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Get Normal of Planar Surface Example (VBA)

This example shows how to the normal parameters of a planar surface.

' Preconditions:
' 1. Open a part, assembly, or drawing.
' 2. Select a face on a planar surface.
' 3. Open the Immediate window.
' Postconditions: Examine the Immediate window.
' NOTE: The normal of a surface (ISurface::PlaneParams)
' cannot be in the same direction as the normal
' of the face (IFace2::Normal).
Option Explicit
Sub main()
    Dim swApp As SldWorks.SldWorks
    Dim swModel As SldWorks.ModelDoc2
    Dim swSelMgr As SldWorks.SelectionMgr
    Dim swFace As SldWorks.Face2
    Dim swSurf As SldWorks.Surface
    Dim vPlaneParam As Variant
    Dim vFaceNorm As Variant
    Set swApp = Application.SldWorks
    Set swModel = swApp.ActiveDoc
    Set swSelMgr = swModel.SelectionManager
    Set swFace = swSelMgr.GetSelectedObject5(1)
    Set swSurf = swFace.GetSurface: Debug.Assert swSurf.IsPlane
    vPlaneParam = swSurf.PlaneParams
    vFaceNorm = swFace.Normal
    Debug.Print "File = " & swModel.GetPathName
    Debug.Print "  Surface"
    Debug.Print "    normal               = (" & vPlaneParam(0) & ", " & vPlaneParam(1) & ", " & vPlaneParam(2) & ")"
    Debug.Print "    root                 = (" & vPlaneParam(3) * 1000# & ", " & vPlaneParam(4) * 1000# & ", " & vPlaneParam(5) * 1000# & ") mm"
    Debug.Print "  Face"
    Debug.Print "    normal               = (" & vFaceNorm(0) & ", " & vFaceNorm(1) & ", " & vFaceNorm(2) & ")"
    Debug.Print "    true if face normal and surface normal in opposite direction, false if in same direction = " & swFace.FaceInSurfaceSense
End Sub

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