title: how can i make drawScene plot variable in R?
body: <p><img src="https://i.stack.imgur.com/4sCwg.png" alt="enter image description here" /></p>
  <p>I can't understand that colored lines.
  what is local function in R?</p>
  <p>and what does 7 , 20, 20 mean? does that mean grid?</p>
  <p>and what does surfaceTriangles mean?</p>
  <p>I just can't understand all about that...</p>