Note
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Clip Volume Widget#
If you have a structured dataset like a pyvista.ImageData
or
pyvista.RectilinearGrid
, you can clip it using the
pyvista.Plotter.add_volume_clip_plane()
widget to better see the internal
structure of the dataset.
Create the Dataset#
Create a dense pyvista.ImageData
with dimensions (200, 200,
200)
and set the active scalars to distance from the center
of the grid.
import numpy as np
import pyvista as pv
grid = pv.ImageData(dimensions=(200, 200, 200))
grid['scalars'] = np.linalg.norm(grid.center - grid.points, axis=1)
grid
Generate the Opacity Array#
Create a banded opacity array such that our dataset shows “rings” at certain values. Have this increase such that higher values (values farther away from the center) are more opaque.
opacity = np.zeros(100)
opacity[::10] = np.geomspace(0.01, 0.75, 10)
Plot a Single Clip Plane Dataset#
Plot the volume with a single clip plane.
Reverse the opacity array such that portions closer to the center are more opaque.
Plot Multiple Clip Planes#
Plot the dataset using the pyvista.Plotter.add_volume_clip_plane()
with
the output from pyvista.Plotter.add_volume()
Enable constant
interaction by setting the interaction_event
to 'always'
.
Disable the arrows to make the plot a bit clearer and flip the opacity array.
pl = pv.Plotter()
vol = pl.add_volume(grid, opacity=opacity)
vol.prop.interpolation_type = 'linear'
pl.add_volume_clip_plane(
vol,
normal='-x',
interaction_event='always',
normal_rotation=False,
)
pl.add_volume_clip_plane(
vol,
normal='-y',
interaction_event='always',
normal_rotation=False,
)
pl.show()
Total running time of the script: (0 minutes 15.698 seconds)