Files
ConformalLabpp/code/include/mesh_utils.hpp
2026-03-17 21:18:59 +02:00

48 lines
1.4 KiB
C++

#pragma once
#include <CGAL/Surface_mesh.h>
#include <Eigen/Dense>
#include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
namespace mesh_utils {
template <typename Kernel>
void cgal_to_eigen(CGAL::Surface_mesh<typename Kernel::Point_3>& mesh,
Eigen::MatrixXd& V, Eigen::MatrixXi& F) {
CGAL::Polygon_mesh_processing::triangulate_faces(mesh);
V.resize(mesh.num_vertices(), 3);
F.resize(mesh.num_faces(), 3);
for (auto v : mesh.vertices()) {
auto p = mesh.point(v);
V.row(v.idx()) << p.x(), p.y(), p.z();
}
Eigen::Index face_idx = 0;
for (auto f : mesh.faces()) {
int vertex_count = 0;
for (auto h : CGAL::halfedges_around_face(mesh.halfedge(f), mesh)) {
auto v = mesh.target(h);
F(face_idx, vertex_count) = v.idx();
++vertex_count;
}
face_idx++;
}
}
template <typename Kernel>
void simple_visualize_mesh(Eigen::MatrixXd& V, Eigen::MatrixXi& F) {
igl::opengl::glfw::Viewer viewer;
viewer.data().set_mesh(V, F);
viewer.launch();
}
// Zero-Copy Map für V (optional)
template <typename Kernel>
Eigen::Map<Eigen::Matrix<double, Eigen::Dynamic, 3, Eigen::RowMajor>>
get_vertex_map(CGAL::Surface_mesh<typename Kernel::Point_3>& mesh) {
auto& points = mesh.points();
double* data = reinterpret_cast<double*>(&points[0][0]);
return {data, static_cast<Eigen::Index>(points.size()), 3};
}
} // namespace