IFC 4.3.x development

8.8.3.10 IfcCartesianPointList3D

Change log

IFC4

added

IFC4X1

additionsattributesTagList

8.8.3.10.1 Semantic definitions at the entity

The IfcCartesianPointList3D defines an ordered collection of three-dimentional Cartesian points. Each Cartesian point is provided as an three-dimensional point by a fixed list of three coordinates. The attribute CoordList is a two-dimensional list, where

  • first dimension is an unbounded list representing each 3D Cartesian point;
  • second dimension is a fixed list of three list members, where [1] is the x-coordinate, [2] the y-coordinate and [3] the z-coordinate of the Cartesian point.

NOTE  The IfcCartesianPointList is introduced to provide a compact representation of larger list of points, such as in point clouds, and in indexable representation of points used as vertices in tessellated items or poly curves.

HISTORY  New entity in IFC4.

8.8.3.10.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment 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.
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.



> IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
IfcGeometricRepresentationItem
IfcCartesianPointList
Dim INVALID The space dimensionality of this class, either 2 or 3, depending on the sub type.
IfcCartesianPointList3D
1 CoordList LIST [1:?] OF LIST [3:3] OF IfcLengthMeasure Two-dimensional list of Cartesian points provided by three coordinates.
2 TagList OPTIONAL LIST [1:?] OF IfcLabel List of tags corresponding to each point that may be used to identify a basis curve according to the Tag attribute at IfcOffsetCurveByDistances or IfcAlignmentCurve.

8.8.3.10.2 Entity inheritance

dot_inheritance IfcCartesianPointList3D IfcCartesianPointList3D IfcCartesianPointList IfcCartesianPointList IfcCartesianPointList3D->IfcCartesianPointList IfcCartesianPointList2D IfcCartesianPointList2D IfcCartesianPointList2D->IfcCartesianPointList IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcCartesianPointList->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.8.3.10.3 Formal representations

ENTITY IfcCartesianPointList3D
 SUBTYPE OF (IfcCartesianPointList);
	CoordList : LIST [1:?] OF LIST [3:3] OF IfcLengthMeasure;
	TagList : OPTIONAL LIST [1:?] OF IfcLabel;
END_ENTITY;