Defined in File Ifc4.h
IfcRelProjectsElement: public Ifc4::IfcRelDecomposes¶
The IfcRelProjectsElement is an objectified relationship between an element and one projection element that creates a modifier to the shape of the element. The relationship is defined to be a 1:1 relationship, if an element has more than one projection, several relationship objects have to be used, each pointing to a different projection element. The IfcRelProjectsElement establishes an aggregation relationship between the main element and a sub ordinary addition feature.
NOTE In contrary the IfcRelAggregates relationship established an aggregation of equal parts to a whole.
The IfcRelProjectsElement implies a Boolean operation of addition for the geometric bodies of the element and the feature element. As with all decomposition relationships it determines:
existence dependency - the RelatedFeatureElement cannot exist without the RelatingElement hierarchical and non-cyclical relationship - the IfcRelProjectsElement can only alter a single IfcElement no spatial containment - the IfcFeatureElementAddition as related element never participates in the hiearchical spatial containment relationship IfcRelContainedInSpatialStructure
HISTORY New entity in Release IFC2x Edition 2. IFC2x4 CHANGE Supertype changed to IfcRelDecomposes.
Element at which a projection is created by the associated IfcProjectionElement.
Reference to the IfcFeatureElementAddition that defines an addition to the volume of the element, by using a Boolean addition operation. An example is a projection at the associated element.
- ::Ifc4::IfcElement *