# 8.9.3.38 IfcLine

## 8.9.3.38.1 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.

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

## 8.9.3.38.6 Formal representation

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