Adding a DEM file to AutoCAD Civil 3D TIN Surface

By Partha Sarkar

SurfaceDefinitionDEMFiles.AddDEMFile() allows us to add DEM data to a Civil 3D Surface. This function has few overloaded method. In this example we will explore the simplest one of using a DEM file to create a TIN Surface in AutoCAD Civil 3D. Here is the relevant C# .NET code snippet :

try

{

    // Select a Surface style to use

    ObjectId styleId = civilDoc.Styles.SurfaceStyles[0];

 

    // Create an empty TIN Surface

    ObjectId surfaceId = TinSurface.Create("DEM_Surface", styleId);

    TinSurface surface = trans.GetObject(surfaceId, OpenMode.ForWrite) as TinSurface;

 

    // Path of the DEM file

    String demFilePath = @"C:\Civil3D_Data\DEMs\Munich.dem";                   

    surface.DEMFilesDefinition.AddDEMFile(demFilePath);

    surface.Description = "Created from DEM File";                   

 

    trans.Commit();

}