8.9.3.13 IfcCartesianTransformationOperator
ABSTRACT This definition may not be instantiated
8.9.3.13.1 Semantic definition
An IfcCartesianTransformationOperator defines an abstract supertype of different kinds of geometric transformations.
8.9.3.13.2 Entity inheritance
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- IfcCartesianTransformationOperator
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.13.3 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 | |||
| IfcCartesianTransformationOperator (6) | |||
| 1 | Axis1 | OPTIONAL IfcDirection |
The direction used to determine U[1], the derived X axis direction. |
| 2 | Axis2 | OPTIONAL IfcDirection |
The direction used to determine U[2], the derived Y axis direction. |
| 3 | LocalOrigin | IfcCartesianPoint |
The required translation, specified as a cartesian point. The actual translation included in the transformation is from the geometric origin to the local origin. |
| 4 | Scale | OPTIONAL IfcReal |
The scaling value specified for the transformation. |
| * | Scl | IfcReal |
This attribute is formally derived. The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise. |
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, determined by the space dimensionality of the local origin. |
8.9.3.13.4 Formal propositions
| Name | Description |
|---|---|
| ScaleGreaterZero |
The derived scaling Scl shall be greater than zero. |
|
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8.9.3.13.5 Formal representation
ENTITY IfcCartesianTransformationOperator
ABSTRACT SUPERTYPE OF (ONEOF
(IfcCartesianTransformationOperator2D
,IfcCartesianTransformationOperator3D))
SUBTYPE OF (IfcGeometricRepresentationItem);
Axis1 : OPTIONAL IfcDirection;
Axis2 : OPTIONAL IfcDirection;
LocalOrigin : IfcCartesianPoint;
Scale : OPTIONAL IfcReal;
DERIVE
Scl : IfcReal := NVL(Scale, 1.0);
Dim : IfcDimensionCount := LocalOrigin.Dim;
WHERE
ScaleGreaterZero : Scl > 0.0;
END_ENTITY;