--- 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 -----
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:
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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