expression.Depth
expression Required. An expression that returns one of the objects in the Applies To list.
Remarks
Numeric values are evaluated in points; strings can be in any units supported by Microsoft Publisher (for example, "2.5 in").
Positive values produce an extrusion whose front face is the original shape; negative values produce an extrusion whose back face is the original shape. The valid range is – 600 through 9600 points, or the equivalent distance in all other units.
Example
This example adds an oval to the active publication, and then specifies that the oval be extruded to a depth of 50 points and that the extrusion be purple.
Dim shpNew As Shape
Set shpNew = ActiveDocument.Pages(1).Shapes _
.AddShape(Type:=msoShapeOval, _
Left:=90, Top:=90, Width:=90, Height:=40)
With shpNew.ThreeD
.Visible = True
.Depth = 50
.ExtrusionColor.RGB = RGB(255, 100, 255)
End With