[vtkusers] Find intersection point between a line and an actor

[Clare Fitzpatrick]

Hi,

I have a vtk actor (from polydata), which is intersected by a line. I want to find the coordinates at the point of intersection (the actual point on the surface, rather than the closest vertex). I was looking at the IntersectWithLine method for vtkCellLocator, but I'm using Tcl, and I can't figure out how to implement it in Tcl. (Although I figure this gives me the cell Id rather than the point coordinate, but I can calculate the intersection point from there).

Can anyone help with either implementing this in Tcl, or any other suggestions for finding the intersection point?
Thanks
Clare 
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