"""

=====================

plot_trisurf(x, y, z)

=====================

See `~mpl_toolkits.mplot3d.axes3d.Axes3D.plot_trisurf`.

"""

import matplotlib.pyplot as plt

import numpy as np

plt.style.use('_mpl-gallery')

n_radii = 8

n_angles = 36

# Make radii and angles spaces

radii = np.linspace(0.125, 1.0, n_radii)

angles = np.linspace(0, 2*np.pi, n_angles, endpoint=False)[..., np.newaxis]

# Convert polar (radii, angles) coords to cartesian (x, y) coords.

x = np.append(0, (radii*np.cos(angles)).flatten())

y = np.append(0, (radii*np.sin(angles)).flatten())

z = np.sin(-x*y)

# Plot

fig, ax = plt.subplots(subplot_kw={'projection': '3d'})

ax.plot_trisurf(x, y, z, vmin=z.min() * 2, cmap="Blues")

ax.set(xticklabels=[],

yticklabels=[],

zticklabels=[])

plt.show()