from __future__ import print_function

"""

A very simple 'animation' of a 3D plot

"""

from mpl_toolkits.mplot3d import axes3d

import matplotlib.pyplot as plt

import numpy as np

import time

def generate(X, Y, phi):

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

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

plt.ion()

fig = plt.figure()

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

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

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

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

Z = generate(X, Y, 0.0)

wframe = None

tstart = time.time()

for phi in np.linspace(0, 360 / 2 / np.pi, 100):

oldcol = wframe

Z = generate(X, Y, phi)

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

# Remove old line collection before drawing

if oldcol is not None:

ax.collections.remove(oldcol)

plt.draw()

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