CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 02/19/2015 02:54 PM, thierry Fernandez wrote:
> Ok, it's a godd news.
>
> I d'ont know why, but my VC++ d'ont find the include Exact_integer.h
It was introduced in CGAL-4.5

Sebastien.

> In fact i have a city with bulidings and streets , and the bounding box.
>
> I have to cut the empty space in biggest convex volumes .
>
> so i want to construct the scene with boolean operation on plane, and
> use convex decomposition of polyedrons.
>
>
>
> 2015-02-19 14:15 GMT+01:00 Sebastien Loriot (GeometryFactory)
> <
>  
> <mailto:>>:
>
>     On 02/19/2015 02:08 PM, thierry Fernandez wrote:
>
>         I watched these pages, but why integers?
>
>
>     The example is using homogenous coordinates which is why an integer
>     type is sufficient.
>     If you use CGAL::Extended_cartesian then you can use a rational type.
>
>     http://doc.cgal.org/latest/__Nef_2/classCGAL_1_1Extended____cartesian.html
>     <http://doc.cgal.org/latest/Nef_2/classCGAL_1_1Extended__cartesian.html>
>
>     Side remark: if you're looking for the close intersection of a set of
>     halfspaces then a function doing exactly this will be included in the
>     next release of CGAL (the beta is expected before the end of the month).
>
>
>     Sebastien.
>
>
>         2015-02-19 11:29 GMT+01:00 Sebastien Loriot (GeometryFactory)
>         
> <
>  
> <mailto:>
>         
> <mailto:
>  
> <mailto:>>>__:
>
>              On 02/19/2015 10:01 AM, thierry Fernandez wrote:
>
>                  ok but i want to construct Nef_Polyedron_3 with
>         plane_3, and this 2
>                  kernels doesn't work.
>
>
>              Sorry for not having guessed, my daughter broke my crystal ball
>              recently.
>
>              You're in the unlucky case where you indeed need to use an
>         extended
>              kernel like in this example:
>         
> http://doc.cgal.org/latest/____Nef_3/index.html#Nef_____3UsinganExtendedKernel
>         
> <http://doc.cgal.org/latest/__Nef_3/index.html#Nef___3UsinganExtendedKernel>
>
>         
> <http://doc.cgal.org/latest/__Nef_3/index.html#Nef___3UsinganExtendedKernel
>         
> <http://doc.cgal.org/latest/Nef_3/index.html#Nef_3UsinganExtendedKernel>>
>              See also:
>         
> http://doc.cgal.org/latest/____Nef_3/index.html#sectionNef_____3InfiBox
>         <http://doc.cgal.org/latest/__Nef_3/index.html#sectionNef___3InfiBox>
>
>         <http://doc.cgal.org/latest/__Nef_3/index.html#sectionNef___3InfiBox
>         <http://doc.cgal.org/latest/Nef_3/index.html#sectionNef_3InfiBox>>
>
>              Sebastien.
>
>
>                  2015-02-19 9:21 GMT+01:00 Sebastien Loriot
>         (GeometryFactory)
>                  
> <
>  
> <mailto:>
>         
> <mailto:
>  
> <mailto:>>
>                  
> <mailto:
>         
> <mailto:>
>  
> <mailto:
>         
> <mailto:>>>__>__:
>
>                       On 02/18/2015 04:14 PM, tfern90 wrote:
>
>                           why so many kernel in cgal ????
>
>                       See http://www.cgal.org/FAQ.html#______kernels
>         <http://www.cgal.org/FAQ.html#____kernels>
>                  <http://www.cgal.org/FAQ.html#____kernels
>         <http://www.cgal.org/FAQ.html#__kernels>>
>                       <http://www.cgal.org/FAQ.html#____kernels
>         <http://www.cgal.org/FAQ.html#__kernels>
>                  <http://www.cgal.org/FAQ.html#__kernels
>         <http://www.cgal.org/FAQ.html#kernels>>>
>
>                       In practice,
>                  Exact_predicates_inexact_______constructions_kernel and
>                       Exact_predicates_exact_______constructions_kernel
>         will fit
>                  most of the
>                       needs.
>
>                       Sebastien.
>
>
>
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