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Hi!
I need to iterate through the user selected cut lines and for every cutline, identify the solids crossing and slice them to that line. Below the code is working for single line selection. But for multiple lines selection, in the second iteration, getting the error.
Any help would be greatly appreciated.
Image: User Selecting Lines & Solids to Identify
Code:
Public Sub SliceSolid()
Dim Doc As Document = Application.DocumentManager.MdiActiveDocument
Dim DB As Database = Doc.Database
Dim Ed As Editor = Doc.Editor
Try
Using Tr As Transaction = DB.TransactionManager.StartTransaction
Dim BT As BlockTable = Tr.GetObject(DB.BlockTableId, OpenMode.ForRead)
Dim BTR As BlockTableRecord = Tr.GetObject(BT(BlockTableRecord.ModelSpace), OpenMode.ForWrite)
Dim SObjPrRes As PromptSelectionResult = Ed.GetSelection
If SObjPrRes.Status = PromptStatus.OK Then
Dim SSet As SelectionSet = SObjPrRes.Value
For Each Obj As SelectedObject In SSet
Dim Ent As Entity = Tr.GetObject(Obj.ObjectId, OpenMode.ForRead)
If Obj.ObjectId.ObjectClass.DxfName = "LINE" Then
Dim L As Line : L = Ent
Dim PT1 As Point3d = L.StartPoint : Dim PT2 As Point3d = L.EndPoint
Ed.WriteMessage(vbLf & "Line Start : " & L.StartPoint.ToString & " - Line End :" & L.EndPoint.ToString)
Dim CrossSelection As SelectionSet = SelectObjectsByCrossingWindow(L.StartPoint, L.EndPoint)
'PrintSelectionSetObjectIds(CrossSelection)
'SliceSolidsByPoints(CrossSelection, L.StartPoint, L.EndPoint)
Using Tr2 As Transaction = DB.TransactionManager.StartTransaction
For Each Obj2 As SelectedObject In CrossSelection
If Obj2.ObjectId.ObjectClass.DxfName = "3DSOLID" Then
Dim Sol3D As Solid3d = Tr2.GetObject(Obj2.ObjectId, OpenMode.ForWrite)
Dim Pt3 As Point3d = New Point3d(PT1.X, PT1.Y, PT1.Z)
Dim Pt4 As Point3d = New Point3d(PT1.X, PT1.Y, PT1.Z + 10)
Dim Pt5 As Point3d = New Point3d(PT2.X, PT2.Y, PT1.Z + 10)
Dim acPlane As Plane = New Plane(Pt3, Pt4, Pt5)
Dim Sol3DSlice As Solid3d = Sol3D.Slice(acPlane, True)
BTR.AppendEntity(Sol3DSlice)
Tr2.AddNewlyCreatedDBObject(Sol3DSlice, True)
Ed.WriteMessage(vbLf & "New Solid Created: " & Sol3DSlice.ObjectId.ToString())
End If
Next
Tr2.Commit()
End Using
End If
Next
End If
Tr.Commit()
End Using
Catch ex As Exception
MsgBox(ex.ToString, , "Sub - " & System.Reflection.MethodBase.GetCurrentMethod.Name)
Clipboard.SetText(ex.ToString)
End Try
End Sub
Error:
System.InvalidOperationException: Operation is not valid due to the current state of the object.
at Autodesk.AutoCAD.Runtime.DisposableWrapper.Attach(IntPtr unmanagedPointer, Boolean autoDelete)
at Autodesk.AutoCAD.DatabaseServices.Solid3d.Slice(Plane plane, Boolean negativeHalfToo)
at ClassLibrary1.SliceSolids.SliceSolid()
From the code, looks like you're trying to slice the same solid twice? I believe that may fail as the solid is not there anymore...
But note the top transaction is not committing, so that can cause the issue. From your error message and code, that can be the issue. Can you try with only 1 transaction that commit on every slice?
Hi,
So I did a further investigation on this.
The DisposableWrapper will throw this InvalidOperation exception if the object being created is NULL/Nothing (among other problems). But as this is happening inside the API, it's not on your code.
If you look at the C++ documentation, the SLICE method will return OK even if the plane is not crossing the solid, but the sliced solid is null/nothing, and the this pointer is passed on and cause the exception...
So in your case, if the line does not cross the solid, it throw this exception. Sadly
To fix it, put a try/catch around the Solid3D.Slice call, it this InvalidOperationException happens, then you know the solid and the plane (formed by the line points) are not crossing.
Looking at your code, you have no check around this, but you need to. Make sure the LINE and SOLID are crossing. Note that when you slice, you have no testing if the next line will cross the original solid (now sliced) or new piece...
So I did a further investigation on this.
The DisposableWrapper will throw this InvalidOperation exception if the object being created is NULL/Nothing (among other problems). But as this is happening inside the API, it's not on your code.
If you look at the C++ documentation, the SLICE method will return OK even if the plane is not crossing the solid, but the sliced solid is null/nothing, and the this pointer is passed on and cause the exception...
So in your case, if the line does not cross the solid, it throw this exception. Sadly
To fix it, put a try/catch around the Solid3D.Slice call, it this InvalidOperationException happens, then you know the solid and the plane (formed by the line points) are not crossing.
Looking at your code, you have no check around this, but you need to. Make sure the LINE and SOLID are crossing. Note that when you slice, you have no testing if the next line will cross the original solid (now sliced) or new piece...
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