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Get Part Bounding Box Example (VBA)

This example shows how to get an accurate bounding box for a open part.

 

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

'

' Problem:

'       IPartDoc::GetPartBox returns an approximate

'       bounding box and cannot be relied upon to be used

'       in calculations. Typically, the bounding box

'       returned is larger and not a minimal bounding box.

'       The best use for IPartDoc::GetPartbox is as a first

'       approximation to determine whether two parts are intersecting.

'

'       If there is a need for a more accurate bounding

'       box, then use one based on the display tessellation, which

'       gives a more minimal bounding box.

'

' Preconditions: Part is open.

'

' Postconditions: None

'

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

 

Option Explicit

 

Function GetMax _

( _

    Val1 As Double, _

    Val2 As Double, _

    Val3 As Double, _

    Val4 As Double _

) As Double

' Finds maximum of four values

    GetMax = Val1

    

    If Val2 > GetMax Then

        GetMax = Val2

    End If

    If Val3 > GetMax Then

        GetMax = Val3

    End If

    If Val4 > GetMax Then

        GetMax = Val4

    End If

End Function

Function GetMin _

( _

    Val1 As Double, _

    Val2 As Double, _

    Val3 As Double, _

    Val4 As Double _

) As Double

' Finds minimum of four values

    GetMin = Val1

    

    If Val2 < GetMin Then

        GetMin = Val2

    End If

    If Val3 < GetMin Then

        GetMin = Val3

    End If

    If Val4 < GetMin Then

        GetMin = Val4

    End If

End Function

Sub ProcessTessTriangles _

( _

    vTessTriangles As Variant, _

    X_max As Double, _

    X_min As Double, _

    Y_max As Double, _

    Y_min As Double, _

    Z_max As Double, _

    Z_min As Double _

)

    Dim i                   As Long

    For i = 0 To UBound(vTessTriangles) / (1 * 9) - 1

'        ' Debugging output only

'        Debug.Print "Pt(" + Str(i) + ") = "

'        Debug.Print " (" + _

'            Str(vTessTriangles(9 * i + 0)) + "," + _

'            Str(vTessTriangles(9 * i + 1)) + "," + _

'            Str(vTessTriangles(9 * i + 2)) + ")"

'        Debug.Print " (" + _

'            Str(vTessTriangles(9 * i + 3)) + "," + _

'            Str(vTessTriangles(9 * i + 4)) + "," + _

'            Str(vTessTriangles(9 * i + 5)) + ")"

'        Debug.Print " (" + _

'            Str(vTessTriangles(9 * i + 6)) + "," + _

'            Str(vTessTriangles(9 * i + 7)) + "," + _

'            Str(vTessTriangles(9 * i + 8)) + ")"

            

        X_max = GetMax((vTessTriangles(9 * i + 0)), (vTessTriangles(9 * i + 3)), (vTessTriangles(9 * i + 6)), X_max)

        X_min = GetMin((vTessTriangles(9 * i + 0)), (vTessTriangles(9 * i + 3)), (vTessTriangles(9 * i + 6)), X_min)

        

        Y_max = GetMax((vTessTriangles(9 * i + 1)), (vTessTriangles(9 * i + 4)), (vTessTriangles(9 * i + 7)), Y_max)

        Y_min = GetMin((vTessTriangles(9 * i + 1)), (vTessTriangles(9 * i + 4)), (vTessTriangles(9 * i + 7)), Y_min)

        

        Z_max = GetMax((vTessTriangles(9 * i + 2)), (vTessTriangles(9 * i + 5)), (vTessTriangles(9 * i + 8)), Z_max)

        Z_min = GetMin((vTessTriangles(9 * i + 2)), (vTessTriangles(9 * i + 5)), (vTessTriangles(9 * i + 8)), Z_min)

    Next i

End Sub

Sub ProcessBodies _

( _

    vBodies As Variant, _

    X_max As Double, _

    X_min As Double, _

    Y_max As Double, _

    Y_min As Double, _

    Z_max As Double, _

    Z_min As Double _

)

    Dim swBody              As SldWorks.body2

    Dim swFace              As SldWorks.face2

    Dim vTessTriangles      As Variant

    Dim i                   As Long

    

    ' Probably empty if no reference surfaces

    If IsEmpty(vBodies) Then Exit Sub

    

    For i = 0 To UBound(vBodies)

        Set swBody = vBodies(i)

        Set swFace = swBody.GetFirstFace

        While Not swFace Is Nothing

            vTessTriangles = swFace.GetTessTriangles(True)

            ProcessTessTriangles vTessTriangles, X_max, X_min, Y_max, Y_min, Z_max, Z_min

            

            Set swFace = swFace.GetNextFace

        Wend

    Next i

End Sub

Sub main()

    Const MaxDouble         As Double = 1.79769313486231E+308

    Const MinDouble         As Double = -1.79769313486231E+308

    Dim swApp               As SldWorks.SldWorks

    Dim swModel             As SldWorks.ModelDoc2

    Dim swPart              As SldWorks.PartDoc

    Dim vBodies             As Variant

    Dim vBoundBox           As Variant

    Dim X_max               As Double

    Dim X_min               As Double

    Dim Y_max               As Double

    Dim Y_min               As Double

    Dim Z_max               As Double

    Dim Z_min               As Double

    Dim i                   As Long

    

    Set swApp = CreateObject("SldWorks.Application")

    Set swModel = swApp.ActiveDoc

    Set swPart = swModel

    

    ' Initialise to large/small values

    X_max = MinDouble

    X_min = MaxDouble

    Y_max = MinDouble

    Y_min = MaxDouble

    Z_max = MinDouble

    Z_min = MaxDouble

    

    ' Solid body

    vBodies = swPart.GetBodies2(swSolidBody, False)

    ProcessBodies vBodies, X_max, X_min, Y_max, Y_min, Z_max, Z_min

    

    ' Reference surfaces

    vBodies = swPart.GetBodies2(swSheetBody, False)

    ProcessBodies vBodies, X_max, X_min, Y_max, Y_min, Z_max, Z_min

    

    ' Approximate bounding box

    vBoundBox = swPart.GetPartBox(True)

    Debug.Print "Tessellation Quality = " + Str(swModel.GetTessellationQuality)

    Debug.Print ""

    

    Debug.Print "PartBox = "

    Debug.Print "  (" + _

                    Str(vBoundBox(0) * 1000#) + "," + _

                    Str(vBoundBox(1) * 1000#) + "," + _

                    Str(vBoundBox(2) * 1000#) + ") mm"

    Debug.Print "  (" + _

                    Str(vBoundBox(3) * 1000#) + "," + _

                    Str(vBoundBox(4) * 1000#) + "," + _

                    Str(vBoundBox(5) * 1000#) + ") mm"

    Debug.Print ""

    

    Debug.Print "TessBox = "

    Debug.Print "  (" + _

                    Str(X_min * 1000#) + "," + _

                    Str(Y_min * 1000#) + "," + _

                    Str(Z_min * 1000#) + ") mm"

    Debug.Print "  (" + _

                    Str(X_max * 1000#) + "," + _

                    Str(Y_max * 1000#) + "," + _

                    Str(Z_max * 1000#) + ") mm"

    Debug.Print ""

End Sub

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



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