FAQ 003427 EN

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6 August 2019

003427

Thomas Günthel

Modeling | Structure

How can I create NURBS with the COM interface?

Answer

The main object is not a line object, but an object of the NurbSpline type.

Here is a short example for creating a NURBS (Non-Uniform Rational B-Spline):

'------------------------------------------------- -------------------------------------------------

Sub nurbs_test ()

'------------------------------------------------- -------------------------------------------------

Dim model As RFEM5.model

Set model = GetObject (, "RFEM5.Model")

model.GetApplication.LockLicense

On Error GoTo e

Dim data As IModelData

Set data = model.GetModelData

'define array of nodes

Dim nodes (0 To 2) As RFEM5.Node

nodes (0) .No = 1

nodes (0) .Type = Default

nodes (0) .CS = Cartesian

nodes (0) .X = 1

nodes (0) .Y = 1

nodes (0) .Z = 0

nodes (1) .No = 2

nodes (1) .Type = Default

nodes (1) .CS = Cartesian

nodes (1) .X = 2

nodes (1) .Y = 1

nodes (1) .Z = -1

nodes (2) .No = 3

nodes (2) .Type = Default

nodes (2) .CS = Cartesian

nodes (2) .RefObjectNo = 2

nodes (2) .X = 0

nodes (2) .Y = 1

nodes (2) .Z = 0

Dim darr1 (0 To 5) As Double

darr1 (0) = 1

darr1 (1) = 2

darr1 (2) = 3

darr1 (3) = 4

darr1 (4) = 5

darr1 (5) = 6

Dim darr2 (0 To 2) As Double

darr2 (0) = 1

darr2 (1) = 1

darr2 (2) = 1

Dim ns As NurbSpline

ns.General.No = 2

ns.General.Type = NurbSplineType

ns.General.NodeList = "1,2,3"

ns.General.Comment = "line 2"

ns.Knots = darr1

ns.Order = 3

ns.Weights = darr2

data.PrepareModification

data.SetNodes nodes

data.SetNurbSpline ns

e: data.FinishModification

If Err.Number <> 0 Then MsgBox Err.Description,, Err.Source

Set data = Nothing

model.GetApplication.UnlockLicense

Set model = Nothing

End Sub

Keywords

NURBS Spline COM

Downloads

VBA Macro for Creating NURBS Splines

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