Hide Cells with Ghosting

Specify specific cells to hide when plotting.

This is a lightweight alternative to thresholding to quickly hide cells in a mesh without creating a new mesh.

Notably, the mesh must be cast to an pyvista.UnstructuredGrid type for this to work (use the cast_to_unstructured_grid filter).

from __future__ import annotations

import numpy as np

from pyvista import examples

vol = examples.load_channels()
mesh = vol.cast_to_unstructured_grid()

Decide which cells are ghosted with a criteria (feel free to adjust this or manually create this array to hide specific cells).

ghosts = np.argwhere(mesh['facies'] < 1.0)

# This will act on the mesh inplace to mark those cell indices as ghosts
mesh.remove_cells(ghosts, inplace=True)

Header	Data Arrays
UnstructuredGrid Information N Cells 1065589 N Points 1336015 X Bounds 0.000e+00, 2.500e+02 Y Bounds 0.000e+00, 2.500e+02 Z Bounds 0.000e+00, 1.000e+02 N Arrays 2	Name Field Type N Comp Min Max facies Cells int64 1 1.000e+00 4.000e+00 vtkGhostType Cells uint8 1 0.000e+00 0.000e+00

Now we can plot the mesh and those cells will be hidden

mesh.plot(clim=[0, 4])

Static Scene

Interactive Scene

Tags: plot