18.104.22.168.1 Semantic definition
An IfcOffsetCurve3D is a curve defined by an offset in 3D space from its BasisCurve.
- At no point on the curve shall ref direction be parallel, or opposite to, the direction of the tangent vector.
22.214.171.124.2 Entity inheritance
|LayerAssignment||SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems||
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.
|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.
This attribute is formally derived.
The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.
The curve that is being offset.
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The distance of the offset curve from the basis curve. The distance may be positive, negative or zero.
An indication of whether the offset curve self-intersects, this is for information only.
The direction used to define the direction of the offset curve 3d from the basis curve.
126.96.36.199.4 Formal propositions
The underlying curve shall be defined in three-dimensional space.
188.8.131.52.5 Formal representation
ENTITY IfcOffsetCurve3D SUBTYPE OF (IfcOffsetCurve); Distance : IfcLengthMeasure; SelfIntersect : IfcLogical; RefDirection : IfcDirection; WHERE DimIs2D : BasisCurve.Dim = 3; END_ENTITY;