   0, -1, 0,

          // left side
          -1, 0, 0,
          -1, 0, 0,
          -1, 0, 0,
          -1, 0, 0,
          -1, 0, 0,
          -1, 0, 0,
      ]);
  gl.bufferData(gl.ARRAY_BUFFER, normals, gl.STATIC_DRAW);
}

main();
</script>
</html>

