Hello,
What programming language do you use? I ask because
int main(array<System::String ^> ^args)
and
System.NullReferenceException
don't look like
C++
andreas
naresh wrote:
> Hi
> Can you change kernel for Vertex_base_for_ssr class as Exact_predicates_inexact_constructions_kernel ?
> I donot anything wrong in code it should work try to match similar kernel .
>
> ----- Original Message -----
> *From:* Query Cgal <mailto:
cgalquery@yahoo..com.hk>
> *To:*
> <mailto:
>
> *Sent:* Monday, March 23, 2009 10:13
AM
> *Subject:* Re: [cgal-discuss] incident_facets function of a Delaunay
> triangulation
>
> Hi, Sorry that I have sent an empty reply before because I have hot
> the wrong button.
>
> The line that I got the exception is the line
>
> Dt.incident_facets(start, back_inserter(f));
>
> and after I have chnaged the vector to a list, the exception still
> occur..
>
> Thanks
>
> --- *2009年3月23日 星期一，Query Cgal /<
> <mailto:
>>/* 寫道﹕
>
>
>
寄件人: Query Cgal <
cgalquery@yahoo..com.hk> <mailto:
>>
> 主題: Re: [cgal-discuss] incident_facets function of a Delaunay
> triangulation
> 收件人:
> 日期: 2009 3 23 星期一
上午 4:41
>
>
>
> --- *2009年3月23日 星期一，naresh /<
alexdowson@hotmail...com>/*
> 寫道﹕
>
>
> 寄件人: naresh <
>
> 主題: Re: [cgal-discuss] incident_facets function of a
> Delaunay triangulation
> 收件人:
>
日期: 2009 3 23 星期一 上午 4:33
>
>
> Hi
> in Which line you are getting System.NullReferenceException
> of code ?
> Hmmm... You can try this instead of this
> vector<Delaunay_triangulation::Facet> f; with
> list<Delaunay_triangulation::Facet> f;
>
try list instead of vector.
>
> ----- Original Message -----
> *From:* Query Cgal
> *To:*
> *Sent:* Monday, March 23, 2009 9:47 AM
> *Subject:* Re: [cgal-discuss] incident_facets function
> of a Delaunay
triangulation
>
> Hi.
>
> Thank you for your reply.
>
> Finally, I have tried with the following code to use the
> incident_facets function.
>
> int main(array<System::String ^> ^args)
> {
> Delaunay_triangulation Dt;
>
> Dt.insert(Point(0,0,0));
>
Dt.insert(Point(10,0,0));
> Dt.insert(Point(5,10,0));
> Dt.insert(Point(8,8,0));
> Dt...insert(Point(-3, -20, 0));
> Dt.insert(Point(-5,10,0));
>
>
> Finite_vertices_iterator start =
> Dt.finite_vertices_begin();
>
> vector<Delaunay_triangulation::Facet> f;
>
>
Dt.incident_facets(start, back_inserter(f));
>
> }
>
> However, when it has "System.NullReferenceException'
> May I ask is it due to the nature of the points that I
> have inserted into the triangulation?
>
> I am using CGAL-3.3.1 and Visual C++ 2005
> And I am using the triangulation with the following
> declaration.
> Thank you very much for
your help.
