8.9.3.30 IfcDirection
8.9.3.30.1 Semantic definition
The IfcDirection provides a direction in two or three dimensional space depending on the number of DirectionRatio's provided. The IfcDirection does not imply a vector length, and the direction ratios does not have to be normalized.
8.9.3.30.2 Entity inheritance
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- IfcDirection
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.30.3 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 | |||
IfcDirection (2) | |||
1 | DirectionRatios | LIST [2:3] OF IfcReal |
The components in the direction of X axis (DirectionRatios[1]), of Y axis (DirectionRatios[2]), and of Z axis (DirectionRatios[3]) |
* | Dim | IfcDimensionCount |
This attribute is formally derived.
The space dimensionality of this class, defined by the number of real in the list of DirectionRatios. |
8.9.3.30.4 Formal propositions
Name | Description |
---|---|
MagnitudeGreaterZero |
The magnitude of the direction vector shall be greater than zero. |
|
8.9.3.30.5 Formal representation
ENTITY IfcDirection
SUBTYPE OF (IfcGeometricRepresentationItem);
DirectionRatios : LIST [2:3] OF IfcReal;
DERIVE
Dim : IfcDimensionCount := HIINDEX(DirectionRatios);
WHERE
MagnitudeGreaterZero : SIZEOF(QUERY(Tmp <* DirectionRatios | Tmp <> 0.0)) > 0;
END_ENTITY;
8.9.3.30.6 References
- IfcAxis1Placement
- IfcAxis2Placement2D
- IfcAxis2Placement3D
- IfcAxis2PlacementLinear
- IfcBaseAxis
- IfcBuild2Axes
- IfcBuildAxes
- IfcCartesianTransformationOperator
- IfcCartesianTransformationOperator2D
- IfcCartesianTransformationOperator3D
- IfcConvertDirectionInto2D
- IfcCrossProduct
- IfcDotProduct
- IfcExtrudedAreaSolid
- IfcFirstProjAxis
- IfcFixedReferenceSweptAreaSolid
- IfcGeometricRepresentationContext
- IfcGeometricRepresentationItem
- IfcGeometricRepresentationSubContext
- IfcGridPlacementDirectionSelect
- IfcLightSourceDirectional
- IfcLightSourceSpot
- IfcMirroredProfileDef
- IfcNormalise
- IfcOffsetCurve3D
- IfcOrthogonalComplement
- IfcSameDirection
- IfcScalarTimesVector
- IfcSecondProjAxis
- IfcStructuralCurveConnection
- IfcStructuralCurveMember
- IfcSurfaceOfLinearExtrusion
- IfcVector
- IfcVectorDifference
- IfcVectorOrDirection
- IfcVectorSum