CRhinoCommand::result CCommandTestSdk::RunCommand( const CRhinoCommandContext& context )
        {
          CRhinoGetObject gc;
          gc.SetCommandPrompt( L"Select a curve on a surface" );
          gc.SetGeometryFilter( CRhinoGetObject::curve_object );
          gc.GetObjects( 1, 1 );
          if( gc.CommandResult() != CRhinoCommand::success )
            return gc.CommandResult();


          const ON_Curve* pC3d = gc.Object(0).Curve();
          if( !pC3d )
            return CRhinoCommand::failure;


          CRhinoGetObject gs;
          gs.SetCommandPrompt(L"Select the surface" );
          gs.EnableHighlight();
          gs.SetGeometryFilter( CRhinoGetObject::surface_object );
          gs.EnableDeselectAllBeforePostSelect( false );
          gs.EnablePreSelect( FALSE );
          gs.GetObjects( 1, 1 );
          if( gs.CommandResult() != CRhinoCommand::success )
            return gs.CommandResult();


          const ON_Surface* pS = gs.Object(0).Surface();
          if( !pS )
            return CRhinoCommand::failure;


          ON_Curve* pC2d = pS->Pullback( *pC3d, context.m_doc.AbsoluteTolerance() );
          if( !pC2d )
          {
            RhinoApp().Print( L"Unable to pull curve to surface.\n" );
            return CRhinoCommand::failure;
          }


          // At this point we now have a 2D curve to do with what we want.
          // In this case, we will just add it to the document.
          pC2d->ChangeDimension(3);
          if( pC2d->IsValid() )
          {
            CRhinoCurveObject* crv_obj = new CRhinoCurveObject();
            crv_obj->SetCurve( pC2d );
            if( !context.m_doc.AddObject(crv_obj) )
            {
              delete crv_obj;
              return CRhinoCommand::failure;
            }
          }


          context.m_doc.Redraw();


          return CRhinoCommand::success;
        }