This SOLIDWORKS API example reads the transform of the selected circular pattern and creates a temp preview of the pattern of the specified seed body by applying the same transform as in the circular pattern.

Copy of the body created emulating the circular pattern feature
Copy of the body created emulating the circular pattern feature
  • Select circular pattern feature as a first selected object
    • It must use reference axis as the directionSelect any solid body which is not a part of the circular pattern feature
  • Run the macro. Macro will read the transformation from the pattern and apply the same transformation to the body selected in previous step. The preview will be displayed using temporarily bodies which will be destroyed immediately when macro resumes execution (i.e. F5 or run).
  • There won’t be any temp features created or removed during the run of this macro
Dim swApp As SldWorks.SldWorks
Dim swModel As SldWorks.ModelDoc2
Dim swMathUtils As SldWorks.MathUtility
Dim swSelMgr As SldWorks.SelectionMgr

Sub main()

    Set swApp = Application.SldWorks
    Set swModel = swApp.ActiveDoc
    Set swMathUtils = swApp.GetMathUtility
    Set swSelMgr = swModel.SelectionManager
    Dim swFeat As SldWorks.Feature
    Dim swBody As SldWorks.Body2
    Dim swCircPatt As SldWorks.CircularPatternFeatureData
    Set swFeat = swSelMgr.GetSelectedObject6(1, -1)
    If Not swFeat Is Nothing Then
        If swFeat.GetTypeName2 = "CirPattern" Then
            Set swCircPatt = swFeat.GetDefinition
        End If
    End If
    Set swBody = swSelMgr.GetSelectedObject6(2, -1)
    If swBody Is Nothing Then
        MsgBox "Please select body to pattern as second selection"
    End If
    If Not swCircPatt Is Nothing Then
        Dim angle As Double
        Dim swOrigPt As SldWorks.MathPoint
        Dim swDirVec As SldWorks.MathVector
        Dim instances As Integer
        Dim vPreviewBodies As Variant
        GetCircularPatternParameters swCircPatt, swOrigPt, swDirVec, angle, instances
        vPreviewBodies = CreateCircularPatternPreview(swBody, swOrigPt, swDirVec, angle, instances)
        ClearTempBodies vPreviewBodies
        MsgBox "Please select the circular pattern feature as first selection"
    End If
End Sub

Sub GetCircularPatternParameters(swCircPatt As SldWorks.CircularPatternFeatureData, ByRef swOrigPt As MathPoint, ByRef swDirVec As MathVector, ByRef angle As Double, ByRef instances As Integer)
    swCircPatt.AccessSelections swModel, Nothing
    If swCircPatt.EqualSpacing Then
        angle = swCircPatt.Spacing / (swCircPatt.TotalInstances - 1)
        angle = swCircPatt.Spacing
    End If
    If swCircPatt.ReverseDirection Then
        angle = -angle
    End If
    instances = swCircPatt.TotalInstances - 2
    Dim swAxis As SldWorks.RefAxis
    Set swAxis = swCircPatt.Axis
    If swAxis Is Nothing Then
        MsgBox "Only reference axis is supported as the direction"
    End If
    Dim vVec As Variant
    vVec = swAxis.GetRefAxisParams
    Dim dData(2) As Double
    dData(0) = vVec(0):  dData(1) = vVec(1): dData(2) = vVec(2)
    Set swOrigPt = swMathUtils.CreatePoint(dData)
    dData(0) = vVec(3) - vVec(0):  dData(1) = vVec(4) - vVec(1): dData(2) = vVec(5) - vVec(2)
    Set swDirVec = swMathUtils.CreateVector(dData)
End Sub

Function CreateCircularPatternPreview(swBody As SldWorks.Body2, swOrigPt As MathPoint, swDirVec As MathVector, angle As Double, instances As Integer) As Variant
    Dim swPreviewBodies() As SldWorks.Body2
    ReDim swPreviewBodies(instances)
    Dim i As Integer
    For i = 0 To instances
        Dim swTransform As SldWorks.MathTransform

        Set swTransform = swMathUtils.CreateTransformRotateAxis(swOrigPt, swDirVec, angle * (i + 1))
        Set swPreviewBodies(i) = swBody.Copy
        swPreviewBodies(i).ApplyTransform swTransform
        swPreviewBodies(i).Display3 swModel, RGB(0, 0, 255), swTempBodySelectOptions_e.swTempBodySelectOptionNone
    CreateCircularPatternPreview = swPreviewBodies
End Function

Sub ClearTempBodies(vBodies As Variant)
    Dim i As Integer

    For i = 0 To UBound(vBodies)
        Set vBodies(i) = Nothing
End Sub