title: Plot and fill 3D volumes in Python
body: <p>I am working with some 3D (volumetric) data using Python, and for every tetrahedron, I have not only the vertices's coordinates but also a fourth dimension which is the value of some parameter for that tetrahedron volume.</p>
  
  <p>For example:</p>
  
  <pre><code># nodes coordinates that defines a tetrahedron volume:
  x = [0.0, 1.0, 0.0, 0.0]
  y = [0.0, 0.0, 1.0, 0.0]
  z = [0.0, 0.0, 0.0, 1.0]
  # Scaler value of the potential for the given volume:
  c = 100.0
  </code></pre>
  
  <p>I would like to plot a 3D volume (given by the nodes coordinates) filled with some solid color, which would represent the given value C.</p>
  
  <p>How could I do that in Python 3.6 using its plotting libraries?</p>