Shave and a Haircut hair grooming, dynamics, and rendering system has been updated. New features include an attribute painting mode that can paint weights on almost any hair attribute (including color, shaping, density and dynamics), the ability to comb hair on lower res cages with the hair following the highres surfaces when further tesselated and a polygonal render capable of rendering billions of polygons with a few megabytes of RAM (it discards polygons from RAM after rendering them).
A demo version is available for download. Note: This is not a plugin for Max and is currently only available to Max users that use a Renderman-compatible renderer for output.