Using Programming Languages other than VBA

Sub Example_PrincipalDirections()
	' This example creates a box in model space.
	' It then returns the PrincipalDirections for that box.
		
	Dim boxObj As Acad3DSolid
	Dim length As Double, width As Double, height As Double
	Dim center(0 To 2) As Double

	' Define the box
	center(0) = 5#: center(1) = 5#: center(2) = 0
	length = 5#: width = 7: height = 10#

	' Create the box (3DSolid) object in model space
	Set boxObj = ThisDrawing.ModelSpace.AddBox(center, length, width, height)

	' Change the viewing direction of the viewport to better see the box
	Dim NewDirection(0 To 2) As Double
	NewDirection(0) = -1: NewDirection(1) = -1: NewDirection(2) = 1
	ThisDrawing.ActiveViewport.direction = NewDirection
	ThisDrawing.ActiveViewport = ThisDrawing.ActiveViewport
	ZoomAll

	' Return the PrincipalDirections for the box
	Dim PrincipalDirections As Variant
	PrincipalDirections = boxObj.PrincipalDirections
	MsgBox "The PrincipalDirections for the box are " & PrincipalDirections(0) & ", " & PrincipalDirections(1) & ", " & PrincipalDirections(2), , "PrincipalDirections Example"
	
End Sub