mirror of https://github.com/CGAL/cgal
add default L21 metric API
This commit is contained in:
Lingjie Zhu
parent
e07db9f714
commit
92c479921b
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@ -2,7 +2,9 @@
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#define CGAL_SURFACE_MESH_APPROXIMATION_VSA_MESH_APPROXIMATION_H
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#include <CGAL/internal/Surface_mesh_approximation/VSA.h>
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#include <CGAL/vsa_mesh_approximation_traits.h>
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#include <CGAL/property_map.h>
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#include <boost/graph/graph_traits.hpp>
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namespace CGAL
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{
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@ -262,6 +264,233 @@ void vsa_approximate_and_extract(
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BOOST_FOREACH(const typename VSA_mesh_extraction::Anchor &a, extractor.collect_anchors())
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pos.push_back(a.pos);
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}
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/*!
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* \ingroup PkgTSMA
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* @brief Using the VSA algorithm to approximate a triangle mesh.
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* This function approximate the input mesh by fitting it with proxies.
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* Facet proxy index output only.
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* Use default L21 metric.
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*
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* @tparam TriangleMesh model of `FaceGraph`.
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* @tparam FacetProxyMap a property map containing the approximated facet patch id,
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and `boost::graph_traits<TriangleMesh>::%face_descriptor` as key type,
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std::size_t as value type
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* @param tm a triangle mesh
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* @param[out] f_proxy_pmap facet proxy patch id property map
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* @param init select seed initialization
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* @param number_of_segments target number of approximation patches
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* @param number_of_iterations number of fitting iterations
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*/
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template<typename TriangleMesh,
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typename FacetProxyMap>
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void vsa_approximate(
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const TriangleMesh &tm,
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FacetProxyMap f_proxy_pmap,
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const int init,
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const std::size_t number_of_segments,
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const std::size_t number_of_iterations) {
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// CGAL_precondition(is_pure_triangle(tm));
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typedef typename TriangleMesh::Traits GeomTraits;
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typedef typename GeomTraits::FT FT;
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typedef typename GeomTraits::Vector_3 Vector_3;
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typedef typename GeomTraits::Point_3 Point_3;
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typedef typename boost::graph_traits<TriangleMesh>::face_descriptor face_descriptor;
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typedef typename boost::graph_traits<TriangleMesh>::halfedge_descriptor halfedge_descriptor;
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typedef boost::associative_property_map<std::map<face_descriptor, Vector_3> > FacetNormalMap;
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typedef boost::associative_property_map<std::map<face_descriptor, FT> > FacetAreaMap;
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typedef boost::property_map<TriangleMesh, boost::vertex_point_t>::type VertexPointMap;
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typedef CGAL::PlaneProxy<TriangleMesh> PlaneProxy;
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typedef CGAL::L21Metric<PlaneProxy, FacetNormalMap, FacetAreaMap> L21Metric;
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typedef CGAL::L21ProxyFitting<PlaneProxy, L21Metric, FacetNormalMap, FacetAreaMap> L21ProxyFitting;
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typedef CGAL::PlaneFitting<TriangleMesh, FacetAreaMap, FacetNormalMap, VertexPointMap> PlaneFitting;
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typedef CGAL::L21ApproximationTrait<PlaneProxy, TriangleMesh, L21Metric, L21ProxyFitting, PlaneFitting, VertexPointMap, FacetNormalMap, FacetAreaMap> L21ApproximationTrait;
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VertexPointMap point_pmap = get(boost::vertex_point, const_cast<TriangleMesh &>(tm));
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// construct facet normal & area map
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std::map<face_descriptor, Vector_3> facet_normals;
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std::map<face_descriptor, FT> facet_areas;
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BOOST_FOREACH(face_descriptor f, faces(tm)) {
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const halfedge_descriptor he = halfedge(f, tm);
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const Point_3 p0 = point_pmap[source(he, tm)];
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const Point_3 p1 = point_pmap[target(he, tm)];
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const Point_3 p2 = point_pmap[target(next(he, tm), tm)];
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Vector_3 normal = CGAL::unit_normal(p0, p1, p2);
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facet_normals.insert(std::pair<face_descriptor, Vector_3>(f, normal));
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FT area(std::sqrt(CGAL::to_double(CGAL::squared_area(p0, p1, p2))));
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facet_areas.insert(std::pair<face_descriptor, FT>(f, area));
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}
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FacetNormalMap normal_pmap(facet_normals);
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FacetAreaMap area_pmap(facet_areas);
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vsa_approximate(tm,
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f_proxy_pmap,
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L21ApproximationTrait(tm, point_pmap, normal_pmap, area_pmap),
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init,
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number_of_segments,
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number_of_iterations);
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}
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/*!
