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8.9.3.37 IfcLine

AbV ⓘ

8.9.3.37.1 Semantic definition

The IfcLine is an unbounded line parameterized by an IfcCartesianPoint and an IfcVector. The magnitude of the IfcVector affects the parameterization of the line, but it does not bound the line.

line examples
Figure 8.9.3.37.A — Unbounded _IfcLine_ and bounded _IfcTrimmedCurve_

P = Pnt V = Dir λ(u) = P + uV and the parametric range is: -∞ < u < ∞

8.9.3.37.2 Entity inheritance

8.9.3.37.3 Attributes

# Attribute Type Description
IfcRepresentationItem (2)
IfcCurve (1)
Click to show 3 hidden inherited attributes
IfcLine (2)
1 Pnt IfcCartesianPoint

The location of the IfcLine.

2 Dir IfcVector

The direction of the IfcLine, the magnitude and units of Dir affect the parameterization of the line.

Table 8.9.3.37.G

8.9.3.37.4 Formal propositions

Name Description
SameDim

The dimensionality of the Pnt, provided by IfcCartesianPoint, shall be the same as the dimensionality of the Dir, provided by IfcVector.

Dir.Dim = Pnt.Dim
Table 8.9.3.37.H

8.9.3.37.5 Examples

8.9.3.37.6 Formal representation

ENTITY IfcLine
SUBTYPE OF (IfcCurve);
Pnt : IfcCartesianPoint;
Dir : IfcVector;
WHERE
SameDim : Dir.Dim = Pnt.Dim;
END_ENTITY;

8.9.3.37.7 References

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8.9.3.37.8 Changelog

8.9.3.37.8.1 IFC4

  • where rule, SameDim
  • where rule, WR1