how to construct py::object from MyClass* while MyClass binding is not using pybind11

[qingfengxia]

vtk is a C++ lib, it has python binding, but it is not written by pybind11. Here I have vtk c++ header, but no access to vtk' python binding code/headers.

In C++ side, I have MyClass as vtkClassname, in python I can use the bindiing like vtk.vtkClassname, without writing pybind11 binding class, is that possible to write code like this below?

PyObject* getPyObject() {
  // assuming  vtkClassName* vtkInstancePtr has been allocated in heap;
  auto m = py::module_::import("vtk");
  py::object o = m.attr("vtkClassName")(vtkInstancePtr);  // not sure if this works? 
  // if construct py::obejct is not possible 
  //  py::class_<vtkClassName>  binding is needed before this function, then:   py::object o  =  py::cast(cls);
  return o;
}

is that possbile to add code into pybind11.h, in order to do something like this?

Thank you very much

qingfeng

[qingfengxia]

https://stackoverflow.com/questions/54871216/pybind11-return-c-class-with-an-existing-python-binding-to-python
I find some vtk specific solution, by make pybind_vtk.