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[nsoonhui <>]

For 2D Arrangement, one is able to do 
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2/Chapter_main.html#Subsection_30.3.2
vertical ray-shooting query . But unfortunately, for a lot of application,
doing vertical ray shooting is a bit too limiting; is there anyway I can do
arbitrary direction ray shooting ( i.e, I can shoot the ray in any direction
given any query point, and find whether the ray intersects a vertex, an edge
or a face, not just vertically)?
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