创建多边形网格 （.NET）

多面网格表示由能够具有多个顶点的面定义的对象的表面。创建多面网格类似于创建矩形网格。您可以通过创建对象的实例来创建多面网格。对象的构造函数不接受任何参数。要将顶点添加到多面网格，请创建一个顶点并使用该方法将其添加到对象中。PolyFaceMeshPolyFaceMeshPolyFaceMeshVertexPolyFaceMeshAppendVertex

创建多面网格时，可以将特定边设置为不可见，将其指定给图层，或为其赋予颜色。若要使边不可见，请创建一个实例并设置哪些边应该是不可见的，然后使用该方法将对象追加到对象。FaceRecordFaceRecordPolyFaceMeshAppendFaceRecord

创建多面网格

本示例创建一个对象并更改活动视口的查看方向，以显示网格的三维性质。PolyfaceMesh

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
 
<CommandMethod("CreatePolyfaceMesh")> _
Public Sub CreatePolyfaceMesh()
    '' 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 polyface mesh
        Using acPFaceMesh As PolyFaceMesh = New PolyFaceMesh()

            '' Add the new object to the block table record and the transaction
            acBlkTblRec.AppendEntity(acPFaceMesh)
            acTrans.AddNewlyCreatedDBObject(acPFaceMesh, True)

            '' Before adding vertexes, the polyline must be in the drawing
            Dim acPts3dPFMesh As Point3dCollection = New Point3dCollection()
            acPts3dPFMesh.Add(New Point3d(4, 7, 0))
            acPts3dPFMesh.Add(New Point3d(5, 7, 0))
            acPts3dPFMesh.Add(New Point3d(6, 7, 0))

            acPts3dPFMesh.Add(New Point3d(4, 6, 0))
            acPts3dPFMesh.Add(New Point3d(5, 6, 0))
            acPts3dPFMesh.Add(New Point3d(6, 6, 1))

            For Each acPt3d As Point3d In acPts3dPFMesh
                Dim acPMeshVer As PolyFaceMeshVertex = New PolyFaceMeshVertex(acPt3d)
                acPFaceMesh.AppendVertex(acPMeshVer)
                acTrans.AddNewlyCreatedDBObject(acPMeshVer, True)
            Next

            Using acFaceRec1 As FaceRecord = New FaceRecord(1, 2, 5, 4)
                acPFaceMesh.AppendFaceRecord(acFaceRec1)
                acTrans.AddNewlyCreatedDBObject(acFaceRec1, True)
            End Using

            Using acFaceRec2 As FaceRecord = New FaceRecord(2, 3, 6, 5)
                acPFaceMesh.AppendFaceRecord(acFaceRec2)
                acTrans.AddNewlyCreatedDBObject(acFaceRec2, True)
            End Using
        End Using

        '' Open the active viewport
        Dim acVportTblRec As ViewportTableRecord
        acVportTblRec = acTrans.GetObject(acDoc.Editor.ActiveViewportId, _
                                          OpenMode.ForWrite)

        '' Rotate the view direction of the current viewport
        acVportTblRec.ViewDirection = New Vector3d(-1, -1, 1)
        acDoc.Editor.UpdateTiledViewportsFromDatabase()

        '' 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("CreatePolyfaceMesh")]
public static void CreatePolyfaceMesh()
{
    // 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 polyface mesh
        using (PolyFaceMesh acPFaceMesh = new PolyFaceMesh())
        {
            // Add the new object to the block table record and the transaction
            acBlkTblRec.AppendEntity(acPFaceMesh);
            acTrans.AddNewlyCreatedDBObject(acPFaceMesh, true);

            // Before adding vertexes, the polyline must be in the drawing
            Point3dCollection acPts3dPFMesh = new Point3dCollection();
            acPts3dPFMesh.Add(new Point3d(4, 7, 0));
            acPts3dPFMesh.Add(new Point3d(5, 7, 0));
            acPts3dPFMesh.Add(new Point3d(6, 7, 0));

            acPts3dPFMesh.Add(new Point3d(4, 6, 0));
            acPts3dPFMesh.Add(new Point3d(5, 6, 0));
            acPts3dPFMesh.Add(new Point3d(6, 6, 1));

            foreach (Point3d acPt3d in acPts3dPFMesh)
            {
                PolyFaceMeshVertex acPMeshVer = new PolyFaceMeshVertex(acPt3d);
                acPFaceMesh.AppendVertex(acPMeshVer);
                acTrans.AddNewlyCreatedDBObject(acPMeshVer, true);
            }

            using (FaceRecord acFaceRec1 = new FaceRecord(1, 2, 5, 4))
            {
                acPFaceMesh.AppendFaceRecord(acFaceRec1);
                acTrans.AddNewlyCreatedDBObject(acFaceRec1, true);
            }

            using (FaceRecord acFaceRec2 = new FaceRecord(2, 3, 6, 5))
            {
                acPFaceMesh.AppendFaceRecord(acFaceRec2);
                acTrans.AddNewlyCreatedDBObject(acFaceRec2, true);
            }
        }

        // Open the active viewport
        ViewportTableRecord acVportTblRec;
        acVportTblRec = acTrans.GetObject(acDoc.Editor.ActiveViewportId,
                                            OpenMode.ForWrite) as ViewportTableRecord;

        // Rotate the view direction of the current viewport
        acVportTblRec.ViewDirection = new Vector3d(-1, -1, 1);
        acDoc.Editor.UpdateTiledViewportsFromDatabase();

        // Save the new objects to the database
        acTrans.Commit();
    }
}

Sub CreatePolyfaceMesh()
    'Define the mesh vertices
    Dim vertex(0 To 17) As Double
    vertex(0) = 4: vertex(1) = 7: vertex(2) = 0
    vertex(3) = 5: vertex(4) = 7: vertex(5) = 0
    vertex(6) = 6: vertex(7) = 7: vertex(8) = 0
    vertex(9) = 4: vertex(10) = 6: vertex(11) = 0
    vertex(12) = 5: vertex(13) = 6: vertex(14) = 0
    vertex(15) = 6: vertex(16) = 6: vertex(17) = 1
 
    ' Define the face list
    Dim FaceList(0 To 7) As Integer
    FaceList(0) = 1
    FaceList(1) = 2
    FaceList(2) = 5
    FaceList(3) = 4
    FaceList(4) = 2
    FaceList(5) = 3
    FaceList(6) = 6
    FaceList(7) = 5
 
    ' Create the polyface mesh
    Dim polyfaceMeshObj As AcadPolyfaceMesh
    Set polyfaceMeshObj = ThisDrawing.ModelSpace. _
                              AddPolyfaceMesh(vertex, FaceList)
 
    ' Change the viewing direction of the viewport to
    ' better see the polyface mesh
    Dim NewDirection(0 To 2) As Double
    NewDirection(0) = -1
    NewDirection(1) = -1
    NewDirection(2) = 1
    ThisDrawing.ActiveViewport.direction = NewDirection
    ThisDrawing.ActiveViewport = ThisDrawing.ActiveViewport
 
    ZoomAll
End Sub