Natural language names
Kreisprofil - parametrische Definition
Circle Profile Def
Définition de profil circulaire
Change log
      PositionMODIFIEDInstantiation changed to OPTIONAL.
Semantic definitions at the entity
Entity definition

IfcCircleProfileDef defines a circle as the profile definition used by the swept surface geometry or by the swept area solid. It is given by its Radius attribute and placed within the 2D position coordinate system, established by the Position attribute.

HISTORY  New entity in IFC1.5.

Figure 434 illustrates parameters for the circle 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:

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 (e.g. upper-left bound). The Position attribute defines the 2D position coordinate system of the circle.
The Radius attribute defines the radius of the circle.

circle profile

Figure 434 — Circle profile

Attribute definitions
#AttributeTypeCardinalityDescription G
4RadiusIfcPositiveLengthMeasure The radius of the circle.X
Inherited definitions from supertypes
Entity inheritance IfcCircleHollowProfileDef IfcParameterizedProfileDef IfcProfileDef
Attribute inheritance
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
S[0:?]Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
IFC4 CHANGE New inverse attribute
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
3PositionIfcAxis2Placement2D? Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied. X
4RadiusIfcPositiveLengthMeasure The radius of the circle.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcCircleProfileDef" type="ifc:IfcCircleProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>
 <xs:complexType name="IfcCircleProfileDef">
   <xs:extension base="ifc:IfcParameterizedProfileDef">
    <xs:attribute name="Radius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
EXPRESS Specification
ENTITY IfcCircleProfileDef
 SUPERTYPE OF(IfcCircleHollowProfileDef)
 SUBTYPE OF (IfcParameterizedProfileDef);
  Radius : IfcPositiveLengthMeasure;

Link to EXPRESS-G diagram EXPRESS-G diagram

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