>
>
>
> typedef CGAL::Cartesian<double> Rep_class;
> typedef CGAL::Vector_3<Rep_class> Vector;
> typedef CGAL::Point_3<Rep_class> Point_3;
>
> typedef CGAL::Object CGAL_object;
>
>
>
> template < class GT, class Vb =
> CGAL::Triangulation_vertex_base_3<GT> >
> class Vertex_base_for_ssr
> :
public Vb
> {
> public:
> typedef typename Vb::Vertex_handle Vertex_handle;
> typedef typename Vb::Cell_handle Cell_handle;
> typedef typename Vb::Point Point;
>
> template < class TDS2 >
> struct Rebind_TDS {
> typedef typename Vb::template
>
Rebind_TDS<TDS2>::Other Vb2;
> typedef Vertex_base_for_ssr<GT,
> Vb2> Other;
> };
>
>
> Vector surface_normal;
> vector<Vertex_base_for_ssr<GT, Vb> *>
> neighbor_vertex_handle;
> double fifth_nearest_dist;
>
>
>
int surface_label;
> bool is_safe;
>
>
>
> Vertex_base_for_ssr() : Vb()
> {
> surface_label = -1;
> is_safe = false;
> }
>
> Vertex_base_for_ssr(const Point& p)
> : Vb(p)
>
{
> coordinate[0] = p.x();
> coordinate[1] = p.y();
> coordinate[2] = p.z();
> surface_label = -1;
> is_safe = false;
> }
>
>
> Vertex_base_for_ssr(const Point& p, Cell_handle c)
> : Vb(p,
c)
> {
> surface_label = -1;
> is_safe = false;
> }
>
> void set_surface_normal(double x_i, double y_i, double
> z_i)
> {
> surface_normal = Vector(x_i, y_i, z_i);
> }
>
>
Vector get_surface_normal()
> {
> return surface_normal;
> }
>
> Point get_point()
> {
> return Vb::point();
> }
>
> double coordinate[3];
>
> void
set_coordiante()
> {
> coordinate[0] = point().x();
> coordinate[1] = point().y();
> coordinate[2] = point().z();
> }
> };
>
> typedef
> CGAL::Exact_predicates_inexact_constructions_kernel K;
> typedef
>
CGAL::Triangulation_data_structure_3<Vertex_base_for_ssr<K>
> > Tds;
> typedef CGAL::Delaunay_triangulation_3<K, Tds>
> Delaunay_triangulation;
>
>
>
>
>
> --- 2009年3月21日 星期六，naresh
> <
> 寫道﹕
>
>
> 寄件人: naresh <
>
> 主題: Re:
[cgal-discuss] incident_facets function of
> a Delaunay triangulation
> 收件人:
> 日期: 2009 3 21 星期六 下午 1:47
>
>
> Hi
>
>>In fact, I am dealing with a 3D triangulation
> (sorry that I forgot to mention that it is 3D in the
> >>previous post.)
> >>and therefore, I cannot use Facet since Facet is
> not represented in 3D triangulation.
> >>So, what should I do to use incident_facets() of a
> 3D triangulation.
>
I donot know which triangulation are you using. for
> simple triangulation here there you can define Facet
> easily .. here is code..
> try to modifiy with ur code
> typedef
> CGAL::Exact_predicates_inexact_constructions_kernel K;
>
> typedef CGAL::Triangulation_3<K> Triangulation;
>
>
typedef Triangulation::Facet Facet;
>
> If there is still confusion post some code . But i
> will not able reply today because saturday now and i am
> off. :) I can reply on monday.
>
>
> Hope this helps
>
> Alex
>
>
> ----- Original Message -----
> From: Query Cgal
> To:
..fr> Sent: Saturday, March 21, 2009 6:46 PM
> Subject: Re: [cgal-discuss] incident_facets
>
function of a Delaunay triangulation
>
> THank you for your reply.
>
> In fact, I am dealing with a 3D triangulation
> (sorry that I forgot to mention that it is 3D in the
> previous post.)
> and therefore, I cannot use Facet since Facet is
> not represented in 3D triangulation.
> So, what should I do to use
incident_facets() of
> a 3D triangulation.
>
> Thank you
>
>
>
> --- 2009年3月21日 星期六，naresh
> <
> 寫道﹕
>
>
> 寄件人: naresh <
>
>
主題: Re: [cgal-discuss] incident_facets
> function of a Delaunay triangulation
> 收件人:
> 日期: 2009 3 21 星期六 下午 1:07
>
>
> Hi
>
I think you should try like this
> typedef Trianluation_2::Facet Facet; //
> something here that you had used in ur programme may
> different i had showed only example
> vector<Facet> f;
>
Dt.incident_facets(start, back_inserter(f));
>
> ----- Original Message -----
> From: Query Cgal
> To:
>
Sent: Saturday, March 21, 2009 5:45 PM
> Subject: [cgal-discuss] incident_facets
> function of a Delaunay triangulation
>
> Hi, I have tried to use the function below
>
> template <class OutputIterator>
> OutputIterator t.incident_facets (
>
Vertex_handle v, OutputIterator facets)
>
> Copies all Facets incident to v to
> the output iterator facets. Returns the resulting output
> iterator.
> Precondition: t..dimension() >1 , v
> Vertex_handle(), t.is_vertex(v)..
>
When I tried to used it in the following
> way but it didn't work,
>
> vector<Finite_facets_iterator> f;
> Dt.incident_facets(start, back_inserter(f));
>
> May I ask in what other way should I use
> the Output iterator then ?
>
>
Thank you
>
>
>
>
>
>
>
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