Context sharing between C/C++ and Python

Support
1

Dear All,

Suppose that I displayed a 3D image with VTK in Python and I want to manipulate it with C/C++ (Rotate, pick a point etc). How I share VTK context between C/C++ and Python?

Thanks,

Luís Gonçalves

2

Assuming that the Python interpreter is embedded in your running C++ process, and thus shares the same address space, you can use the “_this_” attribute to get the address (in hexadecimal) of a wrapped vtkObject:

>>> window = vtk.vtkRenderWindow()
>>> window.__this__
'_000055ab9b5b50f0_p_vtkXOpenGLRenderWindow'

The format is “_” + address + “_p_” + type, where the “p” simply signifies “pointer”.

Another approach, from the C++ end, is to use the Python wrapper API:

vtkObjectBase* vtkPythonUtil::GetPointerFromObject(PyObject* obj, const char* obj_type)
3

There is some way to call a C/C++ program from Python (Paraview Python) with share of the variable space? (another way than system call)

Are the following approaches valid for Paraview Python?

4

This is a large and complicated topic. You’re best bet is to read and experiment with different possible solutions.

5

Cython is not supported in Paraview Python. Also not cffi.

6

Ctypes works and with CUDA.