|modifications||attributes EdgeRadius definition||Changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure|
|modifications||attributes FilletRadius definition||Changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure|
IfcLShapeProfileDef defines a section profile that provides the defining parameters of an L-shaped section (equilateral L profiles are also covered by this entity) to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. The shorter leg has the same direction as the positive Position.P-axis, the longer or equal leg the same as the positive Position.P-axis. The centre of the position coordinate system is in the profiles centre of the bounding box.
HISTORY New entity in IFC2x2.
IFC2x3 CHANGE All profile origins are now in the center of the bounding box.
IFC4 CHANGE Types of FilletRadius and EdgeRadius were relaxed to allow for zero values.
Trailing attributes CentreOfGravityInX and CentreOfGravityInY deleted, use respective properties in IfcExtendedProfileProperties instead.
WHERE rule which required Width <= Depth removed.
Figure 1 illustrates parameters of equal-sided and non-equal sided L-shaped section definitions.
Figure 1 — L-shape profile
|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.|
> 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||Depth||IfcPositiveLengthMeasure||Leg length, see illustration above (= h). Same as the overall depth.|
|5||Width||OPTIONAL IfcPositiveLengthMeasure||Leg length, see illustration above (= b). Same as the overall width. This attribute is formally optional for historic reasons only. Whenever the width is known, it shall be provided by value.|
|6||Thickness||IfcPositiveLengthMeasure||Constant wall thickness of profile, see illustration above (= ts).|
|7||FilletRadius||OPTIONAL IfcNonNegativeLengthMeasure||Fillet radius according the above illustration (= r1).|
|8||EdgeRadius||OPTIONAL IfcNonNegativeLengthMeasure||Edge radius according the above illustration (= r2).|
|9||LegSlope||OPTIONAL IfcPlaneAngleMeasure||Slope of the inner face of each leg of the profile.|
ENTITY IfcLShapeProfileDef SUBTYPE OF (IfcParameterizedProfileDef); Depth : IfcPositiveLengthMeasure; Width : OPTIONAL IfcPositiveLengthMeasure; Thickness : IfcPositiveLengthMeasure; FilletRadius : OPTIONAL IfcNonNegativeLengthMeasure; EdgeRadius : OPTIONAL IfcNonNegativeLengthMeasure; LegSlope : OPTIONAL IfcPlaneAngleMeasure; WHERE ValidThickness : (Thickness < Depth) AND (NOT(EXISTS(Width)) OR (Thickness < Width)); END_ENTITY;