IFC 4.3.x development IfcRectangleProfileDef Semantic definitions at the entity

IfcRectangleProfileDef defines a rectangle as the profile definition used by the swept surface geometry or the swept area solid. It is given by its X extent and its Y extent, and placed within the 2D position coordinate system, established by the Position attribute. It is placed centric within the position coordinate system.

HISTORY  New entity in IFC1.5.

Figure 1 illustrates parameters of the rectangle profile definition.

rectangle profile

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 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 IfcRectangleProfileDef is defined within the position coordinate system, where the XDim defines the length measure for the length of the rectangle (half along the positive x-axis) and the YDim defines the length measure for the width of the rectangle (half along the positive y-axis).

Figure 1 — Rectangle profile Attributes

# Attribute Type Description
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

3 Position OPTIONAL IfcAxis2Placement2D Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.
4 XDim IfcPositiveLengthMeasure The extent of the rectangle in the direction of the x-axis.
5 YDim IfcPositiveLengthMeasure The extent of the rectangle in the direction of the y-axis. Entity inheritance

dot_inheritance IfcRectangleHollowProfileDef IfcRectangleHollowProfileDef IfcRectangleProfileDef IfcRectangleProfileDef IfcRectangleHollowProfileDef->IfcRectangleProfileDef IfcParameterizedProfileDef IfcParameterizedProfileDef IfcRectangleProfileDef->IfcParameterizedProfileDef IfcRoundedRectangleProfileDef IfcRoundedRectangleProfileDef IfcRoundedRectangleProfileDef->IfcRectangleProfileDef IfcParameterizedProfileDef_children 10 more... IfcParameterizedProfileDef_children->IfcParameterizedProfileDef IfcProfileDef IfcProfileDef IfcParameterizedProfileDef->IfcProfileDef IfcProfileDef_children 5 more... IfcProfileDef_children->IfcProfileDef Definitions applying to General Usage Property Sets for Objects

'Pset_ProfileMechanical' Formal representations

ENTITY IfcRectangleProfileDef
 SUBTYPE OF (IfcParameterizedProfileDef);
	XDim : IfcPositiveLengthMeasure;
	YDim : IfcPositiveLengthMeasure;