Revit 2018 APIArc..::..YDirection Property Arc Class See Also Returns the Y direction.Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0)SyntaxC#public XYZ YDirection { get; }Visual BasicPublic ReadOnly Property YDirection As XYZ GetVisual C++public: property XYZ^ YDirection { XYZ^ get (); }See AlsoArc ClassAutodesk.Revit.DB Namespace