title: How to fill mplot3d bar plot depth? [Python 3.x]
body: <p>There is an example for how to build a bar plot at the bottom of this question taken from the matplotlib site. </p>
  
  <p>I cannot find a parameter to increase the depth of each bar. I want depth to give it a 3d look like <a href="http://i.stack.imgur.com/Vw9G7.png" rel="nofollow">this picture.</a></p>
  
  <p>Is there a function parameter to change this that I'm not seeing, or will I need to use a different 3D bar plot function?</p>
  
  <p>Below is the bar plot code from the first link in case someone can't see it:</p>
  
  <pre><code>from mpl_toolkits.mplot3d import Axes3D
  import matplotlib.pyplot as plt
  import numpy as np
  
  fig = plt.figure()
  ax = fig.add_subplot(111, projection='3d')
  for c, z in zip(['r', 'g', 'b', 'y'], [30, 20, 10, 0]):
      xs = np.arange(20)
      ys = np.random.rand(20)
  
      # You can provide either a single color or an array. To demonstrate this,
      # the first bar of each set will be colored cyan.
      cs = [c] * len(xs)
      cs[0] = 'c'
      ax.bar(xs, ys, zs=z, zdir='y', color=cs, alpha=0.8)
  
  ax.set_xlabel('X')
  ax.set_ylabel('Y')
  ax.set_zlabel('Z')
  
  plt.show()
  </code></pre>
  
  <p>I've found <a href="https://toeholds.wordpress.com/2010/03/26/3d-bar-histogram-in-python/" rel="nofollow">this link to a solution</a> but this solution doesn't actually increase the depth. I'm hoping for a method to completely fill the depth if possible. </p>