mirror of https://github.com/CGAL/cgal
134 lines
5.6 KiB
C++
134 lines
5.6 KiB
C++
#ifndef CGAL_SURFACE_MESH_APPROXIMATION_VSA_MESH_SEGMENTATION_H
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#define CGAL_SURFACE_MESH_APPROXIMATION_VSA_MESH_SEGMENTATION_H
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#include <CGAL/license/Surface_mesh_approximation.h>
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#include <CGAL/vsa_metrics.h>
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#include <CGAL/vsa_approximation.h>
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#include <CGAL/internal/Surface_mesh_approximation/named_function_params.h>
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#include <CGAL/internal/Surface_mesh_approximation/named_params_helper.h>
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#include <CGAL/Polyhedron_3.h>
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#include <CGAL/property_map.h>
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#include <boost/graph/graph_traits.hpp>
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#include <boost/optional.hpp>
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namespace CGAL {
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namespace VSA {
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/*!
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* \ingroup PkgTSMA
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* @brief variational shape approximation segmentation a triangulated mesh.
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* This function segment the input triangulated mesh by the variational shape approximation algorithm.
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* It fills a property map which associates a segment-id (in [0, number_of_segments -1])
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* or a proxy-id (in [0, number_of_proxies-1]) to each facet.
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* A segment is a set of connected facets which are placed under the same proxy patch (see \cgalFigureRef{relaxation}).
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*
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* @tparam TriangleMesh model of `FaceGraph`.
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* The descriptor types `boost::graph_traits<TriangleMesh>::%face_descriptor`
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* and `boost::graph_traits<TriangleMesh>::%halfedge_descriptor` must be
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* models of `Hashable`.
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* If `TriangleMesh` has an internal property map for `CGAL::face_index_t`,
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* and no `face_index_map` is given
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* as a named parameter, then the internal one should be initialized
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* @tparam SegmentPropertyMap a ReadWritePropertyMap with
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* `boost::graph_traits<TriangleMesh>::%face_descriptor` as key and `std::size_t` as value type
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* @tparam NamedParameters a sequence of \ref namedparameters
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*
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* @param tm_in a triangulated surface mesh to be segmented
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* @param[out] segment_ids the segment or proxy id of each facet
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* @param np optional sequence of \ref namedparameters among the ones listed below
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*
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* \cgalNamedParamsBegin
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* \cgalParamBegin{geom_traits} a geometric traits class instance, model of `Kernel`.
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* Exact constructions kernels are not supported by this function.
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* \cgalParamEnd
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* \cgalParamBegin{vertex_point_map} the property map with the points associated
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* to the vertices of `tm_in`. Instance of a class model of `ReadWritePropertyMap`.
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* \cgalParamEnd
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* \cgalParamBegin{init_method} the selection of seed initialization method.
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* \cgalParamEnd
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* \cgalParamBegin{max_nb_proxies} the maximum number of proxies is reached.
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* \cgalParamEnd
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* \cgalParamBegin{min_error_drop} the minimum error drop of the approximation.
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* \cgalParamEnd
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* \cgalParamBegin{iterations} the relaxation iterations after seeding.
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* \cgalParamEnd
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* \cgalParamBegin{inner_iterations} the relaxation iterations when seeding.
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* \cgalParamEnd
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* \cgalParamBegin{face_proxy_map} a property map containing the assigned proxy index of each face of `tm_in`
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* \cgalParamEnd
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* \cgalParamBegin{proxies} the plane proxies
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* \cgalParamEnd
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* \cgalNamedParamsEnd
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*/
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template <typename TriangleMesh,
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typename SegmentPropertyMap,
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typename NamedParameters>
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void mesh_segmentation(const TriangleMesh &tm_in,
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const SegmentPropertyMap segment_ids, const NamedParameters &np)
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{
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using boost::get_param;
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using boost::choose_param;
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typedef typename GetGeomTraits<TriangleMesh, NamedParameters>::type Geom_traits;
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typedef typename Geom_traits::FT FT;
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typedef typename GetVertexPointMap<TriangleMesh, NamedParameters>::type Vertex_point_map;
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Vertex_point_map point_pmap = choose_param(get_param(np, internal_np::vertex_point),
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get_property_map(vertex_point, const_cast<TriangleMesh &>(tm_in)));
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typedef CGAL::VSA::Mesh_approximation<TriangleMesh, Vertex_point_map> L21_approx;
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typedef typename L21_approx::Error_metric L21_metric;
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typedef typename L21_approx::Proxy_fitting L21_proxy_fitting;
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L21_approx approx(tm_in, point_pmap);
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L21_metric l21_metric(tm_in);
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L21_proxy_fitting l21_fitting(tm_in);
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approx.set_metric(l21_metric, l21_fitting);
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// default hierarchical initialization
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CGAL::VSA::Seeding method = choose_param(
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get_param(np, internal_np::init_method), CGAL::VSA::Hierarchical);
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boost::optional<std::size_t> max_nb_proxies = choose_param(
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get_param(np, internal_np::max_nb_proxies), boost::optional<std::size_t>());
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boost::optional<FT> min_error_drop = choose_param(
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get_param(np, internal_np::min_error_drop), boost::optional<FT>());
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std::size_t inner_iterations = choose_param(get_param(np, internal_np::inner_iterations), 5);
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approx.init(method, max_nb_proxies, min_error_drop, inner_iterations);
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const std::size_t iterations = choose_param(get_param(np, internal_np::iterations), 10);
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approx.run(iterations);
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#ifdef CGAL_SURFACE_MESH_APPROXIMATION_DEBUG
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std::cout << "#px = " << approx.get_proxies_sizes()
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<< ", #itr = " << iterations
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<< ", #inner_itr = " << inner_iterations << std::endl;
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#endif
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approx.get_proxy_map(segment_ids);
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typedef typename boost::lookup_named_param_def<
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internal_np::facet_proxy_map_t,
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NamedParameters,
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internal_np::vsa_no_output_t>::type FPMap;
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FPMap fproxymap = choose_param(
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get_param(np, internal_np::facet_proxy_map), internal_np::vsa_no_output);
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get_proxy_map(approx, fproxymap);
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typedef typename boost::lookup_named_param_def <
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internal_np::proxies_t,
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NamedParameters,
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internal_np::vsa_no_output_t>::type ProxiesOutItr;
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ProxiesOutItr pxies_out_itr = choose_param(
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get_param(np, internal_np::proxies), internal_np::vsa_no_output);
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get_proxies(approx, pxies_out_itr);
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}
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} // end namespace VSA
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} // end namespace CGAL
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#endif // CGAL_SURFACE_MESH_APPROXIMATION_VSA_MESH_SEGMENTATION_H
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