[Feature]

[MarkusZimmerDLR]

Feature Request

Dear vtk-folks,

This issue already developed in December, yet between the year it went under my radar.

Particular aspect have been already discussed in the help channels of the pyvista repo.
Basically, it would be nice having categorical labelling also available in vtk.js.

Thanks!
Cheers,
Markus

Discussed in pyvista/pyvista#5249

^{Originally posted by MarkusZimmerDLR November 30, 2023}
Dear pyvista folks,

I am currently struggling with the trame export of pyvista plotters.

More specifically, I am trying to mark and label specific parts of the mesh, either using labels and legends, or labelled axes and cell data.

Legends are lost after html export. Axes labels are converted to integers.
Any idea on how to generate a categorial labelling.

Thanks!

Quick example of the issue:

import pyvista as pv
import numpy as np
s = pv.Sphere()
a = np.arange(s.n_cells, dtype=object)
a[:s.n_cells//2] = 'spam'
a[s.n_cells//2:] = 'egg'
s.cell_data['test'] = a
p = pv.Plotter()
p.add_mesh(s, scalars='test')
p.export_html('test.html')
p.screenshot('test.png')

Result for the png:

Result for html (converted to png for upload):

Motivation and Detailed Description

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