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我正在嘗試使用CGAL library examples之一來執行網格「差異」布爾操作。它的工作原理罰款的例子模型，但是當我嘗試引進我自己的簡單的網格，出現這種情況：CGAL的網格布爾操作
我試圖找出是什麼原因造成這一點 - 它必須是有毛病我模型，我猜？但綠黨和麪臨的一切似乎清醒了我。
下面是我使用的模型：
這裏是代碼：
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/corefinement.h>
#include <CGAL/Polygon_mesh_processing/remesh.h>
#include <CGAL/boost/graph/selection.h>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef boost::graph_traits<Mesh>::edge_descriptor edge_descriptor;
typedef boost::graph_traits<Mesh>::face_descriptor face_descriptor;
typedef boost::graph_traits<Mesh>::halfedge_descriptor halfedge_descriptor;
namespace PMP = CGAL::Polygon_mesh_processing;
namespace params = PMP::parameters;
struct Vector_pmap_wrapper {
std::vector<bool>& vect;
Vector_pmap_wrapper(std::vector<bool>& v) : vect(v) {}
friend bool get(const Vector_pmap_wrapper& m, face_descriptor f)
{
return m.vect[f];
}
friend void put(const Vector_pmap_wrapper& m, face_descriptor f, bool b)
{
m.vect[f] = b;
}
};
int main(int argc, char* argv[])
{
const char* filename1 = (argc > 1) ? argv[1] : "data/cube.off";
const char* filename2 = (argc > 2) ? argv[2] : "data/sphere.off";
std::ifstream input(filename1);
Mesh mesh1, mesh2;
if (!input || !(input >> mesh1))
{
std::cerr << "First mesh is not a valid off file." << std::endl;
return 1;
}
input.close();
input.open(filename2);
if (!input || !(input >> mesh2))
{
std::cerr << "Second mesh is not a valid off file." << std::endl;
return 1;
}
//create a property on edges to indicate whether they are constrained
Mesh::Property_map<edge_descriptor, bool> is_constrained_map =
mesh1.add_property_map<edge_descriptor, bool>("e:is_constrained", false).first;
// update mesh1 to contain the mesh bounding the difference
// of the two input volumes.
bool valid_difference =
PMP::corefine_and_compute_difference(mesh1,
mesh2,
mesh1,
params::all_default(), // default parameters for mesh1
params::all_default(), // default parameters for mesh2
params::edge_is_constrained_map(is_constrained_map));
if (valid_difference)
{
std::cout << "Difference was successfully computed\n";
std::ofstream output("difference.off");
output << mesh1;
}
else {
std::cout << "Difference could not be computed\n";
return 1;
}
// collect faces incident to a constrained edge
std::vector<face_descriptor> selected_faces;
std::vector<bool> is_selected(num_faces(mesh1), false);
BOOST_FOREACH(edge_descriptor e, edges(mesh1))
if (is_constrained_map[e])
{
// insert all faces incident to the target vertex
BOOST_FOREACH(halfedge_descriptor h,
halfedges_around_target(halfedge(e, mesh1), mesh1))
{
if (!is_border(h, mesh1))
{
face_descriptor f = face(h, mesh1);
if (!is_selected[f])
{
selected_faces.push_back(f);
is_selected[f] = true;
}
}
}
}
// increase the face selection
CGAL::expand_face_selection(selected_faces, mesh1, 2,
Vector_pmap_wrapper(is_selected), std::back_inserter(selected_faces));
std::cout << selected_faces.size()
<< " faces were selected for the remeshing step\n";
// remesh the region around the intersection polylines
PMP::isotropic_remeshing(
selected_faces,
0.02,
mesh1,
params::edge_is_constrained_map(is_constrained_map));
std::ofstream output("difference_remeshed.off");
output << mesh1;
return 0;
}
預先感謝您給任何人誰也許能協助！