[vtkusers] VTK rendering 2D mesh

[mafiaskafia]

Hello, so i'm trying to render a 2D mesh using vtk (in python). I have a list
of tuples containing all the points and also a list of tuples containing the
points of each cell. Just to experiment, I tried to create a polydata object
of a square with 4 elements and render it, but i ended up with this: 

<http://vtk.1045678.n5.nabble.com/file/t342418/helpp.png> 

I would like it to show the lines connecting the nodes (like a wireframe)
instead of solid square..
This is the code to produce the image above:  code example
<https://pastebin.com/uik9uDQk>  

I would also like to know if it's possible to have a gridline as the
background of the render window, instead of a black color, just like this:

<http://vtk.1045678.n5.nabble.com/file/t342418/helpaa.png> 







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