IFC 4.3.x development

8.20.3.3 IfcConnectedFaceSet

8.20.3.3.1 Semantic definitions at the entity

NOTE  Definition according to ISO/CD 10303-42:1992
A connected_face_set is a set of faces such that the domain of faces together with their bounding edges and vertices is connected.

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

HISTORY  New entity in IFC1.0

Informal Propositions:

  1. The union of the domains of the faces and their bounding loops shall be arcwise connected.

8.20.3.3.1 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
IfcConnectedFaceSet
1 CfsFaces SET [1:?] OF IfcFace The set of faces arcwise connected along common edges or vertices.

8.20.3.3.2 Entity inheritance

dot_inheritance IfcClosedShell IfcClosedShell IfcConnectedFaceSet IfcConnectedFaceSet IfcClosedShell->IfcConnectedFaceSet IfcTopologicalRepresentationItem IfcTopologicalRepresentationItem IfcConnectedFaceSet->IfcTopologicalRepresentationItem IfcOpenShell IfcOpenShell IfcOpenShell->IfcConnectedFaceSet IfcTopologicalRepresentationItem_children 6 more... IfcTopologicalRepresentationItem_children->IfcTopologicalRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcTopologicalRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.20.3.3.3 Formal representations

ENTITY IfcConnectedFaceSet
 SUPERTYPE OF (ONEOF
	(IfcClosedShell
	,IfcOpenShell))
 SUBTYPE OF (IfcTopologicalRepresentationItem);
	CfsFaces : SET [1:?] OF IfcFace;
END_ENTITY;