //创建TIN

                    ITin pTin = Create_TIN(pFeatureClass , pField , outFolder);

                    ITinLayer pTinlayer = new TinLayerClass();

                    pTinlayer.Dataset = pTin;

                    pTinlayer.Name = strTinName;

                    pSceneControl.SceneGraph.Scene.AddLayer(pTinlayer as ILayer , true);

                    this.Close();

                }

            }

            catch (System.Exception ex)

            {

                MessageBox.Show(ex.Message + "创建TIN失败。");

            }

        }

        /// <summary>

        /// 创建TIN

        /// </summary>

        /// <param name="pFeatureClass">点要素类</param>

        /// <param name="pField">Z字段</param>

        /// <param name="pPath">路径</param>

        public ITin Create_TIN(IFeatureClass pFeatureClass , IField pField , string pPath)

        {

            IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;

            ITinEdit pTinEdit = new TinClass();

            pTinEdit.InitNew(pGeoDataset.Extent);

            object pObj = Type.Missing;

            pTinEdit.AddFromFeatureClass(pFeatureClass , null , pField , null ,

            esriTinSurfaceType.esriTinMassPoint , ref pObj);

            if (System.IO.File.Exists(pPath))

            {

                _3DCampus.helper.FolderHelper.DeleteFolder(pPath);

            }

            pTinEdit.SaveAs(pPath , ref pObj);

            pTinEdit.Refresh();

            return pTinEdit as ITin;

        }

        #endregion