IFC 4.3.x development

8.15.3.14 IfcMirroredProfileDef

Change log

IFC4

added

8.15.3.14.1 Semantic definitions at the entity

The IfcMirroredProfileDef defines the profile by mirroring the parent profile about the y axis of the parent profile coordinate system. That is, left and right of the parent profile are swapped.

Notes:

IfcMirroredProfileDef is primarily useful together with IfcCShapeProfileDef, IfcLShapeProfileDef, IfcUShapeProfileDef, or IfcZShapeProfileDef as parent profile but can be used with other parent profile types as well.

Mirroring of an IfcParameterizedProfileDef is performed after translation and rotation according to its Position attribute. For example, if the parent profile's Position offsets it by half of its width to the right, then the mirrored profile will be offset by half of its width to the left.

Mirroring about the x axis, i.e. swapping top and bottom, can be achieved by mirroring about the y axis coupled with 180 degree rotation about the z axis. In general, rotation happens in a containing object such as IfcSweptAreaSolid, i.e. after mirroring by IfcMirroredProfileDef was performed. If the parent profile is an IfcParameterizedProfileDef, rotation can alternatively happen already in the parent profile by means of its Position attribute, i.e. before mirroring by IfcMirroredProfileDef was performed.

HISTORY  New entity in IFC4.

8.15.3.14.1 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
IfcDerivedProfileDef
3 ParentProfile IfcProfileDef The parent profile provides the origin of the transformation.
4 Operator IfcCartesianTransformationOperator2D Transformation operator applied to the parent profile.
5 Label OPTIONAL IfcLabel The name by which the transformation may be referred to. The actual meaning of the name has to be defined in the context of applications.
IfcMirroredProfileDef
4 Operator INVALID

8.15.3.14.2 Entity inheritance

dot_inheritance IfcMirroredProfileDef IfcMirroredProfileDef IfcDerivedProfileDef IfcDerivedProfileDef IfcMirroredProfileDef->IfcDerivedProfileDef IfcProfileDef IfcProfileDef IfcDerivedProfileDef->IfcProfileDef IfcProfileDef_children 5 more... IfcProfileDef_children->IfcProfileDef

8.15.3.14.3 Definitions applying to General Usage

8.15.3.14.3.1 Property Sets for Objects

PsetName
'Pset_ProfileMechanical'

8.15.3.14.4 Formal representations

ENTITY IfcMirroredProfileDef
 SUBTYPE OF (IfcDerivedProfileDef);
 DERIVE
	SELF\IfcDerivedProfileDef.Operator : IfcCartesianTransformationOperator2D := 
IfcRepresentationItem() || IfcGeometricRepresentationItem() ||
IfcCartesianTransformationOperator(
    -- Axis1
    IfcRepresentationItem() || IfcGeometricRepresentationItem() ||
    IfcDirection([-1., 0.]),
    -- Axis2
    IfcRepresentationItem() || IfcGeometricRepresentationItem() ||
    IfcDirection([ 0., 1.]),
    -- LocalOrigin
    IfcRepresentationItem() || IfcGeometricRepresentationItem() ||
    IfcPoint() || IfcCartesianPoint([0., 0.]),
    -- Scale
    1.) ||
IfcCartesianTransformationOperator2D();
END_ENTITY;