0, 0, 0.125, 1
0.125, 0, 0.25, 1
0.25, 0, 0.375, 1
0.375, 0, 0.5, 1
0.5, 0, 0.625, 1
0.625, 0, 0.75, 1
0.75, 0, 0.875, 1
0.875, 0, 1, 1