/usr/include/CGAL/vcm_estimate_edges.h is in libcgal-dev 4.11-2build1.
This file is owned by root:root, with mode 0o644.
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// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
// Author(s) : Jocelyn Meyron and Quentin Mérigot
//
#ifndef CGAL_VCM_ESTIMATE_EDGES_H
#define CGAL_VCM_ESTIMATE_EDGES_H
#include <CGAL/license/Point_set_processing_3.h>
#include <CGAL/vcm_estimate_normals.h>
namespace CGAL {
/// \ingroup PkgPointSetProcessingAlgorithms
/// determines if a point is on a sharp feature edge from a point set
/// for which the Voronoi covariance Measures have been computed.
///
/// The sharpness of the edge, specified by parameter `threshold`,
/// is used to filtered points according to the external angle around a sharp feature.
///
/// A point is considered to be on a sharp feature if the external angle `alpha` at the edge is such that
/// `alpha >= 2 / sqrt(3) * sqrt(threshold)`.
/// In particular this means that if the input contains sharp features
/// with different external angles, the one with the smallest external angle should be considered,
/// which however would result in selecting more points on sharper regions.
/// More details are provided in \cgalCite{cgal:mog-vbcfe-11}.
///
/// \tparam VCMTraits is a model of `DiagonalizeTraits`. It can be
/// omitted: if Eigen 3 (or greater) is available and
/// `CGAL_EIGEN3_ENABLED` is defined then an overload using
/// `Eigen_diagonalize_traits` is provided. Otherwise, the internal
/// implementation `Diagonalize_traits` is used.
/// \sa CGAL::compute_vcm()`
///
template <class FT, class VCMTraits>
bool
vcm_is_on_feature_edge (cpp11::array<FT,6> &cov,
double threshold,
VCMTraits)
{
cpp11::array<double,3> eigenvalues;
if (!VCMTraits::
diagonalize_selfadjoint_covariance_matrix(cov, eigenvalues) )
{
return false;
}
// Compute the ratio
double r = eigenvalues[1] / (eigenvalues[0] + eigenvalues[1] + eigenvalues[2]);
if (r >= threshold)
return true;
return false;
}
template <class FT>
bool
vcm_is_on_feature_edge (cpp11::array<FT,6> &cov,
double threshold)
{
return vcm_is_on_feature_edge(cov, threshold,
CGAL::Default_diagonalize_traits<double, 3>());
}
} // namespace CGAL
#endif // CGAL_VCM_ESTIMATE_EDGES_H
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