Sich verjüngender Festkörper - aus extrudierter Fläche | |
Extruded Area Solid Tapered |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcExtrudedAreaSolidTapered | ADDED |
IfcExtrudedAreaSolidTapered is defined by sweeping a cross section along a linear spine. The cross section may change along the sweep from the shape of the start cross section into the shape of the end cross section. The resulting solid is bounded by three or more faces: A start face, an end face (each defined by start and end planes and sections), and one or more lateral faces. Each lateral face is a ruled surface defined by a pair of corresponding edges of the start and end section.
NOTE Given that the start and end section is provided by a polygon, the corresponding vertices of the start and end cross section are connected, forming a quadrilateral polygon between each pair of corresponding vertices. The surface defined by the bounding quadrilateral polygon is a ruled surface, that could be approximated by triangulation.
The linear spine is defined by:
The start cross section is defined by SELF\IfcSweptAreaSolid.SweptArea:
The end cross section is defined by EndSweptArea:
In case of two parameterized profiles the shape is constructed as follows:
In case of Cartesian transformation of the start cross section the shape is constructed as follows:
HISTORY New entity in IFC4.
Informal Propositions:
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
5 | EndSweptArea | IfcProfileDef | [1:1] | The surface defining the end of the swept area. It is given as a profile definition. The position coordinate system of the EndSwptArea is generated by translating the SELF\IfcSweptAreaSolid.Position along the SELF\IfcExtrudedAreaSolid.ExtrudedDirection by the distance of SELF\IfcExtrudedAreaSolid.Depth. | X |
Rule | Description |
---|---|
CorrectProfileAssignment | The SweptArea as start profile and the EndSweptArea as end profile shall be compatible. |
# | 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 | |
IfcSweptAreaSolid | |||||
1 | SweptArea | IfcProfileDef | [1:1] | The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system. | X |
2 | Position | IfcAxis2Placement3D | [0:1] | Position coordinate system for the resulting swept solid of the sweeping operation. The position coordinate system allows for re-positioning of the swept solid. If not provided, the swept solid remains within the position as determined by the cross section or by the directrix used for the sweeping operation. | X |
IfcExtrudedAreaSolid | |||||
3 | ExtrudedDirection | IfcDirection | [1:1] | The direction in which the surface, provided by SweptArea is to be swept. | X |
4 | Depth | IfcPositiveLengthMeasure | [1:1] | The distance the surface is to be swept along the ExtrudedDirection. | X |
IfcExtrudedAreaSolidTapered | |||||
5 | EndSweptArea | IfcProfileDef | [1:1] | The surface defining the end of the swept area. It is given as a profile definition. The position coordinate system of the EndSwptArea is generated by translating the SELF\IfcSweptAreaSolid.Position along the SELF\IfcExtrudedAreaSolid.ExtrudedDirection by the distance of SELF\IfcExtrudedAreaSolid.Depth. | X |
<xs:element name="IfcExtrudedAreaSolidTapered" type="ifc:IfcExtrudedAreaSolidTapered" substitutionGroup="ifc:IfcExtrudedAreaSolid" nillable="true"/>
<xs:complexType name="IfcExtrudedAreaSolidTapered">
<xs:complexContent>
<xs:extension base="ifc:IfcExtrudedAreaSolid">
<xs:sequence>
<xs:element name="EndSweptArea" type="ifc:IfcProfileDef" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcExtrudedAreaSolidTapered
SUBTYPE OF (IfcExtrudedAreaSolid);
EndSweptArea : IfcProfileDef;
WHERE
CorrectProfileAssignment : IfcTaperedSweptAreaProfiles(SELF\IfcSweptAreaSolid.SweptArea, SELF.EndSweptArea);
END_ENTITY;