IfcArbitraryOpenProfileDef

Definition from IAI: The open profile IfcArbitraryOpenProfileDef defines an arbitrary two-dimensional open profile for the use within the swept surface geometry. It is given by an open boundary from with the surface can be constructed.

HISTORY: New entity in IFC Release 2x.

Informal proposition:

The Curve has to be an open curve.

Illustration:

Position
The Curve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface that uses the profile definition. It is the xy plane of:

IfcSweptSurface.Position

Parameter
The Curve attribute defines a two dimensional open bounded curve.

Table: Definition of arbitrary open profile definition

EXPRESS specification:

ENTITY IfcArbitraryOpenProfileDef

SUPERTYPE OF

(IfcCenterLineProfileDef)

SUBTYPE OF (

IfcProfileDef);

Curve

IfcBoundedCurve;

WHERE

WR11	:	('IFCPROFILERESOURCE.IFCCENTERLINEPROFILEDEF' IN TYPEOF(SELF)) OR (SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
WR12	:	Curve.Dim = 2;

END_ENTITY;

Attribute definitions:

Curve

Open bounded curve defining the profile.

Formal Propositions:

WR11	:	The profile type is a CURVE, an open profile can only be used to define a swept surface.
WR12	:	The dimensionality of the curve shall be 2.

Inheritance graph

ENTITY IfcArbitraryOpenProfileDef;

ENTITY IfcProfileDef;

ProfileType

IfcProfileTypeEnum;

ProfileName

OPTIONAL IfcLabel;

ENTITY IfcArbitraryOpenProfileDef;

Curve

IfcBoundedCurve;

END_ENTITY;