title: Python Plotting a surface with destinct lines deviation in extra plot
body: <p>sorry for the terrible title, but i can not think of a matching title. My question is, does anybody know a function or good way to great a plot like in the example picture.
  I want to plot a surface and show a the deviation at a specific line (here in orange and green). This was created in Matlab (yet i dont know how).</p>
  <p>I like that a lot since it is creating more information, (especially with more complex surfaces).
  Does anybody has a good idea to implement this (roughly with a sinus wave or something), and not needing endless tricks to get a similar &quot;visibility&quot; of the surface?</p>
  <p>Porbably this already exists, but i dont have the right words to find it.</p>
  <p>thanks a lot :)</p>
  <p><a href="https://i.stack.imgur.com/sZAho.png" rel="nofollow noreferrer">Example of a doctoral thesis on the Internet --&gt; Lines show &quot;cut&quot; in the surface area</a></p>