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Create Body Using Trimmed Surfaces Example (VBA)

The basic outline for creating a body using trimmed surfaces is as follows:

  1. Create a new temporary body in a part using IPartDoc::CreateNewBody.

  2. Create the trimmed surfaces in the shape of the new body (for example, six square surfaces that intersect at the edges to form a cube).

    1. Create a planar surface based on a root point and normal (two, three cell VARIANT arrays) using IBody2::CreatePlanarSurface(RootPoint, Normal).

    2. Add a trimming loop to the planar surface using
      ISurface::AddTrimmingLoop2(Numcurves, _  
      Order, _
      Dimen, _
      Periodic, _
      NumKnots, _
      NumCtrlPoints, _
      Knots, _
      CtrlPointDbls, _
      UVRange)

    3. Create a trimmed surface on the body based on the trimming loop that was just created. The arguments for Surface::AddTrimmingLoop2 and their values for a square are:
       

      Argument

      Description

      NumCurves

      Number of curves that make up the loop (4 Long)

      Order

      Orders for the spline curves ({2, 2, 2, 2} Array of Longs)

      Dimen

      Dimension of the control points for the spline curves ({2, 2, 2, 2} Array of Longs)

      Periodic

      Periodicity of the spline curves ({0, 0, 0, 0} Array of Longs)

      NumKnots

      Number of Knots of the spline curves ({4, 4, 4, 4} Array of Longs)

      NumCtrlPoints

      Number of Control points for the spline curves ({2, 2, 2, 2} Array of Longs)

      Knots

      Describes the locations of the knots ({0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1} Array of Doubles. Each knot represented by four numbers 0, 0, 1, 1)

      CtrlPointDbls

      Control points for the TrimmingLoop ({0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0} Array of Doubles. Describes the corners of the square)

      UVRange

      Min and max for the U and V values ({0, 1, 0, 1} Array of Doubles)

       

  3. Sew the surfaces together into a new body using IBody2::CreateBodyFromSurfaces.

 

This example shows how to create a temporary surface using temporary bodies.

'--------------------------------------------
' Preconditions: Verify that the specified
' part document template exists.
'
' Postconditions:
' 1. Opens a new part document.
' 2. Creates a temporary body.
' 3. Creates the trimmed surfaces.
' 4. Creates a planar surface.
' 5. Adds a trimming loop to the planar surface.
' 6. Creates a trimmed surface on the body based
'    on the trimming loop.
' 7. Sews the surfaces together into a new body.
' 8. Examine the FeatureManager design tree and
'    graphics area.
'----------------------------------------------
Option Explicit
Dim swApp As SldWorks.SldWorks
Dim Model As SldWorks.ModelDoc2
Dim Part As SldWorks.PartDoc
Dim RootPoint(2) As Double
Dim Normal(2) As Double
Dim TempBody As SldWorks.Body2
Dim isGood As Boolean
Sub main()       
   'Get the SOLIDWORKS application
    Set swApp = CreateObject("SldWorks.Application")
    swApp.UserControl = True
    'Create a new blank document
    Set swModel = swApp.NewDocument("C:\ProgramData\SOLIDWORKS\SOLIDWORKS 2015\templates\part.prtdot", 0, 0, 0)
    Set Part = Model
    'Create a new temporary body in the part
    Set TempBody = Part.CreateNewBody
    If TempBody Is Nothing Then
        MsgBox "Could not create the new body."
        Exit Sub
    End If
    'Create the trimmed surfaces for a cube 1 meter per side
    'LEFT
    RootPoint(0) = 0 'X
    RootPoint(1) = 0 'Y
    RootPoint(2) = 0 'Z
    Normal(0) = 1 'X
    Normal(1) = 0 'Y
    Normal(2) = 0 'Z
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, True)
    'RIGHT
    RootPoint(0) = 1
    RootPoint(1) = 0
    RootPoint(2) = 0
    Normal(0) = 1
    Normal(1) = 0
    Normal(2) = 0
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, True)
    'BOTTOM
    RootPoint(0) = 0
    RootPoint(1) = 0
    RootPoint(2) = -1
    Normal(0) = 0
    Normal(1) = 1
    Normal(2) = 0
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, True)
    
    'TOP
    RootPoint(0) = 0
    RootPoint(1) = 1
    RootPoint(2) = -1
    Normal(0) = 0
    Normal(1) = 1
    Normal(2) = 0
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, True)
    'FRONT
    RootPoint(0) = 0
    RootPoint(1) = 0
    RootPoint(2) = 0
    Normal(0) = 0
    Normal(1) = 0
    Normal(2) = 1
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, True)
    'BACK
    RootPoint(0) = 0
    RootPoint(1) = 0
    RootPoint(2) = -1
    Normal(0) = 0
    Normal(1) = 0
    Normal(2) = 1
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, True)
    'Create the body from the trimmed surfaces just created
    TempBody.CreateBodyFromSurfaces
    'Create an offset surface from the back
    RootPoint(0) = 0
    RootPoint(1) = 0
    RootPoint(2) = -2
    Normal(0) = 0
    Normal(1) = 0
    Normal(2) = 1
    isGood = CreateSquareSurface(Part, TempBody, RootPoint, Normal, False)

