Techniques, systems, arrangements, and computer program products are operable in computer graphics systems to make shadow volumes more general with respect to the meshes that can serve as occluding geometry in such computer graphics systems, as well as for accelerating shadow volume techniques, particularly for large and complex input scenes. The solar array has a plurality of solar modules, each module having at least one DCDC converter for converting the raw panel output to an optimized high voltage, low current output. The retainer member is enclosed in a tubular member or sleeve to prevent breaking of the retainer member during formation of the opening in the bone. The container may include a tool pouch defined on four sides by the sealed region and containing a spreading tool.