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# CGAL triangulation with constraints changes points coords

By : Cody Phanekham
Date : November 22 2020, 02:59 PM
hope this fix your issue No point coordinate can be changed. The only thing I can see that can happen is that your constraints intersects and the intersection point is added into the triangulation (and is mistaken for an input point). Of course this is only plausible is the intersection tag is not No_intersection_tag.
code :

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## CGAL triangulation fails

By : user2610555
Date : March 29 2020, 07:55 AM
Hope this helps I don't think you quite understand the geometry going on here, or triangulation, so I've drawn up some pictures.

## How to access the facets in a CGAL 3D triangulation?

By : user1477759
Date : March 29 2020, 07:55 AM
this will help I don't know precisely what you can to achieve. A 3D Delaunay triangulation is a decomposition of the convex hull of your points into tetrahedra. Any way, if you want to access the facets of a triangulation, you use the Finite_facets_iterator.
Something like:
code :
``````for (CGALTriangulation::Finite_facets_iterator it = T.finite_facets_begin();
it != T.finite_facets_end();
it++)
{
std::pair<CGALTriangulation::Cell_handle, int> facet = *it;
CGALTriangulation::Vertex_handle v1 = facet.first->vertex( (facet.second+1)%3 );
CGALTriangulation::Vertex_handle v2 = facet.first->vertex( (facet.second+2)%3 );
CGALTriangulation::Vertex_handle v3 = facet.first->vertex( (facet.second+3)%3 );
}
``````

## CGAL 2D Triangulation: Get only inner triangles

By : Matej Kultan
Date : March 29 2020, 07:55 AM
Hope that helps The face type of the triangultation has a member function is_in_domain()

## CGAL: Delaunay triangulation vs triangulation in CGAL's example

By : Raj Kumar
Date : March 29 2020, 07:55 AM
hope this fix your issue This leads to exactly the same results.
For a more detailed explanation: the periodic triangulation expects a triangulation data structure with vertices and faces that provide a certain number of functions and members, described by concepts (see P2T2 concepts). In CGAL 4.7, the vertex and face classes did not meet these requirements: they were missing some periodic information that is only used in a few functions of P2T2. However everything compiled and ran just fine because the examples did not call these few functions. Some more recent compilers were over-zealous and decided they wanted to be able to compile all functions of the class, even if those that were not called, and thus the vertex and base classes that were being used were not satisfying anymore.

## Triangulation face in cgal

By : David Jhonson
Date : March 29 2020, 07:55 AM
may help you . The triangle function expects a Face_handle as argument. I also simplify a bit the typedefs.