IfcOuterBoundaryCurve

IfcOuterBoundaryCurve定义有界曲面的外部边界。

注：定义根据ISO/CD 10303-42:1992

这是边界曲线的一个特殊子类型，它具有定义曲面外部边界的附加语义。曲线边界曲面的边界集中不得包含一条以上的曲线。

注：实体改编自ISO 10303-42中的外边界_曲线。

IFC4中增加的新实体。

 

 

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @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.	X
	StyledByItem	IfcStyledItem @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.	X
IfcGeometricRepresentationItem
IfcCurve
	Dim :=IfcCurveDim(SELF)	IfcDimensionCount	[1:1]	The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.	X
IfcBoundedCurve
IfcCompositeCurve
1	Segments	IfcCompositeCurveSegment	L[1:?]	The component bounded curves, their transitions and senses. The transition attribute for the last segment defines the transition between the end of the last segment and the start of the first; this transition attribute may take the value discontinuous, which indicates an open curve.	X
2	SelfIntersect	IfcLogical	[1:1]	Indication of whether the curve intersects itself or not; this is for information only.	X
	NSegments :=SIZEOF(Segments)	IfcInteger	[1:1]	The number of component curves.	X
	ClosedCurve :=Segments[NSegments].Transition <> Discontinuous	IfcLogical	[1:1]	Indication whether the curve is closed or not; this is derived from the transition code of the last segment.	X
IfcCompositeCurveOnSurface
	BasisSurface :=IfcGetBasisSurface(SELF)	IfcSurface	S[0:1]	The surface on which the composite curve is defined.	X
IfcBoundaryCurve
IfcOuterBoundaryCurve

EXPRESS Specification

ENTITY IfcOuterBoundaryCurve
 SUBTYPE OF (IfcBoundaryCurve);
END_ENTITY;