pybindmagic/examples/main.py

import pybindmagic
#%%
%%cpp -f generateMesh
#include <pybind11/eigen.h>
std::tuple<Eigen::MatrixXd,Eigen::MatrixXi> generateMesh()
{
  // Inline mesh of a cube
  const Eigen::MatrixXd V = (Eigen::MatrixXd(8,3)<<
    0.0,0.0,0.0,
    0.0,0.0,1.0,
    0.0,1.0,0.0,
    0.0,1.0,1.0,
    1.0,0.0,0.0,
    1.0,0.0,1.0,
    1.0,1.0,0.0,
    1.0,1.0,1.0).finished();
  const Eigen::MatrixXi F = (Eigen::MatrixXi(12,3)<<
    1,7,5,
    1,3,7,
    1,4,3,
    1,2,4,
    3,8,7,
    3,4,8,
    5,7,8,
    5,8,6,
    1,5,6,
    1,6,2,
    2,6,8,
    2,8,4).finished().array()-1;
    return std::make_tuple(V,F);
}
#%%

V,F = generateMesh()
print("Vertices:\n",V)
print("Faces:\n",F)

#%%
%%cpp
#include <pybind11/eigen.h>


std::tuple<Eigen::MatrixXd,Eigen::MatrixXi> generateMesh()
{
  // Inline mesh of a cube
  const Eigen::MatrixXd V = (Eigen::MatrixXd(8,3)<<
    0.0,0.0,0.0,
    0.0,0.0,1.0,
    0.0,1.0,0.0,
    0.0,1.0,1.0,
    1.0,0.0,0.0,
    1.0,0.0,1.0,
    1.0,1.0,0.0,
    1.0,1.0,1.0).finished();
  const Eigen::MatrixXi F = (Eigen::MatrixXi(12,3)<<
    1,7,5,
    1,3,7,
    1,4,3,
    1,2,4,
    3,8,7,
    3,4,8,
    5,7,8,
    5,8,6,
    1,5,6,
    1,6,2,
    2,6,8,
    2,8,4).finished().array()-1;
    return std::make_tuple(V,F);
}

void printMesh(Eigen::MatrixXd V,Eigen::MatrixXi F)
{
    py::print("Vertices:\n", V);
    py::print("Faces:\n", F);
}

defs
    m.def("generateMesh",&generateMesh);
    m.def("printMesh",&printMesh);
#%%

printMesh(*generateMesh())

#%%
%%cpp -c pathtocmake -f viewMeshh

#include <igl/opengl/glfw/Viewer.h>
#include <pybind11/eigen.h>


void viewMeshh(Eigen::Matrix<double, Eigen::Dynamic, 3> V, Eigen::Matrix<int, Eigen::Dynamic, 3> F)
{
  // Plot the mesh
  igl::opengl::glfw::Viewer viewer;
  viewer.data().set_mesh(V, F);
  viewer.data().set_face_based(true);
  viewer.launch();
}
#%%
import numpy as np

V = np.array([
    [0.0,0.0,0.0],
    [0.0,0.0,1.0],
    [0.0,1.0,0.0],
    [0.0,1.0,1.0],
    [1.0,0.0,0.0],
    [1.0,0.0,1.0],
    [1.0,1.0,0.0],
    [1.0,1.0,1.0]])

F = np.array(
    [
        [1,7,5],
        [1,3,7],
        [1,4,3],
        [1,2,4],
        [3,8,7],
        [3,4,8],
        [5,7,8],
        [5,8,6],
        [1,5,6],
        [1,6,2],
        [2,6,8],
        [2,8,4]
    ], dtype=np.int32)-1

viewMesh(V,F)