For the width, height, and depth parameters, the pixel dimensions of subsequent levels are the truncated value of half of the previous level's pixel dimension (independently). Each dimension clamps at a size of 1 pixel. Thus, if the division by 2 results in 0 (zero), 1 is taken instead. The maximum dimension that a driver supports (for width, height, and depth) can be found in Caps.MaxVolumeExtent.