Viskex available options, saving screenshot - labeling meshtags

General
1

I am using viskex to plot my mesh and was wondering what options are available. First of all, viskex makes plotting mesh tags much easier than using PyVista natively. However, I am unclear how to do what PyVista supports such as:

  • saving screenshot of visualization
  • labeling points in certain region for example adding a label to center of mass of a given mesh tag
2

Hi @leshinka,
thanks for your interest in viskex.

The tutorials show the usage of viskex.dolfinx.plot_* functions. Those functions create a pyvista plotter, and automatically call show() on it.

If you would like to postprocess the plotter in any way, then use the internal viskex.DolfinxPlotter.plot_mesh(mesh). This returns a pyvista plotter, but does not call show() on it, hence you can process it any way you want.

Small snippet

# assuming the mesh is defined beforehand
# assuming each line of code to be in a separate cell of the notebook

# Cell 1
output1 = viskex.dolfinx.plot_mesh(mesh)
# show the trame widget

# Cell 2
type(output1)
# prints NoneType

# Cell 3
output2 = viskex.DolfinxPlotter.plot_mesh(mesh)
# no trame widget is displayed

# Cell 4
type(output2)
# prints pyvista.plotting.plotter.Plotter
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3

This solves my problem. Is there a way to visualize a scalar field obtained from reading an adios2 file obtained in fenicsx?

4

Once you read it in in dolfinx.fem.Function, you will be able to plot it regardless of where the actual data store in the function comes from.

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