[vtkusers] Contourf 2D plot using VTK primitives

[Ruben Di Battista]

Hello,

I’m collecting statistics from a vtkPolyData, they’re bi-variate pdfs, and
I would like to plot them in a 2D contour plot.

I would like to avoid to add additional dependencies in the project (as
matplotlib-cpp for example) if possible… Is it possible to achieve
something similar to the matplotlib contourf
<https://matplotlib.org/gallery/images_contours_and_fields/contour_corner_mask.html#sphx-glr-gallery-images-contours-and-fields-contour-corner-mask-py>
method
in VTK?

So what I would like to achieve is a filter that takes tabular data in
input and renders them in a 2D `contourf` plot.

Thanks in advance,

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