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===========================
Animate a 3D wireframe plot
===========================
A very simple "animation" of a 3D plot. See also :doc:`rotate_axes3d_sgskip`.
(This example is skipped when building the documentation gallery because it
intentionally takes a long time to run.)
"""
import time
import matplotlib.pyplot as plt
import numpy as np
fig = plt.figure()
ax = fig.add_subplot(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:
wframe.remove()
# Generate data.
Z = np.cos(2 * np.pi * X + phi) * (1 - np.hypot(X, Y))
# Plot the new wireframe and pause briefly before continuing.
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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