Function copyArray

src/components/raycaster.js:457–463

* Copy contents of one array to another without allocating new array.

(a, b)

 * Copy contents of one array to another without allocating new array.
 */
function copyArray (a, b) {
  var i;
  a.length = b.length;
  for (i = 0; i < b.length; i++) {
    a[i] = b[i];
  }
}