title: How to do 3D bar plot in R
body: <p>I would like to produce this kind of graph:</p>
  
  <p><img src="https://i.stack.imgur.com/GcKBS.png" alt="3D bar plot"></p>
  
  <p>However, I don't know how to do it using R. I was wondering if someone knew a solution to do it in R?</p>