8.9.3.75 IfcVector

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AbV ⓘ

8.9.3.75.1 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.

{ .extDef}

8.9.3.75.2 Entity inheritance

8.9.3.75.3 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. IFC2x3-CHANGE The inverse attribute LayerAssignments has been added. IFC4-CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
	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. IFC2x3-CHANGE The inverse attribute StyledByItem has been added.
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 A

8.9.3.75.4 Formal propositions

Name	Description
MagGreaterOrEqualZero	The magnitude shall be positive or zero.
`Magnitude >= 0.0`

Table B

8.9.3.75.5 Formal representation

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