    Model.ViewZoomtofit2
    'Clean up the memory
    Set swApp = Nothing
    Set Model = Nothing
    Set Part = Nothing
End Sub
 
'CreateSquareSurface creates a square trimmed surface
Private Function CreateSquareSurface(Part As PartDoc, SurfaceBody As Body2, RootPoint As Variant, Normal As Variant, IsPartOfTempBody As Boolean) As Boolean
    Dim isGood As Boolean    
    'Temporary surface
    Dim TmpSurf As SldWorks.Surface
    'Arguments that define the trimming loop
    Dim NumCurves As Long
    Dim Order(3) As Long
    Dim Dimen(3) As Long
    Dim Periodic(3) As Long
    Dim NumKnots(3) As Long
    Dim NumCtrlPoints(3) As Long
    Dim Knots(15) As Double
    Dim CtrlPointDbls(15) As Double
    Dim UVRange(3) As Double
   'Initially this function has no problems,
   'set this value to false if errors encountered
    CreateSquareSurface = True
   'Create a new planar surface based at RootPoint with the Normal vector Normal
    Set TmpSurf = SurfaceBody.CreatePlanarSurface(RootPoint, Normal)
    If TmpSurf Is Nothing Then
        CreateSquareSurface = False
        Exit Function
    End If
    'Set the arguments to define a square trimming loop
    'There are four curves (four sides)
    NumCurves = 4
    'Orders of the spline curves
    Order(0) = 2
    Order(1) = 2
    Order(2) = 2
    Order(3) = 2
    'There are two dimensions
    Dimen(0) = 2
    Dimen(1) = 2
    Dimen(2) = 2
    Dimen(3) = 2
    'No periodics
    Periodic(0) = 0
    Periodic(1) = 0
    Periodic(2) = 0
    Periodic(3) = 0
    'There are four knots (corners)
    NumKnots(0) = 4
    NumKnots(1) = 4
    NumKnots(2) = 4
    NumKnots(3) = 4
    'A square has two control points
    NumCtrlPoints(0) = 2
    NumCtrlPoints(1) = 2
    NumCtrlPoints(2) = 2
    NumCtrlPoints(3) = 2
    'The locations of the knots
    Knots(0) = 0
    Knots(1) = 0
    Knots(2) = 1
    Knots(3) = 1
    Knots(4) = 0
    Knots(5) = 0
    Knots(6) = 1
    Knots(7) = 1
    Knots(8) = 0
    Knots(9) = 0
    Knots(10) = 1
    Knots(11) = 1
    Knots(12) = 0
    Knots(13) = 0
    Knots(14) = 1
    Knots(15) = 1
   'Set the actual trimming corners
    CtrlPointDbls(0) = 0: CtrlPointDbls(1) = 0
    CtrlPointDbls(2) = 1: CtrlPointDbls(3) = 0
    CtrlPointDbls(4) = 1: CtrlPointDbls(5) = 0
    CtrlPointDbls(6) = 1: CtrlPointDbls(7) = 1
    CtrlPointDbls(8) = 1: CtrlPointDbls(9) = 1
    CtrlPointDbls(10) = 0: CtrlPointDbls(11) = 1
    CtrlPointDbls(12) = 0: CtrlPointDbls(13) = 1
    CtrlPointDbls(14) = 0: CtrlPointDbls(15) = 0
    'The possible range for the UV values
    UVRange(0) = 0
    UVRange(1) = 1
    UVRange(2) = 0
    UVRange(3) = 1
    'Create the trimming loop on the surface
    isGood = TmpSurf.AddTrimmingLoop2(NumCurves, Order, Dimen, Periodic, NumKnots, NumCtrlPoints, Knots, CtrlPointDbls, UVRange)
    If isGood = False Then
        CreateSquareSurface = False
        Exit Function
    End If

    'Create the trimmed surface on the body
    'based on the trimming loop just created
    isGood = SurfaceBody.CreateTrimmedSurface
    If isGood = False Then
        CreateSquareSurface = False
        Exit Function
    End If

    If IsPartOfTempBody Then
       'If this surface is to be used in
       'a temporary body, then you must generate it
    Else
        SurfaceBody.CreateBodyFromSurfaces
    End If
End Function


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