SS
vertices = np.array([
0.5, 0.5, 0.0,
0.5, -0.5, 0.0,
-0.5, -0.5, 0.0,
-0.5, 0.5, 0.0], dtype=np.float32)
indices = np.array([
0, 1, 3,
1, 2, 3], dtype=np.uint32)