title: Matplotlib fill under and between surfaces
body: <p>I managed to make my first graph with matplotlib but now I am stuck. I made a surface graph and I'm trying to figure out two things:</p>
  
  <p>1) how do I fill color (shade) under the surface (between my surface and z=0 plane)?
  2) is it possible to plot second and third surface one over another (and fill spaces between them with some color) - to create '3d stackplot'</p>
  
  <p>My plot:
  <a href="https://i.stack.imgur.com/WDAMX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WDAMX.png" alt="enter image description here"></a></p>