IFC 4.3.0.1 (IFC4X3_TC1)

8.9.3.76 IfcVector

8.9.3.76.1 Semantic definition

An IfcVector is a geometric representation item having both a magnitude and direction. The magnitude of the vector is solely defined by the Magnitude attribute and the direction is solely defined by the Orientation attribute.

8.9.3.76.2 Entity inheritance

8.9.3.76.3 Attributes

# Attribute Type Description
IfcRepresentationItem (2)
LayerAssignment SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems

Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

StyledByItem SET [0:1] OF IfcStyledItem FOR Item

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.

Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcVector (3)
1 Orientation IfcDirection

The direction of the vector.

2 Magnitude IfcLengthMeasure

The magnitude of the vector. All vectors of Magnitude 0.0 are regarded as equal in value regardless of the orientation attribute.

* Dim IfcDimensionCount

This attribute is formally derived.

Orientation.Dim

The space dimensionality of this class, it is derived from Orientation

Table 8.9.3.76.B

8.9.3.76.4 Formal propositions

Name Description
MagGreaterOrEqualZero

The magnitude shall be positive or zero.

Magnitude >= 0.0
Table 8.9.3.76.C

8.9.3.76.5 Examples

8.9.3.76.6 Formal representation

ENTITY IfcVector
 SUBTYPE OF (IfcGeometricRepresentationItem);
	Orientation : IfcDirection;
	Magnitude : IfcLengthMeasure;
 DERIVE
	 Dim : IfcDimensionCount := Orientation.Dim;
 WHERE
	MagGreaterOrEqualZero : Magnitude >= 0.0;
END_ENTITY;

8.9.3.76.7 References

8.9.3.76.8 Changelog

8.9.3.76.8.1 IFC4

  • where rule, MagGreaterOrEqualZero
  • where rule, WR1