8.9.3.75 IfcVector

AbRV ⓘ

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.

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 8.9.3.75.F

8.9.3.75.4 Formal propositions

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

Table 8.9.3.75.G

8.9.3.75.5 Examples

Figure 8.9.3.75.A

Fixed Reference Swept Area Solid
Figure 8.9.3.75.B

Curve Parameters In Degrees
Figure 8.9.3.75.C

Curve Parameters In Radians
Figure 8.9.3.75.D

Sectioned Solid Horizontal
Figure 8.9.3.75.E

Linear Placement Of Signal

8.9.3.75.6 Formal representation

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