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
#AttributeTypeCardinalityDescription G
1CoordinatesIfcLengthMeasureL[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
Dim
:=HIINDEX(Coordinates)
IfcDimensionCountThe space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. X
Formal Propositions
RuleDescription
CP2Dor3DOnly two or three dimensional points are in scope.
Inherited definitions from supertypes
Entity inheritance IfcPoint IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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
StyledByItemIfcStyledItem
@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
IfcGeometricRepresentationItem
IfcPoint
IfcCartesianPoint
1CoordinatesIfcLengthMeasureL[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
Dim
:=HIINDEX(Coordinates)
IfcDimensionCountThe space dimensionality of this class, determined by the number of coordinates in the List of Coordinates. 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcBoundingBox IfcBSplineCurve IfcBSplineSurface IfcCartesianTransformationOperator IfcCurveSegment2D IfcLine IfcPlacement IfcPolyline IfcTrimmingSelect IfcFillAreaStyleHatching IfcLightSourcePositional IfcPolyLoop

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