d data
    var dataComplete = new Float32Array([0, 0, 0, 1,
                                         0, 0, 1,
                                         1, 0, 0, 1,
                                         0, 0, 1,
                                         1, 1, 1, 1,
                                         0, 0, 1]);
    var dataIncomplete = new Float32Array([0, 0, 0, 1,
                                           0, 0, 1,
                                           1, 0, 0, 1,
                                