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)

UnstructuredGrid (0x7ab94306ca60)
  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

UnstructuredGrid 1,336,015 points 1,065,589 cells 98.6 MiB

Bounds⧉X [0.000e+00, 2.500e+02]Y [0.000e+00, 2.500e+02]Z [0.000e+00, 1.000e+02]

• Cell Data: (2)
  facies active
  • facies⧉
    scalar
    int64
    [1.000e+00, 4.000e+00]
    active
  • vtkGhostType⧉
    scalar
    uint8
    [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