CGAL users discussion list

[gupta61 <>]

Hi,

I am trying to find the accuracy of the methods

/CGAL_AABB_Poly_Segment_Tree<CGAL_Kernel_for_AABB>::closest_point_and_primitive
CGAL_AABB_Tree<CGAL_Kernel_for_AABB>::closest_point_and_primitive/

with different "CGAL_Kernel_for_AABB". 

As I understand right now, to guarantee the accuracy of certain methods when
using CGAL AABB tree, for example, intersection calculations require us to
use CGAL::Exact_predicates_exact_constructions_kernel (Refer:
http://cgal-discuss.949826.n4.nabble.com/Bug-in-Segment-Triangle-intersection-td4584602.html).
Is this also a requirement for closest_point_and_primitive method? 

I also realize that using CGAL::Exact_predicates_exact_constructions_kernel
is not thread safe (Refer:
http://cgal-discuss.949826.n4.nabble.com/Thread-safety-in-CGAL-AABB-tree-td4661127.html)
when calling the method closest_point_and_primitive? However, the
CGAL::Exact_predicates_inexact_constructions_kernel is thread safe.

So my question is can I use the method "closest_point_and_primitive" with
CGAL::Exact_predicates_inexact_constructions_kernel while guaranteeing the
accuracy? Does anyone have a list of methods which require
"CGAL::Exact_predicates_exact_constructions_kernel" to guarantee the
accuracy. 

Thanks.



-----
Piyush Gupta
UIUC
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