IfcConic是參數化的平面曲線。

注：定義根據ISO/CD 10303-42:1992

圓錐曲線是一個平面曲線，它可以由一個平面與一個圓錐相交而成。圓錐曲線是根據其固有的幾何性質來定義的，而不是用其他幾何來描述的。圓錐實體始終有一個由axis2_placement定義的放置坐標系；參數表示是根據該放置坐標系定義的。

注：實體改編自ISO 10303-42中定義的圓錐曲線

IFC1.0中增加的新實體

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). TheLayerAssignmentscan override aLayerAssignmentsof theIfcRepresentationit is used within the list ofItems.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to theIfcStyledItemthat 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
IfcConic
1	Position	IfcAxis2Placement	[1:1]	The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes."	X

EXPRESS Specification

ENTITY IfcConic
 ABSTRACT SUPERTYPE OF(ONEOF(IfcCircle, IfcEllipse))
 SUBTYPE OF (IfcCurve);
  Position : IfcAxis2Placement;
END_ENTITY;

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