IfcDirectrixCurveSweptAreaSolid

Natural language names
Change log
ItemSPFXMLChangeDescription
IFC4x2 to IFC4x3_RC1
    IfcDirectrixCurveSweptAreaSolidADDED
Semantic definitions at the entity
Entity definition

An abstract entity defining common information about a type of swept area solid which is the result of sweeping an area along a Directrix. The swept area is provided by a subtype of IfcProfileDef. The profile is placed by an implicit cartesian transformation operator at the start point of the sweep, where the profile normal agrees to the tangent of the directrix at this point. The direction of profile�s x-axis is specialized by the subtypes of IfcDirextrixCurveSweptAreaSolid. The start of the sweeping operation is at the StartParam, the parameter value is provided based on the curve parameterization. If no StartParam is provided the start defaults to the begin of the directrix. The end of the sweeping operation is at the EndParam, the parameter value is provided based on the curve parameterization. If no EndParam is provided the end defaults to the end of the directrix.

Attribute definitions
#AttributeTypeCardinalityDescription G
3DirectrixIfcCurve The curve used to define the sweeping operation. The solid is generated by sweeping the SELF\IfcSweptAreaSolid.SweptArea along the Directrix. X
4StartParamIfcParameterValue? The parameter value on the Directrix at which the sweeping operation commences. If no value is provided the start of the sweeping operation is at the start of the Directrix. X
5EndParamIfcParameterValue? The parameter value on the Directrix at which the sweeping operation ends. If no value is provided the end of the sweeping operation is at the end of the Directrix. X
Formal Propositions
RuleDescription
DirectrixBoundedIf the values for StartParam or EndParam are omited, then the Directrix has to be a bounded or closed curve.
Inherited definitions from supertypes
Entity inheritance IfcFixedReferenceSweptAreaSolid IfcSurfaceCurveSweptAreaSolid 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
IfcDirectrixCurveSweptAreaSolid
3DirectrixIfcCurve The curve used to define the sweeping operation. The solid is generated by sweeping the SELF\IfcSweptAreaSolid.SweptArea along the Directrix. X
4StartParamIfcParameterValue? The parameter value on the Directrix at which the sweeping operation commences. If no value is provided the start of the sweeping operation is at the start of the Directrix. X
5EndParamIfcParameterValue? The parameter value on the Directrix at which the sweeping operation ends. If no value is provided the end of the sweeping operation is at the end of the Directrix. X
Formal representations
XML Specification
 <xs:element name="IfcDirectrixCurveSweptAreaSolid" type="ifc:IfcDirectrixCurveSweptAreaSolid" abstract="true" substitutionGroup="ifc:IfcSweptAreaSolid" nillable="true"/>
 <xs:complexType name="IfcDirectrixCurveSweptAreaSolid" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcSweptAreaSolid">
    <xs:sequence>
     <xs:element name="Directrix" type="ifc:IfcCurve" nillable="true"/>
    </xs:sequence>
    <xs:attribute name="StartParam" type="ifc:IfcParameterValue" use="optional"/>
    <xs:attribute name="EndParam" type="ifc:IfcParameterValue" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcDirectrixCurveSweptAreaSolid
 ABSTRACT SUPERTYPE OF(ONEOF(IfcFixedReferenceSweptAreaSolid, IfcSurfaceCurveSweptAreaSolid))
 SUBTYPE OF (IfcSweptAreaSolid);
  Directrix : IfcCurve;
  StartParam : OPTIONAL IfcParameterValue;
  EndParam : OPTIONAL IfcParameterValue;
 WHERE
  DirectrixBounded : (EXISTS(StartParam) AND EXISTS(EndParam)) OR
(SIZEOF(['IFCGEOMETRYRESOURCE.IfcConic', 'IFCGEOMETRYRESOURCE.IfcBoundedCurve'] * TYPEOF(Directrix)) = 1);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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