[IfcLightSourceSpot.SpreadAngle property SpreadAngle public IfcPositivePlaneAngleMeasure SpreadAngle { get; set; } 也可以看看 class IfcPositivePlaneAngleMeasure class IfcLightSourceSpot 命名空间 Aspose.CAD.FileFormats.Ifc.IFC4.Entities 部件 Aspose.CAD]
