IFC 4.3.0.1 (IFC4X3) development

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

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.

NVL(Scale, 1.0)

The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise.

* Dim IfcDimensionCount

This attribute is formally derived.

LocalOrigin.Dim

The space dimensionality of this class, determined by the space dimensionality of the local origin.

Table 8.9.3.13.A

8.9.3.13.4 Formal propositions

Name Description
ScaleGreaterZero

The derived scaling Scl shall be greater than zero.

Scl > 0.0
Table 8.9.3.13.B

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;

8.9.3.13.6 References

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8.9.3.13.7 Changelog

  • where rule, ScaleGreaterZero
  • where rule, WR1
  • attribute Scale type, Changed from "real" to "IfcReal"