Datum Plane Undefinable error

[junfanbl]

Hey everyone, I have been trying to build a journal to accomplish a specific task. What I am trying to do is place a datum plane using the bounding box coordinates of a model. I would like to fill in the bounding box in both the x and y directions. For the Z it should be the minimum value. That is how I currently have it set up in my code below.

However for some reason when I try and place the datum plane It gives me an error saying the "datum plane is undefinable".
If I record a journal while placing a datum plane by using Point and direction, the coordinates that it produces are very similar to what the bounding box is producing. I don't see why the plane won't place. In the code below I attempt to use the coefficient method. Not sure if that has anything to do with it but I thought that would be a better option.

Any ideas?

Option Strict Off
Imports System
Imports NXOpen
Imports NXOpen.UF
Imports NXOpen.Utilities

Module NXJournal
    Dim theSession As NXOpen.Session = NXOpen.Session.GetSession()
    Dim theUfSession As UFSession = UFSession.GetUFSession()
    Dim workPart As NXOpen.Part = theSession.Parts.Work
    Dim displayPart As NXOpen.Part = theSession.Parts.Display
    Dim lw As ListingWindow = theSession.ListingWindow

    Sub Main(ByVal args() As String)

        Dim theBody As Body
        If SelectBody("select a body", theBody) = Selection.Response.Cancel Then
            Return
        End If

        'Need to get bounding box of model to establish datum plane coordinates later on
        Dim bbox(5) As Double
        theUfSession.Modl.AskBoundingBox(theBody.Tag, bbox)
        'lengths returned in part units
        Dim bodyLengths(2) As Double
        bodyLengths = GetBoundingBox(theBody)

        'Open Information Window
        If Not lw.IsOpen Then
            lw.Open()
        End If

        'Body Lengths
        lw.WriteLine("GET BODY LENGTHS...")
        lw.WriteLine("X length: " & bodyLengths(0).ToString)
        lw.WriteLine("Y length: " & bodyLengths(1).ToString)
        lw.WriteLine("Z length: " & bodyLengths(2).ToString)
        lw.WriteLine("")

        'Min and Max values
        lw.WriteLine("GET MIN/MAX VALUES...")
        lw.WriteLine("min X: " & bbox(0) & " max X: " & bbox(3))
        lw.WriteLine("min Y: " & bbox(1) & " max Y: " & bbox(4))
        lw.WriteLine("min Z: " & bbox(2) & " max Z: " & bbox(5))
        lw.WriteLine("")

        'Insert Datum Planes based on Bounding Box Coordinates
        '==========================================================================================================

        Dim nullNXOpen_Features_Feature As NXOpen.Features.Feature = Nothing

        'Set methods
        Dim datumPlaneBuilder1 As NXOpen.Features.DatumPlaneBuilder
        datumPlaneBuilder1 = workPart.Features.CreateDatumPlaneBuilder(nullNXOpen_Features_Feature)
        Dim plane1 As NXOpen.Plane
        plane1 = datumPlaneBuilder1.GetPlane()

        'Set units
        'Dim unit1 As NXOpen.Unit = CType(workPart.UnitCollection.FindObject("Inches"), NXOpen.Unit)

        'Not sure what this does
        Dim coordinates1 As NXOpen.Point3d = New NXOpen.Point3d(0.0, 0.0, bbox(2))
        Dim point1 As NXOpen.Point
        point1 = workPart.Points.CreatePoint(coordinates1)

        'Determine Axis?
        Dim origin1 As NXOpen.Point3d = New NXOpen.Point3d(0.0, 0.0, 0)
        Dim vector1 As NXOpen.Vector3d = New NXOpen.Vector3d(0.0, 0.0, 1.0)
        Dim direction1 As NXOpen.Direction
        direction1 = workPart.Directions.CreateDirection(origin1, vector1, NXOpen.SmartObject.UpdateOption.WithinModeling)

        'Not sure what this does
        plane1.SetUpdateOption(NXOpen.SmartObject.UpdateOption.WithinModeling)
        Dim geom1(-1) As NXOpen.NXObject
        plane1.SetGeometry(geom1)

        'Type of plane placement
        plane1.SetMethod(NXOpen.PlaneTypes.MethodType.Coefficients)

        'twice?
        Dim geom2(-1) As NXOpen.NXObject
        plane1.SetGeometry(geom2)

