IfcConic

Semantic definitions at the entity

Entity definition

An IfcConic is a parameterized planar curve.

NOTE Definition according to ISO/CD 10303-42:1992
A conic is a planar curve which could be produced by intersecting a plane with a cone. A conic is defined in terms of its intrinsic geometric properties rather than being described in terms of other geometry. A conic entity always has a placement coordinate system defined by axis2_placement; the parametric representation is defined in terms of this placement coordinate system.

NOTE Entity adapted from conic defined in ISO 10303-42

HISTORY New entity in IFC1.0

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	Position	IfcAxis2Placement		The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes."	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
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. 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
	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. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcCurve
	Dim :=IfcCurveDim(SELF)	IfcDimensionCount		The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.	X
IfcConic
1	Position	IfcAxis2Placement		The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes."	X

Formal representations

XML Specification

 <xs:element name="IfcConic" type="ifc:IfcConic" abstract="true" substitutionGroup="ifc:IfcCurve" nillable="true"/>

 <xs:complexType name="IfcConic" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:IfcCurve">

    <xs:sequence>

     <xs:element name="Position">

      <xs:complexType>

       <xs:group ref="ifc:IfcAxis2Placement"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcConic

 ABSTRACT SUPERTYPE OF(ONEOF(IfcCircle, IfcEllipse))

 SUBTYPE OF (IfcCurve);

  Position : IfcAxis2Placement;

END_ENTITY;

 EXPRESS-G diagram

	Konische Form
	Conic
	Conique