normal: [
      -0.333, -0.333, -0.333,
       0.333, -0.333, -0.333,
      -0.333,  0.333, -0.333,
       0.333,  0.333, -0.333,
      -0.333, -0.333,  0.333,
       0.333, -0.333,  0.333,
      -0.333,  0.333,  0.333,
       0.333,  0.333,  0.333,
    ],
    indices: [
       0, 1, 2, 1, 2, 3,
       4, 5, 6, 5, 6, 7,
       0, 2, 4, 4, 2, 6,
       3, 1, 7, 7, 1, 5,
       1, 0, 4, 4, 0, 5,
       2, 3, 6, 6, 3, 7,
    ],
  };
  var sphereBufferInfo = twgl.createBufferInfoFromArrays(gl, sphereVertices);
