How to realize 3d Offset?

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gilseorin:
Thanks for the data.
Just 2d offset adding Z value inputed.
Build my code and excute it, then understanded easily.

gilseorin:
Dim DrOpt As PromptPointOptions = New PromptPointOptions("" & Microsoft.VisualBasic.Chr(10) & "Specify Offset Direction: ")
Dim Dres As PromptPointResult = Ed.GetPoint(DrOpt)

Is any method of how the program know where the user picked the point?
Left,right,above or below of the polyline?
If it is closed, in or out? Thanks.

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