IFC 4.3.x development

8.15.3.1 IfcArbitraryClosedProfileDef

Change log

IFC4

additionswhere_rulesWR2
additionswhere_rulesWR3
deletionswhere_rulesWR2
deletionswhere_rulesWR3

IFC4X1

additionswhere_rulesWR2
additionswhere_rulesWR3
deletionswhere_rulesWR2
deletionswhere_rulesWR3

IFC4X2

additionswhere_rulesWR2
additionswhere_rulesWR3
deletionswhere_rulesWR2
deletionswhere_rulesWR3

IFC4X3_RC3

additionswhere_rulesWR2
additionswhere_rulesWR3
deletionswhere_rulesWR2
deletionswhere_rulesWR3

8.15.3.1.1 Semantic definitions at the entity

The closed profile IfcArbitraryClosedProfileDef defines an arbitrary two-dimensional profile for the use within the swept surface geometry, the swept area solid or a sectioned spine. It is given by an outer boundary from which the surface or solid can be constructed.

HISTORY  New entity in IFC1.5. Entity has been renamed from IfcArbitraryProfileDef in IFC2x.

Informal Propositions:

  1. The OuterCurve has to be a closed curve.
  2. The OuterCurve shall not intersect.

Figure 1 illustrates the arbitrary closed profile definition. The OuterCurve is defined in the underlying 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 the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. The OuterCurve attribute defines a two dimensional closed bounded curve.

"arbitrary profile without boundaries"

8.15.3.1.1 Attributes

# Attribute Type Description
IfcProfileDef
1 ProfileType IfcProfileTypeEnum 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.
2 ProfileName OPTIONAL IfcLabel 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_.
HasExternalReferenceSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjectsReference to external information, e.g. library, classification, or document information, which is associated with the profile.

> IFC4 CHANGE New inverse attribute
HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition Additional properties of the profile, for example mechanical properties.

> IFC4 CHANGE New inverse attribute
IfcArbitraryClosedProfileDef
3 OuterCurve IfcCurve Bounded curve, defining the outer boundaries of the arbitrary profile.

8.15.3.1.2 Entity inheritance

dot_inheritance IfcArbitraryProfileDefWithVoids IfcArbitraryProfileDefWithVoids IfcArbitraryClosedProfileDef IfcArbitraryClosedProfileDef IfcArbitraryProfileDefWithVoids->IfcArbitraryClosedProfileDef IfcProfileDef IfcProfileDef IfcArbitraryClosedProfileDef->IfcProfileDef IfcProfileDef_children 5 more... IfcProfileDef_children->IfcProfileDef

8.15.3.1.3 Definitions applying to General Usage

8.15.3.1.3.1 Property Sets for Objects

PsetName
'Pset_ProfileMechanical'

8.15.3.1.4 Formal representations

ENTITY IfcArbitraryClosedProfileDef
 SUPERTYPE OF (ONEOF
	(IfcArbitraryProfileDefWithVoids))
 SUBTYPE OF (IfcProfileDef);
	OuterCurve : IfcCurve;
 WHERE
	WR1 : OuterCurve.Dim = 2;
	WR2 : NOT('IFC4X3_DEV_a1492713.IFCLINE' IN TYPEOF(OuterCurve));
	WR3 : NOT('IFC4X3_DEV_a1492713.IFCOFFSETCURVE2D' IN TYPEOF(OuterCurve));
END_ENTITY;