        'Determine Origin?
        Dim origin2 As NXOpen.Point3d = New NXOpen.Point3d(0, 0, 0)
        plane1.Origin = origin2
        Dim normal1 As NXOpen.Vector3d = New NXOpen.Vector3d(0, 0, 0)
        plane1.Normal = normal1

        'Not sure what this does
        plane1.SetAlternate(NXOpen.PlaneTypes.AlternateType.One)
        plane1.Evaluate()

        'Change Offset of location
        plane1.RemoveOffsetData()
        plane1.Evaluate()

        lw.WriteLine("min X: " & bbox(0) & " max X: " & bbox(3))
        lw.WriteLine("min Y: " & bbox(1) & " max Y: " & bbox(4))
        lw.WriteLine("min Z: " & bbox(2) & " max Z: " & bbox(5))

        Dim corner1_1 As NXOpen.Point3d = New NXOpen.Point3d(bbox(0), bbox(1), bbox(2))
        Dim corner2_1 As NXOpen.Point3d = New NXOpen.Point3d(bbox(3), bbox(1), bbox(2))
        Dim corner3_1 As NXOpen.Point3d = New NXOpen.Point3d(bbox(0), bbox(4), bbox(2))
        Dim corner4_1 As NXOpen.Point3d = New NXOpen.Point3d(bbox(3), bbox(4), bbox(2))

        'Finalize placement of plane
        datumPlaneBuilder1.SetCornerPoints(corner1_1, corner2_1, corner3_1, corner4_1)
        datumPlaneBuilder1.ResizeDuringUpdate = True
        Dim feature1 As NXOpen.Features.Feature
        feature1 = datumPlaneBuilder1.CommitFeature()
        Dim datumPlaneFeature1 As NXOpen.Features.DatumPlaneFeature = CType(feature1, NXOpen.Features.DatumPlaneFeature)
        Dim datumPlane1 As NXOpen.DatumPlane
        datumPlane1 = datumPlaneFeature1.DatumPlane
        datumPlane1.SetReverseSection(False)
        datumPlaneBuilder1.Destroy()

    End Sub

    Function SelectBody(ByVal prompt As String, ByRef selObj As TaggedObject) As Selection.Response

        Dim theUI As UI = UI.GetUI
        Dim title As String = "Select a solid body"
        Dim includeFeatures As Boolean = False
        Dim keepHighlighted As Boolean = False
        Dim selAction As Selection.SelectionAction = Selection.SelectionAction.ClearAndEnableSpecific
        Dim cursor As Point3d
        Dim scope As Selection.SelectionScope = Selection.SelectionScope.WorkPart
        Dim selectionMask_array(0) As Selection.MaskTriple

        With selectionMask_array(0)
            .Type = UFConstants.UF_solid_type
            .SolidBodySubtype = UFConstants.UF_UI_SEL_FEATURE_SOLID_BODY
        End With

        Dim resp As Selection.Response = theUI.SelectionManager.SelectTaggedObject(prompt, _
         title, scope, selAction, _
         includeFeatures, keepHighlighted, selectionMask_array, _
         selobj, cursor)
        If resp = Selection.Response.ObjectSelected OrElse resp = Selection.Response.ObjectSelectedByName Then
            Return Selection.Response.Ok
        Else
            Return Selection.Response.Cancel
        End If

    End Function

    Private Function GetBoundingBox(ByVal solidBody As NXOpen.Body) As Double()

        'AskBoundingBox returns min and max coordinates
        'this function will simply return the box lengths (x, y, z)
        Dim bboxCoordinates(5) As Double
        Dim bboxLengths(2) As Double

        Try
            'get solid body bounding box extents
            theUfSession.Modl.AskBoundingBox(solidBody.Tag, bboxCoordinates)
            bboxLengths(0) = bboxCoordinates(3) - bboxCoordinates(0)
            bboxLengths(1) = bboxCoordinates(4) - bboxCoordinates(1)
            bboxLengths(2) = bboxCoordinates(5) - bboxCoordinates(2)

            Return bboxLengths

        Catch ex As NXException
            MsgBox(ex.GetType.ToString & " : " & ex.Message, MsgBoxStyle.OkOnly + MsgBoxStyle.Exclamation, "Solid Body Bounds Error!")
            bboxLengths(0) = 0
            bboxLengths(1) = 0
            bboxLengths(2) = 0
            Return bboxLengths
        End Try

    End Function
End Module