IfcReparametrisedCompositeCurveSegment

Natural language names
Reparametrisiertes Segment einer zusammengesetzten Kurve
Reparametrised Composite Curve Segment
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcReparametrisedCompositeCurveSegmentADDED
IFC4 Addendum 1 4.0.1.0
    IfcReparametrisedCompositeCurveSegment
      SameSenseMODIFIEDType changed from BOOLEAN to IfcBoolean.
IFC2x3 to IFC4 4.0.0.0
    IfcReparametrisedCompositeCurveSegmentADDED
IFC4 Addendum 1 4.0.1.0
    IfcReparametrisedCompositeCurveSegment
      SameSenseMODIFIEDType changed from BOOLEAN to IfcBoolean.
Semantic definitions at the entity
Entity definition

The IfcReparametrisedCompositeCurveSegment is geometrically identical to a IfcCompositeCurveSegment but with the additional capability of reparametrization.

NOTE  Definition according to ISO/CD 10303-42:1992
The reparametrised composite curve segment is a special type of composite curve segment which provides the capability to re-define its parametric length without changing its geometry.

If t~0~ ≤ t ≤ t~1~ is the parameter range of ParentCurve, the new parameter . for the reparametrised composite curve segment is given by the equation:

Image if SameSense = TRUE; or by the equation: Image if SameSense = FALSE;

NOTE  Entity adapted from reparametrised_composite_curve_segment in ISO 10303-42.

HISTORY  New entity in IFC4

Attribute definitions
#AttributeTypeCardinalityDescription G
4ParamLengthIfcParameterValue X
Formal Propositions
RuleDescription
PositiveLengthParameterThe ParamLength shall be greater than zero.
Inherited definitions from supertypes
Entity inheritance IfcCompositeCurveSegment 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
IfcCompositeCurveSegment
1TransitionIfcTransitionCode The state of transition (i.e., geometric continuity from the last point of this segment to the first point of the next segment) in a composite curve. X
2SameSenseIfcBoolean An indicator of whether or not the sense of the segment agrees with, or opposes, that of the parent curve. If SameSense is false, the point with highest parameter value is taken as the first point of the segment.
NOTE  If the datatype of ParentCurve is IfcTrimmedCurve, the value of SameSense overrides the value of IfcTrimmedCurve.SenseAgreement
X
3ParentCurveIfcCurve The bounded curve which defines the geometry of the segment. X
UsingCurvesIfcCompositeCurve
@Segments
S[1:?]The set of composite curves which use this composite curve segment as a segment. This set shall not be empty. X
Dim
:=ParentCurve.Dim
IfcDimensionCountThe space dimensionality of this class, defined by the dimensionality of the first ParentCurve. X
IfcReparametrisedCompositeCurveSegment
4ParamLengthIfcParameterValue X
Formal representations
XML Specification
 <xs:element name="IfcReparametrisedCompositeCurveSegment" type="ifc:IfcReparametrisedCompositeCurveSegment" substitutionGroup="ifc:IfcCompositeCurveSegment" nillable="true"/>
 <xs:complexType name="IfcReparametrisedCompositeCurveSegment">
  <xs:complexContent>
   <xs:extension base="ifc:IfcCompositeCurveSegment">
    <xs:attribute name="ParamLength" type="ifc:IfcParameterValue" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcReparametrisedCompositeCurveSegment
 SUBTYPE OF (IfcCompositeCurveSegment);
  ParamLength : IfcParameterValue;
 WHERE
  PositiveLengthParameter : ParamLength > 0.0;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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