IFC 4.3.x development

8.20.3.8 IfcFaceBound

Change log

IFC4

modificationsattributes Orientation definitionChanged from boolean to IfcBoolean

8.20.3.8.1 Semantic definitions at the entity

NOTE  Definition according to ISO/CD 10303-42:1992
A face bound is a loop which is intended to be used for bounding a face.

NOTE  Entity adapted from face_bound defined in ISO 10303-42.

HISTORY  New entity in IFC1.0

8.20.3.8.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.



> IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
IfcTopologicalRepresentationItem
IfcFaceBound
1 Bound IfcLoop The loop which will be used as a face boundary.
2 Orientation IfcBoolean This indicated whether (TRUE) or not (FALSE) the loop has the same sense when used to bound the face as when first defined. If sense is FALSE the senses of all its component oriented edges are implicitly reversed when used in the face.

8.20.3.8.2 Entity inheritance

dot_inheritance IfcFaceOuterBound IfcFaceOuterBound IfcFaceBound IfcFaceBound IfcFaceOuterBound->IfcFaceBound IfcTopologicalRepresentationItem IfcTopologicalRepresentationItem IfcFaceBound->IfcTopologicalRepresentationItem IfcTopologicalRepresentationItem_children 6 more... IfcTopologicalRepresentationItem_children->IfcTopologicalRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcTopologicalRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.20.3.8.3 Formal representations

ENTITY IfcFaceBound
 SUPERTYPE OF (ONEOF
	(IfcFaceOuterBound))
 SUBTYPE OF (IfcTopologicalRepresentationItem);
	Bound : IfcLoop;
	Orientation : IfcBoolean;
END_ENTITY;