Download and Plot Examples

Note

This is the solution to Download and Plot Examples. If you haven’t already tried to solve it on your own, you probably should try that first.

Download and plot example datasets.

PyVista contains many downloadable datasets documented at pyvista.examples.downloads. You can download these through Python and then immediately plot them.

This is an easy way to immediately get started with example datasets within PyVista without having to manually download and load them.

Import PyVista and the examples module

import pyvista as pv
from pyvista import examples

Surface DataSet - Download

Download a surface dataset of pine roots. Note how the dataset is automatically loaded right into Python.

dataset = examples.download_pine_roots()
dataset

Header	Data Arrays
PolyData Information N Cells 351536 N Points 178091 N Strips 0 X Bounds 2.742e+00, 7.847e+01 Y Bounds 0.000e+00, 7.969e+01 Z Bounds 0.000e+00, 9.961e+01 N Arrays 1	Name Field Type N Comp Min Max Unnamed_0 Points float32 3 -1.000e+00 1.000e+00

Surface DataSet - Plot

Plot the pine roots using PyVista’s default plotting settings.

dataset.plot()

Static Scene

Interactive Scene

Volume DataSet - Download

Download the bolt dataset. This is an excellent dataset to visualize using “volumetric” plotting.

dataset = examples.download_bolt_nut()
dataset

Information	Blocks
MultiBlock Values N Blocks 2 X Bounds 0.000, 69.000 Y Bounds 0.000, 122.000 Z Bounds 0.000, 65.000	Index Name Type 0 bolt ImageData 1 nut ImageData

Volume DataSet - Plot

Here, we plot the dataset using a custom view direction using pyvista.Plotter.

pl = pv.Plotter()
_ = pl.add_volume(
    dataset,
    cmap="coolwarm",
    opacity="sigmoid_5",
    show_scalar_bar=False,
)
pl.camera_position = [(194.6, -141.8, 182.0), (34.5, 61.0, 32.5), (-0.229, 0.45, 0.86)]
pl.show()

Static Scene

Interactive Scene

Exercise #1 - Use PyVista Examples

Visualize one of PyVista’s built in examples.

If your IDE supports it, you should be able to type dataset = examples.download_ and press tab to see all the available examples you can download.

dataset = examples.download_gears()
bodies = dataset.split_bodies()
bodies.plot(
    cmap="jet",
    multi_colors=True,
    smooth_shading=True,
    split_sharp_edges=True,
)

Static Scene

Interactive Scene

Exercise #2 - Download and View a File

Experiment on your own by downloading a dataset and reading it in with pyvista.read. You can use one of your own files or try downloading one from the following sources:

• Sample VTK DataSets

• Sample STL files

• Thingiverse

Solution Download the file 'P_shelf_pin.stl' from https://www.thingiverse.com/thing:5412753

mesh = pv.read("P_shelf_pin.stl")
mesh.plot()

Static Scene

Interactive Scene