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* \ingroup PkgTSMA
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* @brief Using the VSA algorithm to extract the approximated surface mesh.
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* This function approximate the input triangulated mesh by fitting it with proxies.
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* Approximated triangle mesh output only.
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* Use default L21 metric.
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*
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* @tparam TriangleMesh model of `FaceGraph`.
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* @tparam AnchorIndexContainer a container of approximated indexed triangle soup
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* @tparam AnchorPositionContainer a container of extracted anchor position
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* @param tm a triangle mesh
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* @param[out] tris approximation indexed triangle soup
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* @param[out] pos anchor position container
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* @param init select seed initialization
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* @param number_of_segments target number of approximation patches
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* @param number_of_iterations number of fitting iterations
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*/
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template<typename TriangleMesh,
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typename AnchorIndexContainer,
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typename AnchorPositionContainer>
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void vsa_extract(
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const TriangleMesh &tm,
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AnchorIndexContainer &tris,
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AnchorPositionContainer &pos,
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const int init,
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const std::size_t number_of_segments,
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const std::size_t number_of_iterations) {
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// CGAL_precondition(is_pure_triangle(tm));
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typedef typename TriangleMesh::Traits GeomTraits;
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typedef typename GeomTraits::FT FT;
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typedef typename GeomTraits::Vector_3 Vector_3;
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typedef typename GeomTraits::Point_3 Point_3;
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typedef typename boost::graph_traits<TriangleMesh>::face_descriptor face_descriptor;
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typedef typename boost::graph_traits<TriangleMesh>::halfedge_descriptor halfedge_descriptor;
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typedef boost::associative_property_map<std::map<face_descriptor, Vector_3> > FacetNormalMap;
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typedef boost::associative_property_map<std::map<face_descriptor, FT> > FacetAreaMap;
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typedef boost::property_map<TriangleMesh, boost::vertex_point_t>::type VertexPointMap;
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typedef CGAL::PlaneProxy<TriangleMesh> PlaneProxy;
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typedef CGAL::L21Metric<PlaneProxy, FacetNormalMap, FacetAreaMap> L21Metric;
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typedef CGAL::L21ProxyFitting<PlaneProxy, L21Metric, FacetNormalMap, FacetAreaMap> L21ProxyFitting;
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typedef CGAL::PlaneFitting<TriangleMesh, FacetAreaMap, FacetNormalMap, VertexPointMap> PlaneFitting;
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typedef CGAL::L21ApproximationTrait<PlaneProxy, TriangleMesh, L21Metric, L21ProxyFitting, PlaneFitting, VertexPointMap, FacetNormalMap, FacetAreaMap> L21ApproximationTrait;
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VertexPointMap point_pmap = get(boost::vertex_point, const_cast<TriangleMesh &>(tm));
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// construct facet normal & area map
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std::map<face_descriptor, Vector_3> facet_normals;
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std::map<face_descriptor, FT> facet_areas;
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BOOST_FOREACH(face_descriptor f, faces(tm)) {
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const halfedge_descriptor he = halfedge(f, tm);
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const Point_3 p0 = point_pmap[source(he, tm)];
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const Point_3 p1 = point_pmap[target(he, tm)];
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const Point_3 p2 = point_pmap[target(next(he, tm), tm)];
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Vector_3 normal = CGAL::unit_normal(p0, p1, p2);
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facet_normals.insert(std::pair<face_descriptor, Vector_3>(f, normal));
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FT area(std::sqrt(CGAL::to_double(CGAL::squared_area(p0, p1, p2))));
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facet_areas.insert(std::pair<face_descriptor, FT>(f, area));
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}
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FacetNormalMap normal_pmap(facet_normals);
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FacetAreaMap area_pmap(facet_areas);
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typedef typename boost::associative_property_map<std::map<face_descriptor, std::size_t> > FacetProxyMap;
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std::map<face_descriptor, std::size_t> facet_proxy_map;
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BOOST_FOREACH(face_descriptor f, faces(tm))
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facet_proxy_map.insert(std::pair<face_descriptor, std::size_t>(f, 0));
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FacetProxyMap f_proxy_pmap(facet_proxy_map);
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vsa_extract(tm,
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tris,
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pos,
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L21ApproximationTrait(tm, point_pmap, normal_pmap, area_pmap),
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init,
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number_of_segments,
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number_of_iterations);
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}
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/*!
