CGAL学习记录——网格孔洞填充

CGAL——孔洞填充

效果展示

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在这里插入图片描述

代码

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/triangulate_hole.h>
#include <CGAL/Polygon_mesh_processing/border.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <fstream>
#include <vector>
#include <set>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::Point_3                                     Point;
typedef CGAL::Surface_mesh<Point>                           Mesh;
typedef boost::graph_traits<Mesh>::vertex_descriptor        vertex_descriptor;
typedef boost::graph_traits<Mesh>::halfedge_descriptor      halfedge_descriptor;
typedef boost::graph_traits<Mesh>::face_descriptor          face_descriptor;
namespace PMP = CGAL::Polygon_mesh_processing;
bool is_small_hole(halfedge_descriptor h, Mesh& mesh,
    double max_hole_diam, int max_num_hole_edges)
{
    int num_hole_edges = 0;
    CGAL::Bbox_3 hole_bbox;
    for (halfedge_descriptor hc : CGAL::halfedges_around_face(h, mesh))
    {
        const Point& p = mesh.point(target(hc, mesh));
        hole_bbox += p.bbox();
        ++num_hole_edges;
        // Exit early, to avoid unnecessary traversal of large holes
        if (num_hole_edges > max_num_hole_edges) return false;
        if (hole_bbox.xmax() - hole_bbox.xmin() > max_hole_diam) return false;
        if (hole_bbox.ymax() - hole_bbox.ymin() > max_hole_diam) return false;
        if (hole_bbox.zmax() - hole_bbox.zmin() > max_hole_diam) return false;
    }
    return true;
}
// Incrementally fill the holes that are no larger than given diameter
// and with no more than a given number of edges (if specified).
int main(int argc, char* argv[])
{
    //读取网格数据
    const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("data/mech-holes-shark.off");
    Mesh mesh;
    if (!PMP::IO::read_polygon_mesh(filename, mesh))
    {
        std::cerr << "Invalid input." << std::endl;
        return 1;
    }

    // 参数设置
    double max_hole_diam = (argc > 2) ? boost::lexical_cast<double>(argv[2]) : -1.0;
    int max_num_hole_edges = (argc > 3) ? boost::lexical_cast<int>(argv[3]) : -1;
    unsigned int nb_holes = 0;
    std::vector<halfedge_descriptor> border_cycles;
    
    //孔洞填充
    PMP::extract_boundary_cycles(mesh, std::back_inserter(border_cycles));
    for (halfedge_descriptor h : border_cycles)
    {
        if (max_hole_diam > 0 && max_num_hole_edges > 0 && !is_small_hole(h, mesh, max_hole_diam, max_num_hole_edges))
            continue;
        std::vector<face_descriptor>  patch_facets;
        std::vector<vertex_descriptor> patch_vertices;
        bool success = std::get<0>(PMP::triangulate_refine_and_fair_hole(mesh, h,std::back_inserter(patch_facets),std::back_inserter(patch_vertices)));

        std::cout << "* Number of facets in constructed patch: " << patch_facets.size() << std::endl;
        std::cout << "  Number of vertices in constructed patch: " << patch_vertices.size() << std::endl;
        std::cout << "  Is fairing successful: " << success << std::endl;
        ++nb_holes;
    }
    std::cout << nb_holes << " 孔洞填充完毕" << std::endl;

    //保存网格
    CGAL::IO::write_polygon_mesh("filled_SM.off", mesh, CGAL::parameters::stream_precision(17));
    return 0;
}

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