IPolygon3D_DG Interface
A polygon in 3D defined by an array of points. It is considered closed is the first and the last points coinside geometrically (tolerance 1e6).
Polygons are often used to approximate a curve, in which case the GetParameters() may contain array of parameters on the curve.
A standalone 3D polygon can be created with a IObjectGenerator_DG.Create<IPolygon3D_DG>() call.
Implements also: IObjectOriented_DG, IObject_DG.
Properties
 IPointArray_DG Points
 IArrayDouble_DG Parameters
Methods
 GetPointCount
 IsClosed
int GetPointCount()
bool IsClosed()
Returns true if the first and the last points are closer than 1e6.
