Problems converting external data into a .vtk file

[Railon69]

Dear Madam or Sir,

I am using meshio to convert node and element information from another program into a .vtk file for further use. I am stuck at the very last point, i.e. the file generation.

My code is the following:

    import os
    import meshio
    import numpy as np
    
    os.chdir("workingdirectory")
    
    # Node information
    points = node_coords
    points = points.tolist()
    
    # Element information
    
    # 1. Quad Mesh
    ele_vi = np.asarray(ele[:,1:5]).ravel()
    ele_vi = ele_vi.tolist()
    n_b = 4                                     # Block size
    ele_vl = []
    for i in range(0, len(ele_vi)):
        ele_vl.append(ele_vi[i:i+n_b])
    
    
    # Initialize the cells list with the first entry as "quad"
    cells = [("quad", ele_vl)]
    #print(cells)
    
    # Generate Mesh
    mesh = meshio.Mesh(points, cells)

The following manipulation is done:

1. Variable node_coords (array of float integers size n x 3) --> Conversion to variable points (type: list)
2. Element information extraction, resulting in ele_vl (resulting in a list variable)

The entire procedure follows exactly the example on: https://libraries.io/pypi/meshio

The example on the website works perfectly well. My script drops out the following error:

C:path\Python\Python310\site-packages\meshio_mesh.py:150: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray.
data if cell_type.startswith("polyhedron") else np.asarray(data),
Traceback (most recent call last):

File C:\ProgramData\anaconda3\lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec
exec(code, globals, locals)

File c:\path.spyder-py3\main.py:20
mesh_file_gen(wdir, node_coords, ele)

File ~.spyder-py3\mesh_file_gen.py:40 in mesh_file_gen
mesh.write("foo2.vtk")

File ~\path\Python\Python310\site-packages\meshio_mesh.py:241 in write
write(path_or_buf, self, file_format, **kwargs)

File ~\path\Python\Python310\site-packages\meshio_helpers.py:177 in write
if value.shape[1] != num_nodes_per_cell[key]:

IndexError: tuple index out of range

Can anyone help me figuring out the root cause or even fix this problem. Every help will be really much appreciated!

[Railon69]

Nvm, the problem was from my side!