Create Body using Trimmed Surfaces Example (VBA)
The basic outline for creating a body using trimmed surfaces is as follows:
Create a new temporary
body in a part using IPartDoc::CreateNewBody.
-
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).
Create
a planar surface based on a root point and normal (two, three cell VARIANT
arrays) using IBody2::CreatePlanarSurface(RootPoint, Normal).
Add a
trimming loop to the planar surface using
ISurface::AddTrimmingLoop2(Numcurves, _
Order, _
Dimen, _
Periodic, _
NumKnots, _
NumCtrlPoints, _
Knots, _
CtrlPointDbls, _
UVRange)
-
Create a trimmed surface on the body
based on the trimming loop that was just created. The arguments for Surface::AddTrimmingLoop2
are (and their values for a square):
|
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) |
Sew the surfaces together
into a new body using IBody2::CreateBodyFromSurfaces.
This example shows how to create a temporary surface using temporary
bodies.
'------------------------------------------------------------
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
Model = swApp.NewPart
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)
'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, you must generate it
Else
SurfaceBody.CreateBodyFromSurfaces
End
If
End Function