[vtkusers] Extracting a 2D curve from a 3D surface and 2 vertices

[Matthew D. DiFranco]

I have a 3D surface and would like to extract a 2D curve which 
intersects the plane created by two vertices on the surface. Does 
anyone have a suggestion for going about this?

Matt DiFranco
m.difranco at eastman.ucl.ac.uk