I believe what you are talking about is the LOD (level of detail) distance. You can adust the distance the game renders objects and vegetation at by modifying the settings in the VideoDefault.con file.
Ex: C:\Program Files (x86)\EA GAMES\Battlefield 1942\Mods\bf1942\Settings\VideoDefault.con
This website might help you: Tweaktown.com
LuccaWulf
joined
HelloClan Helper HTroop Co-Leader Member @ bfmods.com Member @ is82.com Member @ htroop.mricesoulutions.com Member @ Moongamers YouTube: LuccaWulf