问Openmesh:用Python更新脸法线比用C++更新更快？

EN

#include <string>
#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>

struct MyTraits : OpenMesh::DefaultTraits{
     typedef OpenMesh::Vec3d Point;
     typedef OpenMesh::Vec3d Normal;
};

typedef OpenMesh::TriMesh_ArrayKernelT<MyTraits>  MyMesh;

int main(int argc, char *argv[]){
    std::string filename = "filename.stl";    
    MyMesh OM_mesh;

    OM_mesh.request_face_normals();
    OM_mesh.request_halfedge_normals();
    OM_mesh.request_vertex_normals();
    OM_mesh.request_face_status();
    OM_mesh.request_edge_status();
    OM_mesh.request_halfedge_status();
    OM_mesh.request_vertex_status();

    OpenMesh::IO::Options ropt;
    ropt += OpenMesh::IO::Options::Binary;
    ropt += OpenMesh::IO::Options::FaceNormal;

    OpenMesh::IO::read_mesh(OM_mesh, filename);

    for(int k=0; k<1000; k++){
        OM_mesh.update_face_normals();
    }

    return 0;
}

import openmesh as OM
filename = "filename.stl"
OM_mesh = OM.TriMesh()

OM_mesh.request_face_normals()
OM_mesh.request_halfedge_normals()
OM_mesh.request_vertex_normals()
OM_mesh.request_face_status()
OM_mesh.request_edge_status()
OM_mesh.request_halfedge_status()
OM_mesh.request_vertex_status()

options = OM.Options()
options += OM.Options.Binary
options += OM.Options.FaceNormal

OM.read_mesh(OM_mesh, filename, options)
for k in range(1000):
    OM_mesh.update_face_normals()