8.9.3.75 IfcVector
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
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- IfcVector
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
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. |
|
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.
The space dimensionality of this class, it is derived from Orientation |
8.9.3.75.4 Formal propositions
Name | Description |
---|---|
MagGreaterOrEqualZero |
The magnitude shall be positive or zero. |
|
8.9.3.75.5 Examples
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;
8.9.3.75.7 References
- IfcBuildAxes
- IfcCrossProduct
- IfcFillAreaStyleTiles
- IfcFirstProjAxis
- IfcGeometricRepresentationItem
- IfcHatchLineDistanceSelect
- IfcLine
- IfcNormalise
- IfcRevolvedAreaSolid
- IfcScalarTimesVector
- IfcSecondProjAxis
- IfcSurfaceOfLinearExtrusion
- IfcSurfaceOfRevolution
- IfcVectorDifference
- IfcVectorOrDirection
- IfcVectorSum