Boolean Example

```Sub Example_Boolean()
' This example creates a box and a cylinder in model space.
' It then performs a Boolean operation on the two solids.

Dim boxObj As Acad3DSolid
Dim boxLength As Double, boxWidth As Double, boxHeight As Double
Dim boxCenter(0 To 2) As Double
boxCenter(0) = 5#: boxCenter(1) = 5#: boxCenter(2) = 0
boxLength = 10#: boxWidth = 7: boxHeight = 10#

' Create the box (3DSolid) object in model space
Set boxObj = ThisDrawing.ModelSpace.AddBox(boxCenter, boxLength, boxWidth, boxHeight)

' Define the cylinder
Dim cylinderObj As Acad3DSolid
Dim cylinderCenter(0 To 2) As Double
Dim cylinderRadius As Double
Dim cylinderHeight As Double
cylinderCenter(0) = 0#: cylinderCenter(1) = 0#: cylinderCenter(2) = 0#
cylinderRadius = 5#
cylinderHeight = 20#

' Create the Cylinder (3DSolid) object in model space
Set cylinderObj = ThisDrawing.ModelSpace.AddCylinder(cylinderCenter, cylinderRadius, cylinderHeight)

' Change the viewing direction of the viewport
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

' Perform an intersection on the two solids
MsgBox "Perform an intersection on the two solids.", vbOKOnly, "Boolean Example"
boxObj.Boolean acIntersection, cylinderObj
ThisDrawing.Regen True

MsgBox "Intersection complete.", , "Boolean Example"

End Sub
```