Civil 3D 2013利用API把三角网曲面提取为栅格网

//
usingSystem;
usingAutodesk.AutoCAD.Runtime;
usingAutodesk.AutoCAD.ApplicationServices;
usingAutodesk.AutoCAD.DatabaseServices;
usingAutodesk.AutoCAD.Geometry;
usingAutodesk.AutoCAD.EditorInput;
usingAutodesk.Civil.DatabaseServices;
usingAutodesk.Civil;

//Thislineisnotmandatory,butimprovesloadingperformances
[assembly:CommandClass(typeof(SurfaceApiInCivil3D2013.MyCommands))]

namespaceSurfaceApiInCivil3D2013
{

//ThisclassisinstantiatedbyAutoCADforeachdocumentwhen
//acommandiscalledbytheuserthefirsttimeinthecontext
//ofagivendocument.Inotherwords,nonstaticdatainthisclass
//isimplicitlyper-document!
publicclassMyCommands
{
staticDocument_doc=Application.DocumentManager.MdiActiveDocument;
staticEditor_editor=_doc.Editor;
staticDatabasedb=_doc.Database;

privateObjectIdpromptForTinSurface()
{
PromptEntityOptionsoptions=newPromptEntityOptions(
"\nSelectaTINSurface:");
options.SetRejectMessage(
"\nTheselectedobjectisnotaTINSurface.");
options.AddAllowedClass(typeof(TinSurface),true);

PromptEntityResultresult=_editor.GetEntity(options);
if(result.Status==PromptStatus.OK)
{
//Everythingiscool;wereturntheselected
//surfaceObjectId.
returnresult.ObjectId;
}
returnObjectId.Null;//Indicatingerror.
}

[CommandMethod("CDS_ExtractGrid")]
publicvoidCDS_ExtractGrid()
{
ObjectIdsurfaceId=promptForTinSurface();
if(surfaceId==ObjectId.Null)
{
_editor.WriteMessage("\nNoTINSurfaceselected.");
return;
}

using(Transactiontr=db.TransactionManager.StartTransaction())
{
TinSurfacesurface=surfaceId.GetObject(OpenMode.ForRead)
asTinSurface;
ObjectIdCollectionids=surface.ExtractGridded(
SurfaceExtractionSettingsType.Model);

foreach(ObjectIdidinids)
{
Polyline3dpolyline=
id.GetObject(OpenMode.ForWrite)asPolyline3d;
if(polyline!=null)
{
using(polyline)
{
polyline.Color=
Autodesk.AutoCAD.Colors.Color.FromRgb(255,0,0);
}
}
}
tr.Commit();
}
}

}

}

想了解更多Civil3D2013API，请看CivilizedDevelopment博客中的21WOJP系列（21WeekOfJayPeak）,JayPeak是Civil3D2013的代码名。