IFC 4.3.x development

8.9.3.40 IfcOffsetCurve

Change log

IFC4X1

added

8.9.3.40.1 Semantic definitions at the entity

An IfcOffsetCurve is an abstract entity describing a curve that is defined relative to another curve according to an offset that may be constant or variable along the referenced curve.

8.9.3.40.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment 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.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item 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.
IfcGeometricRepresentationItem
IfcCurve
Dim INVALID The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.
IfcOffsetCurve
1 BasisCurve IfcCurve The curve that is being offset.

8.9.3.40.2 Entity inheritance

dot_inheritance IfcOffsetCurve2D IfcOffsetCurve2D IfcOffsetCurve IfcOffsetCurve IfcOffsetCurve2D->IfcOffsetCurve IfcCurve IfcCurve IfcOffsetCurve->IfcCurve IfcOffsetCurve3D IfcOffsetCurve3D IfcOffsetCurve3D->IfcOffsetCurve IfcOffsetCurveByDistances IfcOffsetCurveByDistances IfcOffsetCurveByDistances->IfcOffsetCurve IfcCurve_children 7 more... IfcCurve_children->IfcCurve IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcCurve->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.9.3.40.3 Formal representations

ENTITY IfcOffsetCurve
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcOffsetCurve2D
	,IfcOffsetCurve3D
	,IfcOffsetCurveByDistances))
 SUBTYPE OF (IfcCurve);
	BasisCurve : IfcCurve;
END_ENTITY;