The grassbink.exe file you have requested: Mods / Multiplayer / Battle Grounds / -Releases / Promos, Videos, Trailers / Battle Grounds promo vid #3 (Grass rendering system) - 12.17mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:
Grass rendering systemThis video (BINK format) shows a grass entity that mappers can add. The grass itself is particle engine powered and supports things like level of detail or wind.