IFC 4.3.0.1 (IFC4X3) development

8.9.3.12 IfcCartesianPoint

8.9.3.12.1 Semantic definition

An IfcCartesianPoint defines a point by coordinates in an orthogonal, right-handed Cartesian coordinate system. For the purpose of this specification only two and three dimensional Cartesian points are used.

8.9.3.12.2 Entity inheritance

8.9.3.12.3 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
IfcCartesianPoint (2)
1 Coordinates LIST [1:3] OF IfcLengthMeasure

The first, second, and third coordinate of the point location. If placed in a two or three dimensional rectangular Cartesian coordinate system, Coordinates[1] is the X coordinate, Coordinates[2] is the Y coordinate, and Coordinates[3] is the Z coordinate.

* Dim IfcDimensionCount

This attribute is formally derived.

HIINDEX(Coordinates)

The space dimensionality of this class, determined by the number of coordinates in the List of Coordinates.

Table 8.9.3.12.U

8.9.3.12.4 Formal propositions

Name Description
CP2Dor3D

Only two or three dimensional points are in scope.

HIINDEX(Coordinates) >= 2
Table 8.9.3.12.V

8.9.3.12.5 Examples

8.9.3.12.6 Formal representation

ENTITY IfcCartesianPoint
 SUBTYPE OF (IfcPoint);
	Coordinates : LIST [1:3] OF IfcLengthMeasure;
 DERIVE
	 Dim : IfcDimensionCount := HIINDEX(Coordinates);
 WHERE
	CP2Dor3D : HIINDEX(Coordinates) >= 2;
END_ENTITY;

8.9.3.12.7 References

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8.9.3.12.8 Changelog

  • where rule, CP2Dor3D
  • where rule, WR1