title: Image overlay in 3d plot using python
body: <p>I have a 3d plot of lines generated by matplotlib. I want to overlay an image at a specific xy (or yz, xz) slice. How do I do that using python? Thanks.</p>
  
  <p>I have a simple 3d plot code as:</p>
  
  <pre><code>fig = plt.figure(1),&lt;br&gt;
  ax = Axes3D(fig)&lt;br&gt;
  ax.plot(f[:,0], f[:,1], f[:,2], color='r')
  </code></pre>
  
  <p>I also have an image "Im" (a 2d array), so I need something like:</p>
  
  <pre><code>ax.overlay(Im, slice='xy', sliceNo=10)
  </code></pre>