多边形网格表示由能够具有多个顶点的面定义的对象的表面。创建多边形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边网格。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,请使用该方法创建顶点并将其添加到对象中。PolyFaceMeshPolyFaceMeshPolyFaceMeshVertexPolyFaceMeshAppendVertex 创建多边面网格时,可以将特定边设置为不可见、将其指定给图层或为其指定颜色。要使边缘不可见,请创建 aand 的实例,并设置哪些边缘应该不可见,然后使用该方法将对象附加到对象。FaceRecordFaceRecordPolyFaceMeshAppendFaceRecord 创建多边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 VB.NETImports 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 C#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(); } } VBA/ActiveX Code ReferenceSub 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 |
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