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["Sebastien Loriot (GeometryFactory)" <>]

nsoonhui wrote:
> Hello, I look through my CGAL installation directory, and I don't 
> find"Arr_landmarks_pl_impl.h" file.
Are you using CGAL-3.7?

this include file is located here:

CGAL-3.7/include/CGAL/Arr_point_location/Arr_landmarks_pl_impl.h

> May I know where it is located? And whether is it an example file, or 
> core source file?
>
> On Wed, Feb 9, 2011 at 7:12 PM, Efraim Fogel [via cgal-discuss] <[hidden 
> email] </user/SendEmail.jtp?type=node&node=3299358&i=0>> wrote:
>
>     nsoonhui wrote:
>      > 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)?
>      >  
>     You can construct a ray (or a long segment) in the given direction
>     emanating from the query point. Then, "walk" along the ray, in a
>     similar
>     way to the walk is applied by the Landmark point location; see
>     Arr_point_location/Arr_landmarks_pl_impl.h.
>
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