Share Email Facebook Twitter LinkedIn ConicalSurface.HalfAngle Property Cone angle. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public double HalfAngle { get; }Property ValueDouble See AlsoReferenceConicalSurface ClassAutodesk.Revit.DB Namespace