[vtkusers] recommended cell locator for IntersectWithLine tests?

[Dean Inglis]

Hi all,

I am revisiting some old code I wrote to do stereology measurements
(mean intercept length).  I am rotating a set of evenly spaced parallel
test lines (in the x-y plane) and during each rotation I need to find all 
the intersection points
of the lines with a set of perpendicular planes defined by a vtkPolyData
( imagine the planes as being the walls of a maze ).  I was using vtkOBBTree
with the following settings:
    this->OBBTree->CacheCellBoundsOff();
    this->OBBTree->AutomaticOff();
    this->OBBTree->SetMaxLevel( 100 );
    this->OBBTree->SetNumberOfCellsPerNode( 1 );

but there are some cases wherein not all the interesection points are found.
The number of "walls" in the "maze" are in the hundreds but less than a 
thousand.
The walls do not necessarily form closed polygons.  Can anyone recommend
a more robust locator and if so with some suggested settings?

thanks,
Dean