title: Two Z axes for 3D plot using matplotlib
body: <p>I'm trying to plot using <code>plot_trisurf</code>, using the following code : </p>
  
  <pre><code>fig = plt.figure()
  ax = fig.gca(projection='3d')
  ax.plot_trisurf(X1,Y1,Z1)
  ax.plot_trisurf(X2,Y2,Z2)
  </code></pre>
  
  <p>The scale of Z1 and Z2 is different by several magnitudes.</p>
  
  <p>How do I share the X and Y axis, but not the Z ? </p>
  
  <p>In 2D I had the function "twinx()", but I can't find a solution for 3D.</p>