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Table of Glyphs#
vtk
supports tables of glyphs from which glyphs are looked
up. This example demonstrates this functionality.
from __future__ import annotations
import numpy as np
import pyvista as pv
We can allow tables of glyphs in a backward-compatible way by
allowing a sequence of geometries as well as single (scalar)
geometries to be passed as the geom
kwarg of pyvista.DataSetFilters.glyph()
.
An indices
optional keyword specifies the index of each glyph geometry in
the table, and it has to be the same length as geom
if specified. If it is
absent a default value of range(len(geom))
is assumed.
# get dataset for the glyphs: supertoroids in xy plane
# use N random kinds of toroids over a mesh with 27 points
N = 5
values = np.arange(N) # values for scalars to look up glyphs by
# taken from:
# rng = np.random.default_rng()
# params = rng.uniform(0.5, 2, size=(N, 2)) # (n1, n2) parameters for the toroids
params = np.array(
[
[1.56821334, 0.99649769],
[1.08247844, 1.83758874],
[1.49598881, 0.83495047],
[1.52442129, 0.89600688],
[1.92212387, 0.78096621],
],
)
geoms = [pv.ParametricSuperToroid(n1=n1, n2=n2) for n1, n2 in params]
# get dataset where to put glyphs
x, y, z = np.mgrid[:3.0, :3.0, :3.0]
mesh = pv.StructuredGrid(x, y, z)
# add random scalars
# rng_int = rng.integers(0, N, size=x.size)
rng_int = np.array(
[4, 1, 2, 0, 4, 0, 1, 4, 3, 1, 1, 3, 3, 4, 3, 4, 4, 3, 3, 2, 2, 1, 1, 1, 2, 0, 3],
)
mesh.point_data['scalars'] = rng_int
# construct the glyphs on top of the mesh; don't scale by scalars now
glyphs = mesh.glyph(geom=geoms, indices=values, scale=False, factor=0.3, rng=(0, N - 1))
# create plotter and add our glyphs with some nontrivial lighting
plotter = pv.Plotter()
plotter.add_mesh(glyphs, specular=1, specular_power=15, smooth_shading=True, show_scalar_bar=False)
plotter.show()
/home/runner/work/pyvista/pyvista/pyvista/core/filters/data_set.py:2692: UserWarning: No vector-like data to use for orient. orient will be set to False.
warnings.warn('No vector-like data to use for orient. orient will be set to False.')
Total running time of the script: (0 minutes 4.005 seconds)