IfcExtrudedAreaSolidTapered

Natural language names
Sich verjüngender Festkörper - aus extrudierter Fläche
Extruded Area Solid Tapered
Change log
ItemSPFXMLChangeDescription
4.0.0.0
    IfcExtrudedAreaSolidTaperedADDED
Semantic definitions at the entity
Entity definition

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:

  1. Mirroring within IfcDerivedProfileDef.Operator shall not be used
Attribute definitions
#AttributeTypeCardinalityDescription G
5EndSweptAreaIfcProfileDef 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
Formal Propositions
RuleDescription
CorrectProfileAssignmentThe SweptArea as start profile and the EndSweptArea as end profile shall be compatible.
Inherited definitions from supertypes
Entity inheritance IfcExtrudedAreaSolid IfcSweptAreaSolid IfcSolidModel IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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
StyledByItemIfcStyledItem
@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
IfcGeometricRepresentationItem
IfcSolidModel
Dim
:=3
IfcDimensionCountThe space dimensionality of this class, it is always 3. X
IfcSweptAreaSolid
1SweptAreaIfcProfileDef 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
2PositionIfcAxis2Placement3D? 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.
IFC4 CHANGE  The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.
X
IfcExtrudedAreaSolid
3ExtrudedDirectionIfcDirection The direction in which the surface, provided by SweptArea is to be swept.X
4DepthIfcPositiveLengthMeasure The distance the surface is to be swept along the ExtrudedDirection.X
IfcExtrudedAreaSolidTapered
5EndSweptAreaIfcProfileDef 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
Examples
Formal representations
XML Specification
 <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>
EXPRESS Specification
ENTITY IfcExtrudedAreaSolidTapered
 SUBTYPE OF (IfcExtrudedAreaSolid);
  EndSweptArea : IfcProfileDef;
 WHERE
  CorrectProfileAssignment : IfcTaperedSweptAreaProfiles(SELF\IfcSweptAreaSolid.SweptArea, SELF.EndSweptArea);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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