[vtkusers] Rendering, cannot get rid of hidden edges

[Piotrek Konarski]

Hello

I try to write a python script to plot unstructured grid data. Everything
goes fine except for rendering. VTK renders mesh edges that should be
normally invisible. Those edges disappear when I click on the interactor
window which rotates the plotted object. No matter if I use an interactor,
render a widow or save a screenshot to a file without rendering a window
the result is always the same, the edges are visible. I attach files to
illustrate the problem.

I use VTK 8.1.1 on Fedora linux.

Any ideas?
Regards,
Piotr
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