Entering 3D world coordinate system (WCS) coordinates is similar to entering 2D WCS coordinates.
In addition to specifying X and Y values, you specify a Z value. As with the 2D coordinates, a variant is used to pass the coordinates to ActiveX® methods and properties, and to query the coordinates.
This example creates two polylines, each with three coordinates. The first polyline is a 2D polyline, the second polyline is 3D. Notice that the length of the array containing the vertices is expanded to include the Z coordinates in the creation of the 3D polyline. The example concludes by querying the coordinates of the polylines and displaying the coordinates in a message box.
Sub Ch8_Polyline_2D_3D()
Dim pline2DObj As AcadLWPolyline
Dim pline3DObj As AcadPolyline
Dim points2D(0 To 5) As Double
Dim points3D(0 To 8) As Double
' Define three 2D polyline points
points2D(0) = 1: points2D(1) = 1
points2D(2) = 1: points2D(3) = 2
points2D(4) = 2: points2D(5) = 2
' Define three 3D polyline points
points3D(0) = 1: points3D(1) = 1: points3D(2) = 0
points3D(3) = 2: points3D(4) = 1: points3D(5) = 0
points3D(6) = 2: points3D(7) = 2: points3D(8) = 0
' Create the 2D light weight Polyline
Set pline2DObj = ThisDrawing.ModelSpace. _
AddLightWeightPolyline(points2D)
pline2DObj.Color = acRed
pline2DObj.Update
' Create the 3D polyline
Set pline3DObj = ThisDrawing.ModelSpace. _
AddPolyline(points3D)
pline3DObj.Color = acBlue
pline3DObj.Update
' Query the coordinates of the polylines
Dim get2Dpts As Variant
Dim get3Dpts As Variant
get2Dpts = pline2DObj.Coordinates
get3Dpts = pline3DObj.Coordinates
' Display the coordinates
MsgBox ("2D polyline (red): " & vbCrLf & _
get2Dpts(0) & ", " & get2Dpts(1) & vbCrLf & _
get2Dpts(2) & ", " & get2Dpts(3) & vbCrLf & _
get2Dpts(4) & ", " & get2Dpts(5))
MsgBox ("3D polyline (blue): " & vbCrLf & _
get3Dpts(0) & ", " & get3Dpts(1) & ", " & _
get3Dpts(2) & vbCrLf & _
get3Dpts(3) & ", " & get3Dpts(4) & ", " & _
get3Dpts(5) & vbCrLf & _
get3Dpts(6) & ", " & get3Dpts(7) & ", " & _
get3Dpts(8))
End Sub