title: Adding a 4th variable to a 3D plot in Python
body: <p>I have 3 different parameters X,Y and Z over a range of values, and for each combination of these a certain value of V. To make it clearer, the data would look something like this. </p>
  
  <pre><code>X  Y  Z  V
  1  1  2  10
  1  2  3  15
  etc...
  </code></pre>
  
  <p>I'd like to visualize the data with a surface/contour plot, using V as a colour to see its value at that point, but I do not see how to add my custom colouring scheme into the mix using Python. Any idea on how to do this (or is this visualization outright silly)?</p>
  
  <p>Thanks a lot!</p>