lessons/webgl-boilerplate.html
and https://webgl2fundamentals.org/webgl/lessons/webgl-resizing-the-canvas.html
for webgl-utils, m3, m4, and webgl-lessons-ui.
-->
<script src="../../resources/webgl-utils.js"></script>
<script src="../../resources/lessons-helper.js"></script> <!-- you can delete this script. it is only used on the site to help with errors -->
<script src="m4.js"></script>
<script>
"use strict";

var m = ThreeDMath;
window.onload = main;

function main() {
  var cubeVertices = [
    -1, -1, -1