[vtkusers] is there a line intersection test in 2D

[sebastien MARAUX]

Hello,

I would like to use intersectWithLine method of cells,
but it works in 3D, and I want to use 2D intersection test
between 2 lines (and obtaining yes or not + intersection 
point)

IntersectWithLine on an edge or triangle for example can 
test if plane intersect with 3D line, but I do not know if it can 
test if a coplanar 2D line intersect with the cell, it does not seem to be the case. 

However, I need such an algorithm, should I implement it 
myself. Does someone have a c++ example at hand ?
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