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* \ingroup PkgTSMA
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* @brief Triangle mesh variational shape approximation.
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* This function approximate the input triangulated mesh by fitting it with proxies.
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* Facet proxy index and approximated triangle mesh output.
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* Use default L21 metric.
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*
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* @tparam TriangleMesh model of `FaceGraph`.
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* @tparam FacetProxyMap a property map containing the approximated facet patch id,
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and `boost::graph_traits<TriangleMesh>::%face_descriptor` as key type,
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std::size_t as value type
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* @tparam AnchorIndexContainer a container of approximated indexed triangle soup
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* @tparam AnchorPositionContainer a container of extracted anchor position
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* @param tm a triangle mesh
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* @param[out] f_proxy_pmap facet proxy patch id property map
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* @param[out] tris approximation indexed triangle soup
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* @param[out] pos anchor position container
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* @param init select seed initialization
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* @param number_of_segments target number of approximation patches
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* @param number_of_iterations number of fitting iterations
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*/
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template<typename TriangleMesh,
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typename FacetProxyMap,
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typename AnchorIndexContainer,
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typename AnchorPositionContainer>
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void vsa_approximate_and_extract(
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const TriangleMesh &tm,
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FacetProxyMap f_proxy_pmap,
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AnchorIndexContainer &tris,
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AnchorPositionContainer &pos,
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const int init,
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const std::size_t number_of_segments,
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const std::size_t number_of_iterations) {
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// CGAL_precondition(is_pure_triangle(tm));
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typedef typename TriangleMesh::Traits GeomTraits;
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typedef typename GeomTraits::FT FT;
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typedef typename GeomTraits::Vector_3 Vector_3;
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typedef typename GeomTraits::Point_3 Point_3;
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typedef typename boost::graph_traits<TriangleMesh>::face_descriptor face_descriptor;
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typedef typename boost::graph_traits<TriangleMesh>::halfedge_descriptor halfedge_descriptor;
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typedef boost::associative_property_map<std::map<face_descriptor, Vector_3> > FacetNormalMap;
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typedef boost::associative_property_map<std::map<face_descriptor, FT> > FacetAreaMap;
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typedef boost::property_map<TriangleMesh, boost::vertex_point_t>::type VertexPointMap;
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typedef CGAL::PlaneProxy<TriangleMesh> PlaneProxy;
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typedef CGAL::L21Metric<PlaneProxy, FacetNormalMap, FacetAreaMap> L21Metric;
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typedef CGAL::L21ProxyFitting<PlaneProxy, L21Metric, FacetNormalMap, FacetAreaMap> L21ProxyFitting;
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typedef CGAL::PlaneFitting<TriangleMesh, FacetAreaMap, FacetNormalMap, VertexPointMap> PlaneFitting;
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typedef CGAL::L21ApproximationTrait<PlaneProxy, TriangleMesh, L21Metric, L21ProxyFitting, PlaneFitting, VertexPointMap, FacetNormalMap, FacetAreaMap> L21ApproximationTrait;
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VertexPointMap point_pmap = get(boost::vertex_point, const_cast<TriangleMesh &>(tm));
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// construct facet normal & area map
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std::map<face_descriptor, Vector_3> facet_normals;
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std::map<face_descriptor, FT> facet_areas;
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BOOST_FOREACH(face_descriptor f, faces(tm)) {
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const halfedge_descriptor he = halfedge(f, tm);
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const Point_3 p0 = point_pmap[source(he, tm)];
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const Point_3 p1 = point_pmap[target(he, tm)];
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const Point_3 p2 = point_pmap[target(next(he, tm), tm)];
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Vector_3 normal = CGAL::unit_normal(p0, p1, p2);
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facet_normals.insert(std::pair<face_descriptor, Vector_3>(f, normal));
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FT area(std::sqrt(CGAL::to_double(CGAL::squared_area(p0, p1, p2))));
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facet_areas.insert(std::pair<face_descriptor, FT>(f, area));
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}
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FacetNormalMap normal_pmap(facet_normals);
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FacetAreaMap area_pmap(facet_areas);
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L21ApproximationTrait app_trait(tm, point_pmap, normal_pmap, area_pmap);
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vsa_approximate_and_extract(tm,
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f_proxy_pmap,
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tris,
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pos,
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app_trait,
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init,
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number_of_segments,
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number_of_iterations);
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}
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} // end namespace CGAL
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#endif // CGAL_SURFACE_MESH_APPROXIMATION_VSA_MESH_APPROXIMATION_H
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