<!doctype html>
<html>
  <head>
    <title>threejs cube</title>
    <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
    <meta content="utf-8" http-equiv="encoding">
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r79/three.min.js"></script>
    <script type="text/javascript">
    var scene;
    var camera;
    var renderer;
    var mesh;
    var tick;

    function start() {
      init();
      drawShape();
      render();
    }

    function drawSh