CGAL location
 

While compiling OpenFOAM I ran into this error:

CGAL appears to be compiled properly at an early time, but it was located at:
Of course I can fix this problem manually quite easily. But I am working on a script to install OpenFOAM automatically. So where is the best place to fix this problem?

this answer can be easily given by wyldcat.....he is second to none...d best

issue
 

Hi Macelee, Have you found a better way to resolve it?



regards,


Nish

See file:
There you will find the definition thirdPartyPath which points to the installation directory of the third party packages:
This path is pointing to linux64Gcc if you're using Gcc compiler.

In the same file you will also see:
So if you're using CGAL-4.10, CGAL_ARCH_PATH becomes linux64Gcc/CGAL-4.10. And lib under this path is added to the list of libs inside the if condition.

You can modify here using sed if you want to automate it in a build script. For instance:

The problem when setting libraries is that you have a few ways that could be correct (or wrong). Treat either lib/ or lib64/ or both, or only include what is actually on disk.
Sometime you only want to add a library path if it really exists, sometimes it doesn't exists until the ThirdParty build is through.

For OpenFOAM-v1806, this problem is handled with some additional logic, bundled as a _foamAddLibAuto function.


If you want to auto explore lib/ and lib64/ but only use it if it exists:
If you want to do the same, but provide a fallback value if nothing has been compiled yet:
This particular fallback should generally be OK when used with the ThirdParty makeCGAL, since it now explicitly uses the same thing:

Delaunay triangulation 3D with CGAL
 

I am trying to use CGAL to do some Delaunay triangulation. I used one of the CGAL samples to compute a triangulation which includes a height field attribute.

The problem I have having is that I have no idea how to get the resulting triangulation. I figured out how to get the face_iterator, but I don't know what to do from there. What I'm hoping to get is an index into the point array for each of the 3 points on each triangle.

Im just wanna get smth like: Triang: triangle1 = (1,2,3) triangle2 = (3,4,1) where numbers its a vertices HELP PLEASE!!!

This is my code:

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Delaunay_triangulation_3.h>
#include <CGAL/Random.h>
#include <CGAL/Triangulation_3.h>
#include <CGAL/Delaunay_triangulation_cell_base_3.h>
#include <CGAL/Triangulation_vertex_base_with_info_3.h>


#include <vector>
#include <cassert>
#include <iostream>
#include <fstream>

using namespace std;

typedef CGAL::Exact_predicates_inexact_constructions_kerne l K;
typedef CGAL::Delaunay_triangulation_3<K, CGAL::Fast_location> Delaunay;
typedef Delaunay::Point Point;
typedef Delaunay::Vertex_handle Vertex_handle;
typedef Delaunay::Cell_handle Cell_handle;
typedef Delaunay::All_cells_iterator Cells_iterator;
typedef Delaunay::Vertex Vertex;

typedef CGAL::Triangulation_vertex_base_with_info_3<unsign ed, K> Vb;
typedef CGAL::Delaunay_triangulation_cell_base_3<K> Cb;
typedef CGAL::Triangulation_data_structure_3<Vb, Cb> Tds;

typedef Delaunay::Finite_vertices_iterator Finite_vertices_iterator;
typedef Delaunay::Finite_edges_iterator Finite_edges_iterator;
typedef Delaunay::Finite_facets_iterator Finite_facets_iterator;
typedef Delaunay::Finite_cells_iterator Finite_cells_iterator;
typedef Delaunay::Simplex Simplex;
typedef Delaunay::Locate_type Locate_type;




int main()
{
// generating points on a grid.
std::vector<Point> P;

for (int z = 0; z < 3; z++)
for (int y = 0; y < 3; y++)
for (int x = 0; x < 3; x++)
P.push_back(Point(x, y, z));

// building their Delaunay triangulation.
Delaunay T(P.begin(), P.end());
//assert(T.number_of_vertices() == 8000);

for (?????????)
{
????????????????????????
}

std::ofstream oFileT("output", std::ios::out);
// writing file output;
oFileT << T;
cout << T.is_valid() << endl;
return 0;
}
```