﻿ IfcEllipseProfileDef

#### IfcEllipseProfileDef

Natural language names
 ellipsoides Profil - parametrische Definition Ellipse Profile Def Définition de profil ellipsoïdal
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
IfcEllipseProfileDef
PositionMODIFIEDInstantiation changed to OPTIONAL.
##### Semantic definitions at the entity
Entity definition

IfcEllipseProfileDef defines an ellipse as the profile definition used by the swept surface geometry or the swept area solid. It is given by its semi axis attributes and placed within the 2D position coordinate system, established by the Position attribute.

HISTORY  New entity in IFC2x

Figure 421 illustrates parameters for the ellipse profile definition. The parameterized profile defines its own position coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

• IfcSweptSurface.Position
• IfcSweptAreaSolid.Position

Or in case of sectioned spines it is the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. By using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile. Explicit coordinate offsets are used to define cardinal points (for example, upper-left bound). The location of the position coordinate system defines the center of the ellipse. The SemiAxis1 attribute defines the first radius of the ellipse in the direction of the X axis, the SemiAxis2 attribute defines the second radius of the ellipse in the direction of the Y axis.

NOTE  The semi axes of the ellipse are rectangular to each other by definition.
 Figure 421 — Ellipse profile
Attribute definitions
#AttributeTypeCardinalityDescription G
4SemiAxis1IfcPositiveLengthMeasure The first radius of the ellipse. It is measured along the direction of Position.P[1].X
5SemiAxis2IfcPositiveLengthMeasure The second radius of the ellipse. It is measured along the direction of Position.P[2].X
##### Inherited definitions from supertypes
Entity inheritance
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcProfileDef
1ProfileTypeIfcProfileTypeEnum Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid.X
2ProfileNameIfcLabel? Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference. X
HasExternalReferenceIfcExternalReferenceRelationship
@RelatedResourceObjects
S[0:?]Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
IFC4 CHANGE New inverse attribute
X
HasPropertiesIfcProfileProperties
@ProfileDefinition
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
X
IfcParameterizedProfileDef
3PositionIfcAxis2Placement2D? Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied. X
IfcEllipseProfileDef
4SemiAxis1IfcPositiveLengthMeasure The first radius of the ellipse. It is measured along the direction of Position.P[1].X
5SemiAxis2IfcPositiveLengthMeasure The second radius of the ellipse. It is measured along the direction of Position.P[2].X
##### Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcProfileDef
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage

##### Formal representations
XML Specification
``` <xs:element name="IfcEllipseProfileDef" type="ifc:IfcEllipseProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>  <xs:complexType name="IfcEllipseProfileDef">   <xs:complexContent>    <xs:extension base="ifc:IfcParameterizedProfileDef">     <xs:attribute name="SemiAxis1" type="ifc:IfcPositiveLengthMeasure" use="optional"/>     <xs:attribute name="SemiAxis2" type="ifc:IfcPositiveLengthMeasure" use="optional"/>    </xs:extension>   </xs:complexContent>  </xs:complexType> ```
EXPRESS Specification
``` ENTITY IfcEllipseProfileDef  SUBTYPE OF (IfcParameterizedProfileDef);   SemiAxis1 : IfcPositiveLengthMeasure;   SemiAxis2 : IfcPositiveLengthMeasure; END_ENTITY;  EXPRESS-G diagram ```