Namespace Xbim.Ifc2x3.PresentationOrganizationResource Classes IfcLightDistributionData IfcLightIntensityDistribution IfcLightSource IfcLightSourceAmbient IfcLightSourceDirectional IfcLightSourceGoniometric IfcLightSourcePositional IfcLightSourceSpot IfcPresentationLayerAssignment IfcPresentationLayerWithStyle Interfaces IfcLayeredItem IfcLightDistributionDataSourceSelect Enums IfcLightDistributionCurveEnum IfcLightEmissionSourceEnum