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"""

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

Rotating 3D wireframe plot

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

A very simple 'animation' of a 3D plot. See also rotate_axes3d_demo.

(This example is skipped when building the documentation gallery because it

intentionally takes a long time to run)

"""

import matplotlib.pyplot as plt

import numpy as np

import time

def generate(X, Y, phi):

'''

Generates Z data for the points in the X, Y meshgrid and parameter phi.

'''

R = 1 - np.sqrt(X**2 + Y**2)

return np.cos(2 * np.pi * X + phi) * R

fig = plt.figure()

ax = fig.add_subplot(111, projection='3d')

# Make the X, Y meshgrid.

xs = np.linspace(-1, 1, 50)

ys = np.linspace(-1, 1, 50)

X, Y = np.meshgrid(xs, ys)

# Set the z axis limits so they aren't recalculated each frame.

ax.set_zlim(-1, 1)

# Begin plotting.

wframe = None

tstart = time.time()

for phi in np.linspace(0, 180. / np.pi, 100):

# If a line collection is already remove it before drawing.

if wframe:

ax.collections.remove(wframe)

# Plot the new wireframe and pause briefly before continuing.

Z = generate(X, Y, phi)

wframe = ax.plot_wireframe(X, Y, Z, rstride=2, cstride=2)

plt.pause(.001)

print('Average FPS: %f' % (100 / (time.time() - tstart)))

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