Boundary Representation mit Aussparungen - NURBS | |
Advanced Brep With Voids | |
Représentation frontière avancée avec trous |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcAdvancedBrepWithVoids | ADDED |
The IfcAdvancedBrepWithVoids is a specialization of an advanced B-rep which contains one or more voids in its interior. The voids are represented as closed shells which are defined so that the shell normal point into the void.
NOTE Entity adapted from advanced_brep_shape_representation defined in ISO 10303-42.
HISTORY New entity in IFC4
Informal Propositions:
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
2 | Voids | IfcClosedShell | S[1:?] | X |
Rule | Description |
---|---|
VoidsHaveAdvancedFaces | Each face of the voids within the advanced B-rep with voids shall be of type IfcAdvancedFace. |
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
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. | 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. | X | |
IfcGeometricRepresentationItem | |||||
IfcSolidModel | |||||
Dim :=3 | IfcDimensionCount | [1:1] | The space dimensionality of this class, it is always 3. | X | |
IfcManifoldSolidBrep | |||||
1 | Outer | IfcClosedShell | [1:1] | A closed shell defining the exterior boundary of the solid. The shell normal shall point away from the interior of the solid. | X |
IfcAdvancedBrep | |||||
IfcAdvancedBrepWithVoids | |||||
2 | Voids | IfcClosedShell | S[1:?] | X |
<xs:element name="IfcAdvancedBrepWithVoids" type="ifc:IfcAdvancedBrepWithVoids" substitutionGroup="ifc:IfcAdvancedBrep" nillable="true"/>
<xs:complexType name="IfcAdvancedBrepWithVoids">
<xs:complexContent>
<xs:extension base="ifc:IfcAdvancedBrep">
<xs:sequence>
<xs:element name="Voids">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcClosedShell" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcClosedShell"/>
<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>
ENTITY IfcAdvancedBrepWithVoids
SUBTYPE OF (IfcAdvancedBrep);
Voids : SET [1:?] OF IfcClosedShell;
WHERE
VoidsHaveAdvancedFaces : SIZEOF (QUERY (Vsh <* Voids |
SIZEOF (QUERY (Afs <* Vsh.CfsFaces |
(NOT ('IFCTOPOLOGYRESOURCE.IFCADVANCEDFACE' IN TYPEOF(Afs)))
)) = 0
)) = 0;
END_ENTITY;