IFC (IFC4X3_TC1) IfcPolyline Semantic definition

The IfcPolyline is a bounded curve with only linear segments defined by a list of Cartesian points. If the first and the last Cartesian point in the list are identical, then the polyline is a closed curve, otherwise it is an open curve.

polyline examples
Figure — Bounded _IfcPolyline_ with parametric length
Image for 1 ≤ in - 1 where i - 1 ≤ ui and with parametric range of 0 <≤ un - 1.
Figure Entity inheritance 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.

IfcCurve (1)
* Dim IfcDimensionCount

This attribute is formally derived.


The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.

Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcPolyline (1)
1 Points LIST [2:?] OF IfcCartesianPoint

The points defining the polyline.

Table Formal propositions

Name Description

The space dimensionality of all Points shall be the same.

SIZEOF(QUERY(Temp <* Points | Temp.Dim <> Points[1].Dim)) = 0
Table Examples Formal representation

ENTITY IfcPolyline
 SUBTYPE OF (IfcBoundedCurve);
	Points : LIST [2:?] OF IfcCartesianPoint;
	SameDim : SIZEOF(QUERY(Temp <* Points | Temp.Dim <> Points[1].Dim)) = 0;
END_ENTITY; References Changelog IFC4

  • where rule, SameDim
  • where rule, WR41