Imports Autodesk.AutoCAD.Runtime

Imports Autodesk.AutoCAD.ApplicationServices

Imports Autodesk.AutoCAD.DatabaseServices

Imports Autodesk.AutoCAD.Geometry

<CommandMethod("MirrorABox3D")> _

Public Sub MirrorABox3D()

  '' Get the current document and database, and start a transaction

  Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument

  Dim acCurDb As Database = acDoc.Database

  Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()

      '' Open the Block table for read

      Dim acBlkTbl As BlockTable

      acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, _

                                   OpenMode.ForRead)

      '' Open the Block table record Model space for write

      Dim acBlkTblRec As BlockTableRecord

      acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _

                                      OpenMode.ForWrite)

      '' Create a 3D solid box

      Dim acSol3D As Solid3d = New Solid3d()

      acSol3D.CreateBox(5, 7, 10)

      '' Position the center of the 3D solid at (5,5,0) 

      acSol3D.TransformBy(Matrix3d.Displacement(New Point3d(5, 5, 0) - _

                                                Point3d.Origin))

      '' Add the new object to the block table record and the transaction

      acBlkTblRec.AppendEntity(acSol3D)

      acTrans.AddNewlyCreatedDBObject(acSol3D, True)

      '' Create a copy of the original 3D solid and change the color of the copy

      Dim acSol3DCopy As Solid3d = acSol3D.Clone()

      acSol3DCopy.ColorIndex = 1

      '' Define the mirror plane

      Dim acPlane As Plane = New Plane(New Point3d(1.25, 0, 0), _

                                       New Point3d(1.25, 2, 0), _

                                       New Point3d(1.25, 2, 2))

      '' Mirror the 3D solid across the plane

      acSol3DCopy.TransformBy(Matrix3d.Mirroring(acPlane))

      '' Add the new object to the block table record and the transaction

      acBlkTblRec.AppendEntity(acSol3DCopy)

      acTrans.AddNewlyCreatedDBObject(acSol3DCopy, True)

      '' Save the new objects to the database

      acTrans.Commit()

  End Using

End Sub

using Autodesk.AutoCAD.Runtime;

using Autodesk.AutoCAD.ApplicationServices;

using Autodesk.AutoCAD.DatabaseServices;

using Autodesk.AutoCAD.Geometry;

[CommandMethod("MirrorABox3D")]

public static void MirrorABox3D()

{

  // Get the current document and database, and start a transaction

  Document acDoc = Application.DocumentManager.MdiActiveDocument;

  Database acCurDb = acDoc.Database;

  using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())

  {

      // Open the Block table record for read

      BlockTable acBlkTbl;

      acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,

                                   OpenMode.ForRead) as BlockTable;

      // Open the Block table record Model space for write

      BlockTableRecord acBlkTblRec;

      acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],

                                      OpenMode.ForWrite) as BlockTableRecord;

      // Create a 3D solid box

      Solid3d acSol3D = new Solid3d();

      acSol3D.CreateBox(5, 7, 10);

      // Position the center of the 3D solid at (5,5,0)

      acSol3D.TransformBy(Matrix3d.Displacement(new Point3d(5, 5, 0) -

                                                Point3d.Origin));

      // Add the new object to the block table record and the transaction

      acBlkTblRec.AppendEntity(acSol3D);

      acTrans.AddNewlyCreatedDBObject(acSol3D, true);

      // Create a copy of the original 3D solid and change the color of the copy

      Solid3d acSol3DCopy = acSol3D.Clone() as Solid3d;

      acSol3DCopy.ColorIndex = 1;

      // Define the mirror plane

      Plane acPlane = new Plane(new Point3d(1.25, 0, 0),

                                new Point3d(1.25, 2, 0),

                                new Point3d(1.25, 2, 2));

      // Mirror the 3D solid across the plane

      acSol3DCopy.TransformBy(Matrix3d.Mirroring(acPlane));

      // Add the new object to the block table record and the transaction

      acBlkTblRec.AppendEntity(acSol3DCopy);

      acTrans.AddNewlyCreatedDBObject(acSol3DCopy, true);

      // Save the new objects to the database

      acTrans.Commit();

  }

}