Namespace Xbim.Ifc4.PresentationOrganizationResource Classes IfcLightDistributionData IfcLightIntensityDistribution IfcLightSource IfcLightSourceAmbient IfcLightSourceDirectional IfcLightSourceGoniometric IfcLightSourcePositional IfcLightSourceSpot IfcPresentationLayerAssignment IfcPresentationLayerWithStyle Interfaces IfcLayeredItem IfcLightDistributionDataSourceSelect Enums IfcPresentationLayerAssignment.IfcPresentationLayerAssignmentClause IfcPresentationLayerWithStyle.IfcPresentationLayerWithStyleClause