title: Python matplotlib wireframe distortion
body: <p>I am trying to create a plot composed of multiple wireframe spheres using matplotlib. I found a code fragment to plot one such sphere <a href="https://stackoverflow.com/questions/11140163/python-matplotlib-plotting-a-3d-cube-a-sphere-and-a-vector">here</a> so I thought it would be easy to extend it to multiple spheres by just calling plot_wireframe multiple times. I was wrong. Here's a code fragment: </p>
  
  <pre><code>import matplotlib.pyplot as plt
  import numpy as np
  from mpl_toolkits.mplot3d import Axes3D
  u, v = np.mgrid[0:2*np.pi:20j, 0:np.pi:10j]
  x=np.cos(u)*np.sin(v)
  y=np.sin(u)*np.sin(v)
  z=np.cos(v)
  fig = plt.figure(figsize=(8,6))
  ax = fig.gca(projection='3d')
  ax.plot_wireframe(x*3.+5., y*3., z*3.,linewidths=.2)
  ax.view_init(azim=30,elev=40)
  ax.set_aspect("equal")
  plt.show()
  fig = plt.figure(figsize=(8,6))
  ax = fig.gca(projection='3d')
  ax.plot_wireframe(x*3.+5., y*3., z*3.,linewidths=.2)
  spheres = [ [0,0,0,1], [3,0,0,1.6] ]
  for v in spheres:
      ax.plot_wireframe(x*v[3]+v[0], y*v[3]+v[1], z*v[3]+v[2],linewidths=.2)
  ax.view_init(azim=30,elev=40)
  ax.set_aspect("equal")
  plt.show()
  </code></pre>
  
  <p>If you run that code, the first plot will show a nice sphere, while in the second all the spheres are distorted and shifted. I searched to make sure plot_wireframe can be called multiple time on the same axis but couldn't find anything. Also, I'm a Python noob, but I don't think I'm doing anything wrong.
  Thank you for the help!</p>