IfcCartesianPoint

BACnet MVD

#### IfcCartesianPoint

Natural language names

| Kartesischer Punkt
| Cartesian Point
| Point cartésien

##### Semantic definitions at the entity

Entity 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.

> NOTE Definition according to ISO/CD 10303-42:1992
> A cartesian_point is a point defined by its coordinates in a rectangular Cartesian coordinate system, or in a parameter space. The entity is defined in a one, two or three-dimensional space as determined by the number of coordinates in the list. Depending upon the geometric representation context in which the point is used the names of the coordinates may be (x,y,z), or (u,v), or any other chosen values.

> NOTE Entity adapted from cartesian_point defined in ISO 10303-42

> HISTORY New entity in IFC1.0

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | Coordinates | IfcLengthMeasure | L[1:3] | 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. | X | X
| Dim :=HIINDEX(Coordinates) | IfcDimensionCount |  | The space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. | X | X

Formal Propositions

Rule | Description
--- | ---
CP2Dor3D | Only two or three dimensional points are in scope.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentationItem

LayerAssignment

IfcPresentationLayerAssignment
@AssignedItems

S[0:1]

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.

> IFC2x3 CHANGE The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.

X

StyledByItem

IfcStyledItem
@Item

S[0:1]

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.

> IFC2x3 CHANGE The inverse attribute StyledByItem has been added.

X

X

IfcGeometricRepresentationItem
IfcPoint
IfcCartesianPoint
1 | Coordinates | IfcLengthMeasure | L[1:3] | 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. | X | X
| Dim :=HIINDEX(Coordinates) | IfcDimensionCount |  | The space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. | X | X

##### Formal representations

XML Specification
`<xs:element name="IfcCartesianPoint" type="ifc:IfcCartesianPoint" substitutionGroup="ifc:IfcPoint" nillable="true"/>
<xs:complexType name="IfcCartesianPoint">
<xs:complexContent>
<xs:extension base="ifc:IfcPoint">
<xs:attribute name="Coordinates" use="optional">
<xs:simpleType>
<xs:restriction>
<xs:simpleType>
<xs:list itemType="ifc:IfcLengthMeasure"/>
</xs:simpleType>
<xs:maxLength value="3"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCartesianPoint
SUBTYPE OF (IfcPoint);
Coordinates : LIST [1:3] OF IfcLengthMeasure;
DERIVE
Dim : IfcDimensionCount := HIINDEX(Coordinates);
WHERE
CP2Dor3D : HIINDEX(Coordinates) >= 2;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcBoundingBox IfcBSplineCurve IfcBSplineSurface IfcCartesianTransformationOperator IfcLine IfcPlacement IfcPolyline IfcTrimmingSelect IfcFillAreaStyleHatching IfcLightSourcePositional IfcPolyLoop

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