IfcConnectedFaceSet

BACnet MVD

#### IfcConnectedFaceSet

Natural language names

| Gruppe verbundender Flächen
| Connected Face Set
| Ensemble de faces connectées

##### Semantic definitions at the entity

Entity definition

> 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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | CfsFaces | IfcFace | S[1:?] | The set of faces arcwise connected along common edges or vertices. | X | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentationItem

LayerAssignment

IfcPresentationLayerAssignment
@AssignedItems

S[0:1]

Assignment 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.

X

StyledByItem

IfcStyledItem
@Item

S[0:1]

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.

X

X

IfcTopologicalRepresentationItem
IfcConnectedFaceSet
1 | CfsFaces | IfcFace | S[1:?] | The set of faces arcwise connected along common edges or vertices. | X | X

##### Formal representations

XML Specification
`<xs:element name="IfcConnectedFaceSet" type="ifc:IfcConnectedFaceSet" substitutionGroup="ifc:IfcTopologicalRepresentationItem" nillable="true"/>
<xs:complexType name="IfcConnectedFaceSet">
<xs:complexContent>
<xs:extension base="ifc:IfcTopologicalRepresentationItem">
<xs:sequence>
<xs:element name="CfsFaces">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcFace" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcFace"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcConnectedFaceSet
SUPERTYPE OF(ONEOF(IfcClosedShell, IfcOpenShell))
SUBTYPE OF (IfcTopologicalRepresentationItem);
CfsFaces : SET [1:?] OF IfcFace;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcFaceBasedSurfaceModel

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