IFC (IFC4X3_ADD2) under development IfcRoundedRectangleProfileDef Semantic definition

IfcRoundedRectangleProfileDef defines a rectangle with equally rounded corners as the profile definition used by the swept surface geometry or the swept area solid. It is given by the X extent, the Y extent, and the radius for the rounded corners, and placed within the 2D position coordinate system, established by the Position attribute. It is placed centric within the position coordinate system, that is, in the center of the bounding box.

Figure illustrates parameters of the rounded rectangle profile definition.

rounded rectangle profile
Figure — Rounded 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 (e.g. upper-left bound).


The IfcRoundedRectangleProfileDef is defined within the position coordinate system, where the XDim defines the measure for the length of the rectangle (half along the positive x-axis), the YDim defines the length measure for the width of the rectangle (half along the positive y-axis) and the RoundingRadius defines the radius of curvature in all four corners of the rectangle. Entity inheritance Attributes

# Attribute Type Description
IfcProfileDef (4)
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.

HasExternalReference SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects

Reference to external information, e.g. library, classification, or document information, which is associated with the profile.

HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition

Additional properties of the profile, for example mechanical properties.

IfcParameterizedProfileDef (1)
3 Position OPTIONAL IfcAxis2Placement2D

Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.

IfcRectangleProfileDef (2)
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.

Click to show 7 hidden inherited attributes Click to hide 7 inherited attributes
IfcRoundedRectangleProfileDef (1)
6 RoundingRadius IfcPositiveLengthMeasure

Radius of the circular arcs by which all four corners of the rectangle are equally rounded.

Table Formal propositions

Name Description

The value of the attribute RoundingRadius shall be lower or equal than either of both, half the value of the Xdim and the YDim attribute.

((RoundingRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND 
 (RoundingRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)))
Table Property sets

  • Pset_ProfileMechanical
    • MassPerLength
    • CrossSectionArea
    • Perimeter
    • MinimumPlateThickness
    • MaximumPlateThickness
    • CentreOfGravityInX
    • CentreOfGravityInY
    • ShearCentreZ
    • ShearCentreY
    • MomentOfInertiaY
    • MomentOfInertiaZ
    • MomentOfInertiaYZ
    • TorsionalConstantX
    • WarpingConstant
    • ShearDeformationAreaZ
    • ShearDeformationAreaY
    • MaximumSectionModulusY
    • MinimumSectionModulusY
    • MaximumSectionModulusZ
    • MinimumSectionModulusZ
    • TorsionalSectionModulus
    • ShearAreaZ
    • ShearAreaY
    • PlasticShapeFactorY
    • PlasticShapeFactorZ Concept usage

Concept Usage Description
IfcProfileDef (1)
Property Sets for Profiles General

This concept can be applied to the following resources:

Click to show 1 hidden inherited concepts Click to hide 1 inherited concepts
Table Examples Formal representation

ENTITY IfcRoundedRectangleProfileDef
 SUBTYPE OF (IfcRectangleProfileDef);
	RoundingRadius : IfcPositiveLengthMeasure;
	ValidRadius : ((RoundingRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND 
 (RoundingRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)));
END_ENTITY; References

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Is this page difficult to understand? Let us know! Changelog IFC4

  • where rule, ValidRadius
  • where rule, WR31