Plot Over Line

Plot the values of a dataset over a line through that dataset

# sphinx_gallery_thumbnail_number = 2
import pyvista as pv
from pyvista import examples

Volumetric Mesh

First a 3D mesh example to demonstrate

mesh = examples.download_kitchen()

# Make two points to construct the line between
a = [mesh.bounds[0], mesh.bounds[2], mesh.bounds[4]]
b = [mesh.bounds[1], mesh.bounds[3], mesh.bounds[5]]

# Preview how this line intersects this mesh
line = pv.Line(a, b)

p = pv.Plotter()
p.add_mesh(mesh, style="wireframe", color="w")
p.add_mesh(line, color="b")
p.show()

Out:

[(13.478563426690005, 12.478563426690005, 11.228563426690005),
 (3.50499999942258, 2.50499999942258, 1.25499999942258),
 (0.0, 0.0, 1.0)]

Run the filter and produce a line plot

mesh.plot_over_line(a, b, resolution=100)

Out:

/home/travis/build/pyvista/pyvista/pyvista/core/filters.py:1707: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
  return plt.show()

Flat Surface

We could also plot the values of a mesh that lies on a flat surface

mesh = examples.download_st_helens()

# Make two points to construct the line between
a = [mesh.center[0], mesh.bounds[2], mesh.bounds[5]]
b = [mesh.center[0], mesh.bounds[3], mesh.bounds[5]]

# Preview how this line intersects this mesh
line = pv.Line(a, b)

p = pv.Plotter()
p.add_mesh(mesh)
p.add_mesh(line, color="white", line_width=10)
p.add_point_labels(
    [a, b], ["A", "B"], font_size=48, point_color="red", text_color="red"
)
p.show()

Out:

[(581864.4350162606, 5134010.9350162605, 19711.435016260606),
 (562835.0, 5114981.5, 682.0),
 (0.0, 0.0, 1.0)]

Run the filter and produce a line plot

mesh.plot_over_line(
    a,
    b,
    resolution=10000,
    title="Elevation Profile",
    ylabel="Height above sea level",
    figsize=(10, 5),
)

Out:

/home/travis/build/pyvista/pyvista/pyvista/core/filters.py:1707: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
  return plt.show()