Defined in File Ifc4x1.h
public Ifc4x1::IfcGeometricRepresentationItem(Class Ifc4x1::IfcGeometricRepresentationItem)
public Ifc4x1::IfcMappedItem(Class Ifc4x1::IfcMappedItem)
public Ifc4x1::IfcStyledItem(Class Ifc4x1::IfcStyledItem)
public Ifc4x1::IfcTopologicalRepresentationItem(Class Ifc4x1::IfcTopologicalRepresentationItem)
IfcRepresentationItem: public IfcUtil::IfcBaseEntity¶
Definition from ISO/CD 10303-43:1992: A representation item is an element of product data that participates in one or more representations or contributes to the definition of another representation item. A representation item contributes to the definition of another representation item when it is referenced by that representation item.
NOTE Corresponding entity in ISO 10303-43:1994: representation_item. Please refer to ISO/IS 10303-43:1994, for the final definition of the formal standard. The following changes have been made: The attribute ‘name’ and the WR1 have not been incorporated.
The IfcRepresentationItem is used within an IfcRepresentation (directly or indirectly through other IfcRepresentationItem’s) to represent an IfcProductRepresentation. Most commonly these IfcRepresentationItem’s are geometric or topological representation items, that can (but not need to) have presentation style infomation assigned.
NOTE The assignment of a style is only applicable to the subtypes IfcGeometricRepresentationItem, IfcMappedItem and some selected subtypes of IfcTopologicalRepresentationItem (IfcVertexPoint, IfcEdgeCurve, IfcFaceSurface).
In case that presentation style information is applied, it can be either applied by an IfcStyledItem, or by an assignment to an IfcPresentationLayerWithStyle. If both are present, and both style assignments include the same subtype of IfcPresentationStyle, then the style assigned by IfcStyledItem takes priority.
EXAMPLE The assignment of style information by a styled item and a presentation layer with style. Since the presentation styles are different, IfcCurveStyle and IfcSurfaceStyle, both are applied to the geometric representation item.
Figure 281 — Representation item style
EXAMPLE The assignment of style information by a styled item and a presentation layer with style. Since the presentation styles for curve style are aprovided by both, the IfcCurveStyle provided by the IfcStyledItem overrides the IfcCurveStyle provided by the IfcPresentationLayerWithStyle
Figure 282 — Representation item style override
HISTORY New entity in IFC Release 2x.
IFC2x3 CHANGE The inverse attributes StyledByItem and LayerAssignments have been added. Upward compatibility for file based exchange is guaranteed.