Manual field line seeds

How to interactively choose field line seed points using the mouse.

First, load the required modules.

from psipy.data import sample_data
from psipy.model import MASOutput
from psipy.visualization.pyvista import PyvistaPlotter

Load a set of MAS output files.

mas_path = sample_data.mas_sample_data()
model = MASOutput(mas_path)

To visualise the result create a pyvista plotter window. To interactively trace field lines, we then create a sphere to trace the field lines from.

Once the window pops up, you can place your mouse over somewhere on the sphere and click “p” to trace a field line from that point.

Note that we’ve used the second r coordinate in the model to trace the field lines from. Choosing the first coordinate (the inner boundary of the model) will lead to surprising edge effects.

plotter = PyvistaPlotter(model)
plotter.add_tracing_seed_sphere(model["br"].r_coords[1])
plotter.show()