This .NET class wraps the AcGeAugPolyline3d ObjectARX class. It represents a mathematical entity used to support different types of spline curves in 3D space.

Autodesk.AutoCAD.Geometry.Entity3d
    Autodesk.AutoCAD.Geometry.Curve3d
        Autodesk.AutoCAD.Geometry.SplineEntity3d
            Autodesk.AutoCAD.Geometry.PolylineCurve3d
                Autodesk.AutoCAD.Geometry.AugmentedPolylineCurve3d

Public sealed Class AugmentedPolylineCurve3d
Inherits PolylineCurve3d

public sealed class AugmentedPolylineCurve3d : PolylineCurve3d;