Attached Link: http://www.geocities.com/SiliconValley/2151/bsp.html

And to elaborate, here are details about binary space partitioning (BSP) so that it will make a bit more sense, and take the mysticism out of things... I'm not certain how the "grid" method works in Bryce though. I suppose compared to BSP it merely works off of grid-space instead of binary space?