# 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
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 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)

3. 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

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

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